The SI8 is a serial interface unit for conversion of the Monibus serial data
bus (TTL signal level) to RS 232 format. css
The SI8 can interface up to 250 µSmart sensors into a single RS 232 port
on a lap top computer, telephone or radio.
Note that the baud rate (1200bps), parity etc., is specific for the Monitor
Sensors products.
Other configurations are available for different applications and these applications
should be discussed with us.
SI8 consists of a small box 72x43x27mm with 3 cables coming out, 2 at one end,
the 3rd at the other end.. The cables are 0.65m long.
The 3 cables: RS232 with DB9F connector; Power (+ &
–, 6-28 volts unregulated DC);
Monibus triple cable (+, –, & serial data)
The SI8 provides power to the sensors attached to it. Large
picture of SI8
The SI8 gets this power either from
1) the host computer's RS232 port or
2) a supplied mains adaptor, or
3) 6 - 24V DC unregulated. This could be an external
battery.
The SI8 itself uses about 7mA. Add to this the current drawn by the attached
sensors.
The RS232 port on a 486 computer can supply 3 or 4 mA (1 or 2 sensors).
The RS232 port on a Pentium computer can supply 8 to 10mA (8 or 10 sensors).
Sensor cable length can be up to 4000m.
Output : RS232
Baud Rate : 1200
Data Bits : 8
Stop Bits : 1
Parity : None
Flow Control : None
Protocol of Sensors which may be attached to the SI8:
A single ASCII code causes the unit to download selected parameters as a comma
delineated ASCII string or the device can be commanded to output the parameters
continuously.
Power Requirements: 6 - 24V DC unregulated.
(Note: this unit provides all power requirements for the sensors).
Weight : 450grams
Dimensions : 100mm x 60mm x 200mm
