S-COM 6K Owner's Manual page 13

voltage is normally higher than 5 V and is pulled down by the controller, or if the receiver COR
cannot pull down the input below 2 V, then you should clip one lead of the pullup resistor and lift it
from the board to prevent its making contact.
The 6K's Repeater Receiver COR input is pin 6 of J2.
The last step is to determine the "sense" of your receiver's COR signal. Does the COR signal go
"low" or "high" when an incoming carrier is detected? If the COR output goes "low" when a carrier is
applied and returns "high" when the carrier is removed, then place dip switch #1 (part of S2) in the
ON, (closed) position. If, however, the COR output goes "high" when a carrier is applied and
returns "low" when the carrier is removed, then place dip switch #1 in the OFF (open) position.
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6K V1.02 03-16-91