American Fibertek RR-91685SL - Manual (Page 8)

8
DATA CONFIGURATION SWITCHES
NOTE: This unit is shipped with Data Channel 1 and Data Channel 2 in the RS485 4-wire
configuration.
For other configurations of data channel 1 or data channel 2, please refer to the drawing below
for changes to the default switch settings. These configuration switches are located at the
bottom of the RT-482-1470/1490 and RR-82-1470/1490 units and can be modified without
opening the unit.
DATA TERMINATION AND BIAS SWITCHES
NOTE: This unit is shipped with data terminations off and data bias off for Data Channel
1 and Data Channel 2. For other configurations, please refer to the DATA TERMINATION
AND BIAS section on the next page for changes to the default switch settings.
Switches are available internally on the RT-482-1470/1490 and RR-82-1470/1490 units that
allow offset bias and termination features to be activated when using RS485 data. These
switches also allow termination features to be activated when using RS422 data. In order to
reconfigure the RS485/422 channel, the rack card cover needs to be removed. To access the
switches, remove the four screws on the top of the cover. The configuration switch banks are
located next to their corresponding data terminal block connector.