Teledyne M300EM operation manual 8.3.RS-485CONFIGURATION OF COM2, 5:CPU RS-485Setup

Remote Operation Teledyne API – Technical Manual - Model 300E Family CO Analyzers

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 API’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.

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