Universal PCI Board
Hardware Installation
2-10
CP-112UL/CP-112UL-I
Onboard termination resistors can be activated individually for each serial port using jumpers JP1 and JP2. JP1
corresponds to serial port 1. Short the jumper pins to activate the termination resistor; leave the jumper pins
open to bypass the termination resistor. The onboard DIP switches, S1, S2, and S3, are used to select RS-232,
RS-422, or RS-485 mode for each serial port. Switch 1 corresponds to port 1 and switch 2 corresponds to port
2. S1 selects between RS-232, S2 selects between RS-422, and S3 selects between 2-wire and 4-wire RS-485,
as follows:
Mode
S1
S2
S3
RS-232
ON
--
--
RS-422
OFF
ON
--
4-Wire RS-485
OFF
OFF
ON
2-Wire RS-485
OFF
OFF
OFF
