American Fibertek RR-94085SL - Manual (Page 8)

8
DATA MODE
NOTE: This unit shipped with Data Mode switches in the RS485 4-wire position.
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 on the front
of the unit and can be modified without opening the unit. Please note that switch # 1 and switch
# 2 are not used and should remain in the off (up) position.
DATA TERMINATION / BIAS
NOTE: This unit is shipped with Data Termination and Bias switches in the off position.
Switches are available on the back of the unit next to the data connections that allow offset bias
and termination features to be activated. In a majority of cases, bias will not be required and
these switches should remain in the up position. For an explanation of RS485 biasing please
refer to the OFFSET BIAS – RS485 section. Use of bias and termination switches varies for
each data format. Please refer to the drawings below and on the next page for the possible
switch settings for each format. When transmitting RS232 or Manchester data, the bias and
termination switches must remain in the off (up) position.
RS422 termination switch settings: