Universal PCI Board
Hardware Installation
2-6
Onboard termination resistors can be activated individually for each serial port using jumpers JP1 through JP4.
For CP-114UL, JP1/2/3/4 corresponds to serial port 1/2/3/4, respectively. For CP-114UL-I, JP1/2/3/4
corresponds to serial port 4/3/2/1, respectively. 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. Switches 1 through 4 on each bank correspond to the 4 serial ports. S3 selects between RS-232 and
RS-422/485, S2 selects between RS-422 and RS-485, and S1 selects between 2-wire and 4-wire RS-485, as
follows:
Mode
S1
S2
S3
RS-232
---
---
ON
RS-422
---
ON
OFF
4-wire RS-485
ON
OFF
OFF
2-wire RS-485
OFF
OFF
OFF
