7
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 RR-482D-1470/1490 unit 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 RR-482D-1470/1490 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.
The RR-482D-1470/1490 is shipped with these switches in the off position. When transmitting
RS232 or Manchester data, the bias and termination switches must remain in the off position.
The chart on the next page describes the layout of the S1 switch bank. The switch bank for data
channel 2 follows the same pattern.