Gill Instruments Ltd
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MaxiMet
Page 19
Issue 1
Doc. No. 1957-PS-000x
March 2015
4.4.
Connections
Any cable wires not used should be isolated and grounded at the terminating equipment/user end.
Digital OV should be used in conjunction with RS422 TX/RX lines in order to improve noise
immunity.
View of the MaxiMet connector
9 way connector and cable connections
4.5.
Power supplies
MaxiMet units
Supply Voltage:
9v to 30v DC.
Normal Mode Current:- 25mA Average @12v dc GMX200.
80mA Average, @ 12v dc GMX600.
The MaxiMet has reverse polarity protection.
9 Way Connector
Number
Signal Designation
1
Signal Ground
2
ve
3
Supply –ve
4
RS422/485 TXD+
5
RS232 TXD, RS422/RS485 TXD-
6
RS422/RS485 RXD+
7
RS232 RXD, RS422/RS485 RXD-
8
Comms Select – Only.
Applicable if MaxiMet COMMS Interface Setting set for EXT
using MetSet. If MaxiMet is set for EXT Comms then:-
For RS232 connect Pin 8 to Pin 2 +ve.
For RS422 leave Pin 8 open circuit or connect to Pin 3 –ve
.
9
SDI-12 Data