American Fibertek MRX-8485, Инструкция по эксплуатации

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The figure below identifies the specific connections for the RS422 / RS232 data
connections.
DATA CONFIGURATION
This link accommodates transmission of:
1) 1 bi-directional RS485 (2 wire or 4 wire) data channel, or
2) 1 bi-directional RS422 data channel, or
3) 1 bi-directional RS232 data channel, or
4) 1 bi-directional RS232 data channel and 1 bi-directional RS422 data channel.
These units are factory shipped configured for RS485 (4 wire) configuration.
There is a rear panel data configuration switch bank which is available to select:
1) RS485 or RS422/RS232 data modes
2) RS485 (2 or 4 wire) format
3) Internal data input/output terminations
4) RS485 Offset Bias Option