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M400E Ozone Analyzer Operator’s Manual 357BRemote Operation Of The M400E
8.3. RS-485 CONFIGURATION OF COM2
As delivered from the factory, COM2 is configured for RS-232 communications. This port can be re-configured
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 Instruments Customer Service.
To reconfigure
COM2 as an RS-285 port set switch 6 of SW1 to the ON position (see Figure 8-7).
The RS-485 port can be configured with or without a 150 Ω termination resistor. To include the resistor,
install jumper at position JP3 on the CPU board (see Figure 8-7). To configure COM2 as an un-
terminate
d RS-485 port leave JP3 open.
SW1
Pin 6
CN5
COM2 – RS-485
JP3
CN4
COM2 – RS-232
CN3
COM1 – RS-232
Figure 8-5: CPU card Locations of RS-232/485 Switches, Connectors and Jumpers
04315 Rev. C1 131