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Converters: RS232 to RS422 / RS485 I-Loop / Fibre Optic / Isolator

JED - ATEN - AIC - ADAM Converters

Converters: RS232 to RS422 / RS485

RS485 is a two wire (twisted pair) network used for party lines where several RS485 devices are attached to the same line in daisy chain style (effectively in parallel). The RS485 lines can theoretically extend for 1.2km. Only one device can be in transmit mode at a particular time, so the remainder must be in receive mode. Up to 32 devices can be attached to an RS485 line without a Repeater. Some means is required to turn on the transmit mode in a device prior to sending.

RS485 termination: The extreme ends of the RS485 line should be terminated with a 120 ohm resistor (i.e. 2 only). RS485 networks should not use a “star” configuration with unterminated stubs. Stations should be close to or on the line. This will prevent reflections causing problems at high speeds. JED converters have link selectable termination resistors. ADAM converters have a positions for terminating resistors.

RS485/RS422 Receiver Biasing: the receiver can be fed with a small bias current which applies the space condition if the line is broken or not actively driven. The RS232 send line is then in the space or stop condition also (-ve). JED Converters have a link for setting this.

RS422 has separate dedicated pairs of wires for each direction of transmission between only two devices up to 1.2km apart.
Usually there are just two pairs (send & receive), so data flow must be controlled by XON & XOFF codes. Hardware handshake would require a third and maybe a fourth pair.

DTE: Data Terminal Equipment, e.g. a PC: the transmit pin is pin 2 on a DB25 connector, or pin 3 on a DB9 connector.
DCE: Data Communications Equipment, e.g. a modem:  the transmit pin is pin 3 on a DB25 connector, or pin 2 on a DB9 connector.

If the RS422/485 side of a converter is sending signals to a distant location, an isolated converter is recommended.
This avoids ground loops which can cause data errors if the ground potentials are different at each end of the long line, and gives more tolerance to electrical interference.

ADAM Converters – Advantech

ADAM-4520 Isolated RS-232 to RS-422/485 Converter


RS232 to RS422/485 Converter Module, supports up to 32 Adam Modules on RS485 (2-wire) or RS422 (4-wire). Up to 115Kbps. RTS handshake.
ADAM-4520
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ADAM-4520

Most industrial computer systems come with standard RS-232 serial ports. Though widely accepted, RS-232 has limited transmission speed, range, and networking capabilities. The RS-422 and RS-485 standards overcome these limitations by using differential voltage lines for data and control signals. The ADAM-4520/4522 converter lets you take advantage of RS-422 and RS-485 on systems originally equipped with RS-232. It transparently converts RS-232 signals into isolated RS-422 or RS-485 signals. You do not need to change your PC’s hardware or your software. The ADAM-4520 lets you easily build an industrial grade, long distance communication system with standard PC hardware. It extends the communication distance by 4000 ft. (1200 m) or increases the maximum number of connected nodes by 32.

Features:

  • Automatic RS-485 data flow control
  • 3000 VDC isolation protection
  • Surge protection RS-485 data line
  • Transmission speed up to 115.2 Kbps
  • Networking up to 1200 meters (4000 feet)
  • Reserved space for termination resistors
  • Power and data flow indicator for troubleshooting
  • Power requirement: +10 to +30 VDC
  • Mounts easily on a DIN-rail, panel or piggyback

Specifications:

Category Attribute Value
Display LED Indicators Comm
Power Supply Power Requirement 10~30 VDC
General Comm. Distance RS-422/485: 1.2 km RS-232: 15 m
Communication Speed Serial: From 1,200 to 115.2 k
Connector RS-232: female DB9
RS-422/485: plug-in screw terminal
Data Flow Control Yes
Humidity 5 ~ 95% RH
Interface RS-232 to RS-422/485
Isolation Protection 3,000 VDC
Temperature (Operating) -10 ~ 70° C (14 ~ 158° F)
Temperature (Storage) -25 ~ 85° C (-13 ~ 185° F)

Datasheet on ADAM-4520 (pdf, opens in a new tab)

ADAM-4510 RS-422/485 Repeater


The ADAM-4510 repeaters simply amplify, or boost, existing RS-485 signals to enable them to cover longer distances. They extend the communication distance by 4000 ft (1200 m) or extend the number of connected nodes by 32.
ADAM-4510
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ADAM-4510

Features:

  • Automatic RS-485 data flow control
  • Surge protection RS-485 data line
  • Transmission speed up to 115.2 Kbps
  • Networking up to 1200 meters (4000 feet)
  • Reserved space for termination resistors
  • Power and data flow indicator for troubleshooting
  • Power requirement: +10 to +30 VDC
  • Mounts easily on a DIN-rail, panel or piggyback

Specifications:

Category Attribute Value
Display LED Indicators Comm
Power Supply Power Requirement 10~30 VDC
General Comm. Distance Serial: 1.2 km
Communication Speed Serial: From 1,200 to 115.2 k
Connector RS-422/485: plug-in screw terminal
Data Flow Control Yes
Humidity 5~95 %RH
Interface RS-422 RS-485
Isolation Protection 3,000 VDC
Temperature (Operating) -10~70 °C (14~158 °F)
Temperature (Storage) -25~85 °C (-13~185 °F)

Datasheet on ADAM-4510 (pdf, opens in a new tab)

ADAM-4510S Isolated RS-422/485 Repeater


Most industrial computer systems come with standard RS-232 serial ports. Though widely accepted, RS-232 has limited transmission speed, range, and networking capabilities. The RS-422 and RS-485 standards overcome these limitations by using differential voltage lines for data and control signals.
ADAM-4510S
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ADAM-4510S

Features:

  • Automatic RS-485 data fl ow control
  • 3000 VDC isolation protection
  • Surge protection RS-485 data line
  • Transmission speed up to 115.2 Kbps
  • Networking up to 1200 meters (4000 feet)
  • Reserved space for termination resistors
  • Power and data fl ow indicator for troubleshooting
  • Power requirement: +10 to +30 VDC
  • Mounts easily on a DIN-rail, panel or piggyback

Specifications:

Category Attribute Value
Display LED Indicators Comm
Power Supply Power Requirement 10~30 VDC
General Comm. Distance Serial: 1.2 km
Communication Speed Serial: From 1,200 to 115.2 k
Connector RS-422/485: plug-in screw terminal
Data Flow Control Yes
Humidity 5~95 %RH
Interface RS-422 RS-485
Temperature (Operating) -10~70 °C (14~158 °F)
Temperature (Storage) -25~85 °C (-13~185 °F)

Datasheet on ADAM-4510S (pdf, opens in a new tab)

ADAM-4521 Addressable RS-422/485 to RS-232 Converter


The ADAM-4521 is an intelligent RS-422/485 to RS-232 converter specifically designed to connect RS-422/485 devices to an RS-232 network. RS-232 is the most common transmission standard.
ADAM-4521
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ADAM-4521

The ADAM-4521 is an intelligent RS-422/485 to RS-232 converter specifically designed to connect RS-422/485 devices to an RS-232 network. RS-232 is the most common transmission standard. Although widely available on most computer systems, measurement equipment, PLCs, and industrial devices, its transmission speed, communication distance, and especially networking capability are limited due to unbalanced transmission. The ADAM-4521 addressable converter solves this problem and lets you easily build up an RS-485 network with your RS-232 devices by assigning each one an address for easier communication.

Features:

  • Automatic RS-485 data flow control
  • 1000 VDC isolation protection
  • Surge protection RS-485 data line
  • Transmission speed up to 115.2 Kbps
  • Networking up to 1200 meters (4000 feet)
  • Reserved space for termination resistors
  • Power and data flow indicator for troubleshooting
  • Power requirement: +10 to +30 VDC
  • Mounts easily on a DIN-rail, panel or piggyback
  • RS-232 and RS-485 can be set to different baud rates
  • Watchdog timer function
  • Software confi gurable to either addressable or non-addressable mode
  • All communication setups stored in EEPROM

Specifications:

Category Attribute Value
Display LED Indicators Comm
Power Supply Power Requirement 10~30 VDC
General Comm. Distance RS-422/485: 1.2 km RS-232: 15 m
Communication Speed Serial: From 300 to 115.2 k
Connector RS-232: female DB9
RS-422/485: plug-in screw terminal
Data Flow Control Yes
Humidity 5~95 %RH
Interface RS-232 to RS-422/485
Isolation Protection 1,000 VDC
Temperature (Operating) -10~70 °C (14~158 °F)
Temperature (Storage) -25~85 °C (-13~185 °F)

Datasheet on ADAM-4521 (pdf, opens in a new tab)

ADAM-4561 1-port Isolated USB to RS-232/422/485 Converter


ADAM-4561/4562 allows PC users to connect a serial device to a system that use a USB interface. To attach the ADAM-4561/4562 to a PC, you don’t need to open the chassis or power down your PC. Instantly get one or two extra high-speed RS-232/422/485 ports.
ADAM-4561
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ADAM-4561

ADAM-4561/4562 allows PC users to connect a serial device to a system that use a USB interface. To attach the ADAM-4561/4562 to a PC, you don’t need to open the chassis or power down your PC. Instantly get one or two extra high-speed RS-232/422/485 ports. The power is derived from the USB port, so there are no power adapters to deal with. This makes the ADAM-4561/4562 especially suitable for modems, printers, POS systems and industrial control devices.

Features:

  • Full compliance with USB V1.1 specifications
  • RS-232/422/485 port supported
  • Transmission speed up to 115.2 kbps
  • Isolation protection 3000 VDC provided
  • Automatic RS-485 data flow control
  • No external power supply necessary; the hub derives its power from the USB port
  • Plug & Play installation
  • No additional IRQs or I/O ports required
  • Hot swap function supported

Specifications:

Category Attribute Value
Display Interface USB 2.0
LED Indicators Comm
General Comm. Distance Serial: 1.2 km USB: 5 m
Communication Speed Serial: From 75 to 115.2 k
Connector USB RS-232/422/485: plug-in screw terminal
Data Flow Control Yes
Humidity 5~95 %RH
Interface USB to RS-232/422/485
Isolation Protection 2,500 VDC
Temperature (Operating) -10~70 °C (14~158 °F)
Temperature (Storage) -25~85 °C (-13~185 °F)

Datasheet on ADAM-4561 (pdf, opens in a new tab)

IC-485 – RS232 to RS485/422 Converter

IC485S – RS-232/RS-485 Interface Converter


Home Products Data Communication Industry Controls IC485S

IC485S is a 2-way converter for converting RS-232 signals to and from RS-422/RS-485 signals in long-distance applications up to 1200 m (4000 ft.). It supports the connection of up to 32 hubs and features monitoring to confirm the data passing between devices.

IC485S
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IC485S

IC485S is a 2-way converter for converting RS-232 signals to and from RS-422/RS-485 signals in long-distance applications up to 1200 m (4000 ft.). It supports the connection of up to 32 hubs and features monitoring to confirm the data passing between devices.

Features:

  • Data transmission controlled by the RTS signal.
  • DCE/DTE selectable.
  • Point to point, multidrop, and simplex/duplex link selection.
  • Four wire full duplex; two wire half duplex.
  • Compact size.
  • Cable distance of up to 1200m (4000 ft.).
  • Monitor configuration support.
  • Supports baud rates up to 115.2kbps.
  • OS Support: Windows 2000, Windows XP

Specifications:

Connectors 1 DB-25 Female (RS-232)
RS-485 / RS-422 Four Terminal Block
1x RJ-11 Female
Switches DCE, DTE, Monitor
TxON, RxON
TxRTS, RxRTS
TxRTS, RxON
Power Consumption DC9V, 1.35W (Max)
Signal Range 1200 m [4000′] (Max)
Data Rate Up to 100 Kbps under 1200 m [4000′]
Environmental
Operating Temperature 0 ~50˚C
Storage Temperature -20 ~ 60˚C
Humidity 0~80% RH, Non-condensing
Physical Properties
Housing Plastic
Weight 0.05 kg ( 0.11 lb )
Dimensions (L x W x H) 7.90 x 5.45 x 2.10 cm
(3.11 x 2.15 x 0.83 in.)

IC485SN – RS-232/RS-485 Interface Converter


IC485SN is a 2-way converter for converting RS-232 signals to and from RS-422/RS-485 signals in long-distance applications up to 1200 m (4000 ft.) – without the need of an external power supply.

IC485SN
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IC485SN

IC485SN is a 2-way converter for converting RS-232 signals to and from RS-422/RS-485 signals in long-distance applications up to 1200 m (4000 ft.) – without the need of an external power supply.

Features:

  • Data transmission controlled by the RTS signal.
  • DCE/DTE selectable.
  • Point to point, multidrop, and simplex/duplex link selection.
  • Four wire full duplex; Four wire half duplex.
  • Compact size.
  • Cable distance of up to 1200m (4000 ft.).
  • Non powered operation.
  • Supports baud rates up to 115.2kbps.
  • OS Support: Windows 2000, Windows XP

Specifications:

Connectors 1 DB-25 Female (RS-232)
RS-485 / RS-422 Four Terminal Block
1x RJ-11 Female
Switches DCE, DTE
TxON, RxON
TxRTS, RxON
TxDTR/RTS,RxDSR/ON
Power Consumption DC9V, 0.9W (Max)
Signal Range 1200 m [4000′] (Max)
Data Rate Up to 100 Kbps under 1200 m [4000′]
Environmental
Operating Temperature 0 ~50˚C
Storage Temperature -20 ~ 60˚C
Humidity 0~80% RH, Non-condensing
Physical Properties
Housing Plastic
Weight 0.06 kg ( 0.13 lb )
Dimensions (L x W x H) 7.90 x 5.45 x 2.10 cm
(3.11 x 2.15 x 0.83 in.)

 

JED Serial Line Converters

J995X RS232C to RS422/RS485, Auto-Tx-On, Isolated


The J995X is a small RS232 to RS485 converter designed for industrial and commercial applications where RS485 is used because of its reliable long range of communications, high speed, multi-drop and differential transmission mode via simple twisted-pair cable.

J995X
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J995X

Opto-isolated (1400VAC), bidirectional, (2 or 4 wire). Works reliably up to 115.2kb/sec. When configured to RS485 mode, the RS485 end normally sits in receive mode, and switches automatically to transmit mode when a character enters the RS232 port.
The baud rate can be set internally with jumpers to ensure that the transmitt mode stays on for long enough for all the bits in the character to be transmitted.

The RS232 side is normally supplied with DB9F on a 45mm ribbon cable, DCE connection (optionally, 25-pin DCE or DTE can be provided).

This side is normally powered from the host (by rectification of the control lines – OK with PC RS232 port).
A pair of screw terminals is provided to power this side if there are problems, e.g. if only 3 wires are being used (RX, TX, Gnd) and there is no +ve voltage from host (9 to 12VDC required).
Two internal LEDs shows transmit and receive data. The RS232 side is opto-coupled to the RS422/485 side.

The RS422/485 side has screw terminal connections inside the end of the case, and to preserve the isolation from the RS232 end of the converter, must be powered with its own isolated 9VDC power supply or mains adaptor (e.g. PAK9 below).
RS485 termination and RS485/RS422 receiver biasing jumpers (see above) are provided. Another jumper can be installed to disable the receiver drive to the RS232 line during an RS 485 transmission.
Plastic Case: 25x50x100mm. Power supply not included.

External power supply, isolated, 9 to 12 VDC is required
PAK9 Plug Pack Mains Adaptor: 240VAC to 9VDC: $20+GST

“Isolated power supply” means that the power supply output + & – terminals are not connected to ground or anything else.

Datasheet on J995X (pdf, opens in a new tab)

J995A RS232C to RS422/RS485, Isolated


The J995A is a small RS232 to RS485 converter designed for industrial and commercial applications where RS485 is used because of its reliable long range of communications, high speed, multi-drop and differential transmission mode via simple twisted-pair cable.

J995A
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J995A

Similar to J995X except that the RTS or CTS line on the RS232 side is used to enable the RS485 transmit function.
The RS485 side normally sits in receive mode until the RTS or CTS turns the transmit function on, then off again.
See J995X for Auto-Tx-On (RTS or CTS control not reqd).

The RS232 side has ribbon cable 0.5m, with 25-pin D female connector, (specify male if required).
The ribbon cable can be connected as DTE or DCE. The host powers the RS232 side.
Two internal LEDs shows transmit and receive data.

The RS422/485 side has screw terminal connections, and may be powered with an isolated 9VDC 100mA mains adaptor.
RS485 termination and RS485/RS422 receiver biasing jumpers (see above) are provided. Another jumper can be installed to disable the receiver drive to the RS232 line during an RS 485 transmission.
Plastic Case: 25x50x100mm. Power supply not included.

External power supply, isolated, 9 to 12 VDC is required

PAK9 Plug Pack Mains Adaptor: 240VAC to 9VDC: $20+GST

“Isolated power supply” means that the power supply output + & – terminals are not connected to ground or anything else.

Datasheet on J995A (pdf, opens in anew tab)

Alfatron Converters (not isolated)

A440 – Serial Interface Converter


The ASeries A440 allows any RS-232 serial device to communicate with any RS-422 serial device. As well as transferring data the A440 provides one pair of handshaking lines, i.e. DTR/DSR or CTS/RTS for the
control of the data flow

A440
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A440

The ASeries A440 allows any RS-232 serial device to communicate with any RS-422 serial device. As well
as transferring data the A440 provides one pair of handshaking lines, i.e. DTR/DSR or CTS/RTS for the
control of the data flow.

Simple to use and cost effective, the A440 has been engineered for use in both industrial and commercial
environments.

Features:

  • Bi-directional RS-232 <> RS-422 interface conversion in asynchronous mode
  • Transient Protection on RS-422 lines
  • Supports Xon/Xoff Software Handshaking
  • Supports DTR/DSR or CTS/RTS Handshaking
  • Switchable DCE/DTE selection for RS-232 port
  • Transfer data reliable at up to 64Kbps
  • LED indicators for data activity
  • Reverse Polatity Protection on power input
  • Standard DB25 used for RS-232 and RS-422 interfaces

Specifications:

RS-232 Port: Asynchronous RS-232 DB-25 female connector Switch Selectable DCE/DTE Transfer up to 64Kbps
RS-422 Port: DB-25 female connector 120V termination resistor selection for handshaking lines ‘RD’ & ‘DSR’
Protection: Transient Voltage Supression Diodes RS-422 – Transmit Data Lines – Receive Data Lines – DTR & DSR handshake lines
LED Indicators: Receive Data RS-232 Receive Data 20mA Current Loop Power On
Power Supply: 9V (200mA) DC Reverse Polarity Protection
Dimensions: 84m x 58mm x 23mm
Weight: 160 grams
All Specifications subject to change without notice

Datasheet on A440 (pdf, opens in a new tab)

A450 Serial Interface Converter


RS-485 Serial <> RS-232 Serial Interface Converter

A450
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A450

Features:

  • Multidrop up to 32 drivers and 32 receivers at distances over 1200 metres
  • Non-powered RS-485 operation over distances up to 100 metres
  • Supports both 4-wire and 2-wire operation
  • Transcient Protection on RS-485 lines
  • Screw terminal block used for RS-485 interface
  • Standard DB25 used for RS-232 Interface
  • Switchable termination resistors for RS-485 port
  • Switchable DCE/DTE selection for RS-232 port
  • Transfer data up to 115Kbps
  • LED indicators for data activity
  • Reverse Polatity Protection on power input

Specifications:

RS-232 Port: Asynchronous RS-232 DB-25 female connector Switch Selectable DCE/DTE Transfer up to 64Kbps
RS-485 Port: Screw Terminal Block – 5 position Switchable 120V termination
Protection: Transient Voltage Supression Diodes

RS-485 – Transmit Data Lines

– Receive Data Lines

LED Indicators: Receive Data RS-232

Receive Data RS-485

Power Supply: 9V (200mA) DC Reverse Polarity Protection Non-powered up to 100 metres (point-to-point only)
Dimensions: 84m x 58mm x 23mm
Weight: 160 grams
All Specifications subject to change without notice

Datasheet on A450 (pdf, opens in a new tab)

A451 Serial Interface Converter


RS-485 Serial <> RS-232 Serial Interface Converter

A451
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A451

Features:

  • Multidrop up to 32 drivers and 32 receivers at distances over 1200 metres
  • Internal jumper settings allow the use of either ‘standard’ or ‘crossed’ Ethernet cables
  • Supports both 4-wire and 2-wire operation
  • Transient Protection on RS-485 lines
  • Transmits data at up to 115Kbps
  • Non-powered RS-485 operation over distances up to 100 metres
  • Switchable DCE/DTE selection for RS-232 port
  • Switchable termination resistors for RS-485 port
  • RJ-45 connectors on RS-485 port
  • LED indicators for data activity
  • Monitor mode allows problem diagnosis on the RS-422/485 bus
  • CE and C-Tick Approved
  • Very LOW COST – Very BIG FEATURES

Specifications:

RS-232 Port: Asynchronous RS-232 DB-25 female connector Switch Selectable DCE/DTE Transfer up to 64Kbps
RS-485 Port: RJ-45 Input & Output connectors Switchable 120V termination
Protection: Transient Voltage Supression Diodes

RS-485 – Transmit Data Lines

– Receive Data Lines

LED Indicators: Receive Data RS-232

Receive Data RS-485

Power Supply: 9V (200mA) DC

Reverse Polarity Protection

Non-powered up to 100 metres (point-to-point only)

Dimensions: 84m x 58mm x 23mm
Weight: 160 grams
All Specifications subject to change without notice

Datasheet on A451 (pdf, opens in a new tab)

CONV232-485 & CONV232-422 DB9 RS232 to RS422/RS485 Converters

CONV232/485 DB9 RS232 to RS485 Converter


The CONV485/DB9 allows any PC with standard DB9 male RS-232 COMM Port to run RS-485 devices.

CONV232/485
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CONV232/485

The CONV485/DB9 allows any PC with standard DB9 male RS-232 COMM Port to run RS-485 devices.

Features:

  • Up to 460.8kps
  • No External Power Required When Communicating Via a Short Cable with One Device
  • Simple Installation, No Need to Shut off PC to Connect
  • Nothing to Configure, No Jumpers to Set
  • Automatically Adjusts to the Speed of the Data
  • Auto RTS Built In
  • Plugs Directly into Standard PC RS232

Specifications:

Specification Value
Interface Protocols RS-232 to RS-485 (2-wire)
Optical Isolation No
RS-232 connector DB9 female
RS-422/485 connector DB9 male
Max Baud Rate (Kbaud) 230
Port or External Power Either
Port Powered Pins RTS, DTR
External Power 5.5-16VDC, 30mA
TX Control Auto Enabled RS-485
TX, RX LEDs No

CONV232/422 DB9 RS232 to RS422/485 4 wire Converter


The CONV232/422 allows any PC with standard DB9 male RS-232 Port to communicate with RS-422 and RS-485 devices. The CONV232/422 can do full duplex peer to peer or one master, one slave communications in RS-422 or RS-485 four wire mode.

CONV232/422
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CONV232/422

The CONV232/422 allows any PC with standard DB9 male RS-232 Port to communicate with RS-422 and RS-485 devices.

The CONV232/422 can do full duplex peer to peer or one master, one slave communications in RS-422 or RS-485 four wire mode. It can also do two wire RS-485 in a one master, multiple slaves multi-drop configuration when its transmit and receive pins are tied together. In this configuration it echoes data on the RS-232 side.

To operate in 2-wire RS-485 mode the CONV232/422 requires the communications software to control the RTS line. For dedicated two wire RS-485 it is recommended the CONV232/485 be used. Optional External Power is required when communicating with more than two devices or over long transmission lines. External power (+5.5VDC to +16VDC @ 40 mA) can be connected to J2 (RS422 side) pin 8 with return via J2 pin 5.

Features:

  • Up to 230.4kbps
  • Supports 4 wire RS-422 and 4/2 wire RS-485 full/half duplex communication
  • No External Power Required When Communicating Via a Short Cable with One Device
  • Simple Installation, No Need to Shut off PC to Connect
  • Nothing to Configure, No Jumpers to Set
  • Automatically Adjusts to the Speed of the Data
  • Plugs Directly into Standard PC RS232

Specifications:

Specification Value
Interface Protocols RS-232 to RS-422/485 (2/4-wire)
Optical Isolation No
RS-232 connector DB9 female
RS-422/485 connector DB9 male
Max Baud Rate (Kbaud) 230
Port or External Power Either
Port Powered Pins RTS, DTR
External Power 5.5-16VDC, 30mA
TX Control Software controlled RTS
TX, RX LEDs No

 

AIC RS232 to RS485 Converter

PC485 – RS232 to RS485 Converters


RS232 to RS485 through connector – self contained package
AIC PC485
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AIC PC485

Features:

  • The PC485 RS232 to RS485 converter is supplied as a through connector, self contained package.
  • Power for the unit is obtained from an IBM PC, or compatible, RS232 port via pins 7 (GND) & 20 (+12V via DTR line). Alternatively the PC485 may be externally powered (9 to 12VDC), see wiring diagram overleaf. The use of an external power source is generally only required when a low power serial card is used in the computer and multiple external units are being addressed or when the serial output does not provide power.
  • Baud rates accepted are from 300 to 38400 baud. The converter automatically detects the baud rate being used.
  • Connection at the RS232 end is via a 25 way female “D” connector. At the RS485 end the connector is a 25 way male “D” connector.
  • Dimensions: 63mm (h) x 56mm (w) x 16mm (d)

Datasheet on AIC PC485 (pdf, opens in a new tab)

RMSI485 – RS232 to RS485 converter


RS232 to RS485 DIN Rail mounted converter – isolated output

AIC RMSI485
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AIC RMSI485

The PC422 and PC485 converters are supplied as a through connector, self contained package. The PC485 gives RS232 to RS485 conversion. The PC422 give RS232 to either RS485 or RS422 conversion.

Power for the units is obtained from an IBM PC or compatible RS232 port via pins 7 (GND) & 20 (+12V via DTR line). Alternatively the converters may be externally powered (9 to 12VDC), see wiring diagram overleaf. The use of an external power source is generally only required when a low power serial card is used in the computer and multiple external units are being addressed or when the serial output does not provide power.

Baud rates are from 300 to 38400 baud. The converter automatically detects the baud rate being used.

Connection at the RS232 end is via a 25 way female “D” connector. At the RS485/RS422 ends the connector is a 25 way male “D” connector.

Operation mode and setup selections are made via circuit board links.

Datasheet on AIC RMSI485 (pdf, opens in a new tab)

J990 RS232C to Current Loop

J990 RS232 to 20mA loop isolated interface.


a bi-directional interface from a PC to a 20mA signalling loop. This is useful for interfacing to PLC and other industrial systems from a PC or terminal. While this is an old standard, it is still in occasional use, and JED still supports it with this box.
J990
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J990

Opto-isolated, bidirectional, duplex 4-wire or simplex 2-wire I loop.

Supports up to 19Kkbps or more, the supported data speed depends on the line length and quality.

Allows communications up to 1Km or more, with protection from ground currents and accidental connections to high voltage. At the far end the loop can be driven by another STD-990 for isolation at that end, or by a JED 3-slot motherboard power supply. A plug-pack at one end can provide isolated loop power for both directions. Case: 25x50x100mm. Incl 16 way (2x8) cnnctr & ribbon cable.

Interconnects RS232 systems (e.g. a PC) to industrial systems (e.g. PLC) via the 20mA loop standard. Loop current flows in normal state (broken by TX byte, giving a security alarm if line broken (overrun error in communications software).

Isolation rated at 2,500 volts.

Allows multi-dropping with a number of stations connected in series with no special TX ‘‘connect-to-line’’ control software needed.

RX can monitor transmission on line, so verifying transmission is actually happening on the serial network.

This device is designed with five functions in mind:

  1. To extend the common RS232 communication standard to distances of 1 Km. or more.
  2. To eliminate the problem of ground currents and common mode voltages which can exist between the grounds of electronic equipment separated by distance, especially in industrial or rural-agricultural applications of computers.
  3. To totally protect the computing or data logging equipment at both ends of a data link from accidental connection of one or more signal connections between equipment to a high voltage, e.g. 240 volt mains or surges induced by lightning.
  4. To allow connection between existing 20-mA interface equipped systems and RS232C connections on JED or other control computers, or PC’s from any source, which usually have RS232C only communication facilities.
  5. This device is particularly useful in interfacing Programmable Logic Controllers to PC’s.

Data Path:
RS232 data is fed through a Hewlett Packard HCPL4100 current loop transmitter/isolator. Both terminals of this driver are available on screw terminals on the isolated side. 20 mA loop current passes through the LED of a 20 mA opto-isolator receiver (HCPL4200) and the output is converted back to RS232 data.

The RS232 connections are two rows of stake pins configured in such a way that a ribbon cable can mate directly with a D25 connector as a DTE or DCE device.

Loop Power Supply:
There is no electrical connection between the RS232 and the 20 mA sides, so power for the loop cannot come from the RS232 system. Power for the RS232 output is actually generated from the RS232 signals themselves.

A simple bridge rectifier and filter capacitor with two 20 mA active current sources is provided for the transmit and receive loops. This power supply is normally fed with a 12-15 volt AC or DC signal from a double insulated plug pack which is available as an option. Loop power is normally provided to a system for both transmit and receive loops from one end of a system and so one plug pack can power both loops and is needed at only one end.

Performance is quoted by HP at 20 KBaud data rate at 400 metres. Curves shown on the data sheets show a linear relationship between speed and line length. Induced noise isolation is excellent, even with unscreened cables, although in extreme cases shielded cables could help. However performance is many times better than an RS232
system with the added advantage of complete isolation of the wiring from the computers at either end.

External power supply, isolated, 9 to 12 VDC required

PAK9 plug pack mains adaptor 240VAC to 9VDC: $20+GST

Datasheet on J990 (pdf, opens in a new tab)

Fibre Optic Converters – Media Converters

Fibre Optic Information

Single Mode: A fiber with a small core, only a few times the wavelength of light transmitted, that only allows one mode of light to propagate. Commonly used with laser sources for high speed, long distance links.

Multimode: A fiber with core diameter much larger than the wavelength of light transmitted that allows many modes of light to propagate. Commonly used with LED sources for lower speed, short distance links.

ST Connector: Precise zirconia ceramic ferrule. Easy-to-assemble, one-piece bayonet mounting system.
For both single mode and multimode fibers using in communication applications.

ADAM-4541 Multi-mode Fiber Optic to RS-232/422/485 Converter


Fiber optics transmission offers the benefits of wide bandwidth, immunity to EMI/RFI interference, and secure data transmission. ADAM-4541 can be used as an RS-232/422/485 point-to-point or point-to-mutipoint connection for transmitting and converting full/half-duplex signals and their equivalents within a fiber optic environment.
ADAM-4541
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ADAM-4541

Fiber optics transmission offers the benefits of wide bandwidth, immunity to EMI/RFI interference, and secure data transmission. ADAM-4541 can be used as an RS-232/422/485 point-to-point or point-to-mutipoint connection for transmitting and converting full/half-duplex signals and their equivalents within a fiber optic environment. Fiber optics is the perfect solution for applications where the transmission medium must be protected from electrical exposure, lightning, atmospheric conditions or chemical corrosion.

Features:

  • Easily mounted on a DIN-rail, panel or piggyback
  • Transmission speeds of up to 115.2 kbps
  • Optical fibers enable transmission of 2.5 km (measured with 62.5/125 mm)
  • Half/Full-duplex, bidirectional transmission mode
  • Avoids lightning strikes and EMI/RFI interference
  • Prevents damage from electrostatic discharge
  • Stable and error-free data transmission
  • Automatic internal RS-485 bus supervision
  • No external flow control signals required for RS-485
  • Transient suppression and over-current protection on RS-422/485 data lines
  • Reserved space for termination resistors
  • LED for power and data flow indication
  • Power requirement: +10 to + 30 VDC

Specifications:

Category Attribute Value
General Connectors 1xplug-in terminal block (#14~22 AWG) (RS-232/422/485) 2x ST fiber connector
Interface Fiber Optic to RS-232/422/485
Power Input Unregulated10-30VDC w/power reversal
Serial Communication Communication Mode Asynchronous
Speed Modes (bps) 1,200; 2,400; 4,800; 9,600; 19.2k; 38.4k; 57.6k; 115.2k and RS232/422 mode (switchable)
Transmission Mode Full/half duplex, bidirectional
Environment Operating Humidity 5 ~ 95% RH
Operating Temperature -10 ~ 70°C (14 ~ 158°F)
Storage Temperature -25 ~ 85°C (-13 ~ 185°F)
Fiber Optic Communications Optical Power Budget (Attenuation) 12.5 dB (measured with 62.5/125 µm)
Transmission Distance 2.5 km
Transmission Mode Multi mode (Send and Receive)
Wavelength 820 nm

Datasheet on ADAM-4541 (pdf, opens in a new tab)

ADAM-4542+ Single-mode Fiber Optic to RS-232/422/485 Converter


Fiber optic transmission offers the benefits of wide bandwidth, immunity to EMI/RFI interference, and secure data transmission. ADAM-4542+ can be used as a RS-232/422/485 point-to-point or point-to-multipoint connection for transmitting and converting full/half-duplex signals and their equivalents within a fiber optic environment.
ADAM-4542+
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ADAM-4542+

Fiber optic transmission offers the benefits of wide bandwidth, immunity to EMI/RFI interference, and secure data transmission. ADAM-4542+ can be used as a RS-232/422/485 point-to-point or point-to-multipoint connection for transmitting and converting full/half-duplex signals and their equivalents within a fiber optic environment. Fiber optics is the perfect solution for applications where the transmission medium must be protected from electrical exposure, lightning, atmosphere. ADAM-4542+ is specifically designed to link various machinery equipped with a RS-232/422/485 communication port (such as computer systems or manufacturing machines). Using standard SC type fiber connector, the module’s fiber optic ports can accommodate a wide range of fiber optic cable sizes, including 62.5/125, 250/125, 100/140 mm.

Features:

  • Easily mounted on a DIN-rail, panel or piggyback
  • Transmission speeds of up to 115.2 kbps
  • Half/Full-duplex, bidirectional transmission mode
  • Avoids lightning strikes and EMI/RFI interference
  • Prevents damage from electrostatic discharge
  • Stable and error-free data transmission
  • Automatic internal RS-485 bus supervision
  • No external flow control signals required for RS-485
  • Transient suppression and over-current protection on RS-422/485 data lines
  • Reserved space for termination resistors
  • LED for power and data flow indication
  • Power requirement: +10 to + 30 VDC

Specifications:

Category Attribute Value
Display LED Indicators Status, Tx/Rx
General Fiber Type Single-mode
Mounting Panel
Power 10-30VDC
Serial Connector Terminal Block
Serial Type RS-232/422/485
Temperature -10 to 70C
Power Supply Power Requirement 10~30 VDC
General Comm. Distance Serial: 1.2 km Fiber: 15 km
Communication Speed Serial: From 1,200 to 115.2 k
Connector RS-232/422/485: plug-in screw terminal Fiber: SC connector
Data Flow Control Yes
Humidity 5 ~ 95% RH
Interface Fiber Optic to RS-232/422/485
Isolation Protection Yes
Temperature (Operating) -10~70 °C (14~158 °F)
Temperature (Storage) -25 ~ 85°C (-13 ~ 185°F)

Datasheet on ADAM-4542+ (pdf, opens in a new tab)

Fibre Optic Cables:

Fibre Optic Cables, duplex, multimode:
SC-SC 1m/2m/3m
ST-SC 1m/2m/3m
ST-ST 1m/2m/3m/5m

RS232 to RS232 Isolator Box – Optical Isolation

9POP4 RS-232 Optical Isolator


The 9POP4 isolates and protects RS-232 equipment from lightning surges, accidental high voltage shorts, and ground loops. RS-232 data signals TD, RD, RTS, and CTS are supported at up to 230.4 kbps. Isolation circuits are 2.5 kV rated and protects valuable equipment while maintaining maximum uptime.
9POP4
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9POP4

The 9POP4 isolates and protects RS-232 equipment from lightning surges, accidental high voltage shorts, and ground loops. RS-232 data signals TD, RD, RTS, and CTS are supported at up to 230.4 kbps. Isolation circuits are 2.5 kV rated and protects valuable equipment while maintaining maximum uptime.

Each side of the isolator receives power from a single 12 VDC power supply to maintain the isolation. This powering configuration allows the device to be used in a system with only one power supply, regardless of the power provided by the RS-232 ports.

The isolator uses DB9 male and DB9 female connectors. The female connector is wired as a DCE and should be connected to a DTE port. The male connector is a DTE and should be connected to a DCE port. If you are connecting a DTE to a DTE or a DCE to a DCE, you will need a null modem adapter.

Power supplies recommended and available from B&B Electronics have been tested and certified. Using any other power supply may bypass or degrade the isolation barrier.

Features:

  • 2.5 kV Isoaltion
  • ESD Protection -15 kV
  • Compact IP 30 Plastic Case

Specifications:

Serial Technology
RS-232 TD, RD, RTS, CTS, GND
Data Rate 230.4 kbps
Isolation 2.5 kV
ESD 15 kV Air Discharge, 8 kV Contact
Connectors DB9 female (DCE)
DB9 male (DTE)

 

Power
Source External required
Power Connector 2.5 mm jack
Input Voltage 12 VDC
Power Consumption 731 mW

 

Mechanical
Dimensions 10.4 x 4.3 x 2.0 cm (4.1 x 1.7 x 0.86 in)
Enclosure IP 30, plastic
Weight 54.4 g (0.12 lbs)
MTBF 262084 hours
MTBF Calc. Method MIL 217F Parts Count Reliability

 

Environmental
Operating Temperature 0 to 70°C
Storage Temperature -40 to 85°C
Operating Humidity 0 to 95% Non-condensing

 

Approvals / Certifications
Emissions FCC Class B, CISPR Class B (EN55022)
CE EN61000-6-1:2007 (Light Industrial) EN61000-4-2:2008 (ESD) ESD, ±8kV/±15kV (contact/air)
EN61000-4-3:2006 (RFI) RFI, 80-1000MHz 3V/m, 1.3 – 2.7 GHz, 3V/m
EN61000-4-4:2004 (EFT Burst) EFT, ±1kV Power, ±500V Data Lines
EN61000-4-5: Ed2, 2005 (Surge) Surge, ±2kV Power (AC), N/A on Data Lines
EN61000-4-6:2005 (CI) CI, 3Vrms all ports


Datasheet on ADAM-4541
(pdf, opens in a new tab)