M20 GSM Terminal

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Solve all your wireless communication and monitoring needs                                      MAY 2002
with the Telecommunications approved M20 Terminal.

This small and lightweight Terminal is capable of interfacing with any of your industrial plant and equipment or commercial assets.

The M20 Terminal is used to transmit data, short messages (SMS), voice messages & fax messages.
If you want to make contact with anyone around the world, simply connect an antenna and fit a standardised mini SIM card.
Use an RS232 interface to take control.
This device is intended for universal use in various areas of application.
A broad range of voltages is therefore available because common industrial interfaces have been implemented.
An LED in the robust plastic casing displays the operating status of the terminal.

Note:  M20 is the engine used inside the M20T

Like a GSM digital mobile phone but with a serial port, and no microphone or earphone.     ozb czsz
Connect to an RS232 device such as a Datataker data logger.
To the computer, it looks like a modem with the usual Hayes command set.
Use Windows Hyperterminal to set up the M20T (19200bps, 8 data, 1 stop, no parity, no flow control).

For technical reasons, a Telstra SIM card is recommended for use in Australia.

   M20 technical data sheet: click here

Pictures

Picture of Antenna end              Antenna FME Connector            RS232 & power end   Antenna      Antenna Base & Cable

FAQ on the M20 GSM modem and antennae: click here  

M20T GSM Terminal

Voice, Data, Fax & SMS
Siemens M20 Technology
GSM 900 Phase 2
Multi Purpose Device
Simple Integration
Industrial Interfaces

Why you should use the M20T Terminal

Reduced Costs & Maintenance Time for your valuable assets
Reliable & Accurate Data Transmission
Provides 24 Hr, 365 days a year Continuous Monitoring of Assets
Full Technical Support Provided
Increased Equipment Productivity & Less Down time
Ideal for Remote or Hazardous Locations

The M20T Terminal can be mounted from above or below by means of two screws.

Features

• User-friendly integration in the system environment using commercially available connection components
• Data, voice, fax and SMS services
  (GSM Phase II)
• Power supply/ignition line on 6-pin Western connector
  (8 V to 28.8 V DC, 5% ripple, surge Proof to 30V)

Current consumption at 12V:
   Stand-by state (voltage is applied, ignition not yet asserted) I =/< 0.2 mA
   Idle mode: I < 60 mA
   Average call in progress: peak: I < 2 A. (pulsed t = 577ms, at T = 4.615ms)
   Arithmetic mean: I < 275 mA

• Protected V.24/V.28 interface with 9-pin SUB-D jack (screwed)
• Mini SIM card reader with integral drawer (3V)
• FME antenna jack (female) fed out per cable (approx. 10 cm)
• Listener interface on 4-pin Western connector (listener parameters can be set with AT commands/connection of a commercially available headset)
• Mounting from bottom or top
• Resistant against supply voltage polarity reversal M20 Terminal – Technical Specifications

Mechanical characteristics

Note: the M20 Terminal shall not be used within a wet environment.

Electrical description and interfaces

M20T Terminal has following plugs for power supply, interfacing and antenna:
6-pole Western plug (female) for power supply, ignition signal and audio-line-in/out-signal
4-pole Western plug (female) for connecting a handset
9-pole (female) SUB-D plug for V.24/V.28 serial interface
Antenna cable with FME plug (female)

Weight 145 g
Dimensions (max) LxWxH = 107.0 x 63.5 x 31.3 mm

Temperature range -20°C to 55 °C
Protection class IP40
Mechanical vibrations Amplitude 7.5 mm at 5-200 Hz sinusoidal
Max. pulse-acceleration 30g pulse with 18 ms duration time
Air humidity 5–98%

All specifications are subject to change without notice.

Starting up and Logging on to the GSM network

1. Insert the SIM card: Telstra, with PIN number not enabled, and a "data" type phone number.
2. Connect the serial cable (straight through connection) between the M20T and the PC
3. Connect the power supply
4. Blinking LED indicates: power on, searching for network or waiting for PIN
5. When the M20T is logged onto the GSM network, the LED is ON without blinking.
6. ATDxxxxxxxx

See the following useful pages in the Technical Manual.

Starting up (similar to above) page 150 (do not use the PIN command)
AT Commands:    pages 27-29

AT Cellular Commands (AT+...):  page 54