American Fibertek MRX-8885C - Manual (Page 6)

6
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 with data
input and output termination resistors in and no offset bias.
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
RS485 FOUR WIRE SWITCH SETUP
The following is an illustration of the data configuration switches that identifies the specific
switch function and up/down direction for RS485 four wire transmission.