Gill Instruments Limited
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MetStream 100
Page 10
Issue 2
Doc. No. 1955-PS-001
March 2016
4.5.7
RS232/422/485 Connector
A removable 8 way plug is supplied for the RS232/422/485 data input connections.
The part number for the plug is Phoenix Contact 8 way spring terminal Part 1881383
(supplied with MetStream).
Connections to the RS232/422/485 connector are
CONTACT/
COMMS MODE
1
2
3
4
5
6
7
8
RS232
Rx+-
-
-
Tx-
+12v dc
Output
Power
Enable
0v
0v
RS422/485
Rx+
Tx+
Rx-
Tx-
+12V dc
Output
Power
Enable
0v
0v
Recommended range of wire gauges that can be used with the connector is 20 AWG to
28 AWG.
Wires connected to this plug should be stripped back 8 mm for insertion into the push/lock
connector.
4.5.8
Power Enable Function
The +12v dc output is only enabled on Terminal 5 when the
Power Enable connection
on
Terminal 6 is connected to Terminal 7 (0v) or Terminal 8 (0v).
If Terminal 6
Power Enable
is left open circuit then the 12V supply output from Terminal
5, and any connected instrument using this supply, will be disabled.
In this case, the external instrument should be powered separately from the MetStream by
a customer-provided supply.
Contact 1
Contact 8
