Gill MaxiMet GMX200, Руководство пользователя

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Gill Instruments Ltd
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MaxiMet
Page 20 Issue 1
Doc. No. 1957-PS-000x March 2015
4.6. Connecting to a PC using RS232 (Default setting)
1. MaxiMet default factory comms setting is RS232.
2. The recommended cable length for reliable operation is limited to 6.5m (20ft).
3. For longer cable runs, we recommend use of RS422 output.
4. As an alternative method of using MaxiMet with RS232 comms change the COMMS setting
from RS232 to EXT and connect Pin 8 to the +ve supply connection (dotted line connection).
5. If EXT is selected and Pin 8 is left open circuit then note that RS422 comms will be set.
MaxiMet
9 Way Connector
PC, Typical 9 Way ‘D’
Connector
Signal names
Pin
nos.
Cable – 3
twisted pairs
Signal
names
Pin no's
TXD-
RXD-
5
7
RXD
TXD
2
3
Signal Ground 1
Signal
Ground
5
Not connected this
end
N/A Screen and
drain wires
Chassis
ground
N/A
Comms 8
V
V supply -
2
3
+
-
DC Power supply
4.7. Connecting to a PC using RS422 (Not a Default Setting)
1. MaxiMet default factory comms setting is RS232.
2. To use the MaxiMet with RS422 comms use MetSet to change the COMMS Interface
setting to RS422.
3. Alternatively use MetSet to change the COMMS Interface setting to EXT and leave
connector Pin 8 open circuit.
4. If EXT is selected and Pin 8 connected to Pin 2 supply positive then COMMS will change
to RS232.
MaxiMet
9 Way Connector
PC with RS422
converter
Signal names
Pin
nos.
Cable – 4 twisted pairs Signal names
TXD+
TXD –
4
5
RXD +
RXD –
RXD+
RXD –
6
7
TXD +
TXD –
Signal Ground
1
Signal Ground
Not connected
this end
Comms
N/A
8
Screen and drain wires Chassis ground
V
V supply -
2
3
+
–
DC Power
supply