American Fibertek MRX-8889C - Manual (Page 6)

6
DATA CONFIGURATION SWITCHES
This link accommodates transmission of:
1) 1 bi-directional RS422 data channel, or
2) 1 bi-directional Contact Closure channel, or
3) 1 bi-directional RS422 data channel and 1 bi-directional Contact Closure channel, or
4) 1 bi-directional RS485 (2 wire or 4 wire) data channel.
These units are factory shipped configured for RS422 / Contact Closure operation.
There is a rear panel data configuration switch bank which is available to select:
1) RS422/Contact Closure or RS485 data modes
2) Internal data input/output terminations
3) RS485 (2 or 4 wire) format
4) RS485 Offset Bias Option
RS422 / CONTACT CLOSURE SWITCH SETUP
Below is an illustration of the data configuration switches that identifies the specific switch
function and up/down direction for RS422 / Contact Closure transmission.