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Remote Operation Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 162
8.3. RS-485 CONFIGURATION OF COM2
As delivered from the factory, COM2 is configured for RS-232 communications. This port can be reconfigured
for operation as a non-isolated, half-duplex RS-485 port capable of supporting up to 32 instruments with a
maximum distance between the host and the furthest instrument being 4000 feet. If you require full duplex or
isolated operation, please contact Teledyne’s Customer Service.
To reconfigure COM2 as an RS-485 port:
Locate J32 and move the shunt from Pins 1 2 to Pins 3 4.
Remove the connector from J12.
Plug the RS-485 connector into J15.
Figure 8-5: CPU RS-485 Setup
When COM2 is configured for RS-485 operation the port uses the same female DB-9 connector on the back of
the instrument as when COM2 is configured for RS-232 operation, however, the pin assignments are different.