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Model 400E Ozone Analyzer
Instruction Manual
6.9.3. COM-B RS-232/485 Configuration
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-485 port set switch 6 of SW1 to the ON
position(see Figure 6-7).
•
The RS-485 port can be configured with or without a 150 O termination
resistor. To include the resistor, install jumper at position JP3 on the CPU
board (see Figure 6-7). To configure COM2 as an un-terminated RS-485 port
leave JP3 open.
Figure 6-7: CPU card Locations of RS-232/486 Switches, Connectors and Jumpers
P/N 04316 Rev: B
JP3
CN5
COM2 – RS-485
CN4
COM2 – RS-232
SW1
Pin 6
Operating Instructions
CN3
COM1 – RS-232
117
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