Titan ProPAC-3 Manual page 45

The ProPAC-3 motherboard has several communication jumpers on the upper center section of the board.
The following chart defines the jumpers and their functions:
Standard
Extra Serial
Serial
Port
Port
JP5 JP 12
JP8 JP 13
JP3 JP 10
JP4 JP 11
Communications Configuration
Connects a 120 ohm termination resistor across R+ and R- for 4-
wire communications and across D+ and D- for 2-wire
communications. Recommended for communication rates higher
than 9600 baud or network cable lengths that exceed 1000 feet.
Install only on the last injector on a network.
C onnects signal ground to DC ground. This is generally not
recommended.
Connects R- to T-. C onverts P roPAC-3 to 2-wire R S-485
communications. D- connector becomes either the T- or R-
terminal.
Connects R+ to T+. C onverts P roPAC-3 to 2-wire R S-485
communications. D+ connector becomes either the T+ or R+
terminal.
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Function