Moxa CP-112UL-T [14/131] Cp 138u cp 138u i

Universal PCI Board Hardware Installation

2-3

Onboard termination resistors can be activated individually for each serial port using jumpers JP1 through JP8.

For CP-118U-I, JP1/2/3/4/5/6/7/8 corresponds to serial port 1/2/3/4/5/6/7/8, respectively. For CP-118U,

JP1/2/3/4/5/6/7/8 corresponds to serial port 8/7/6/5/4/3/2/1, 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. There are 8 switches on each bank corresponding to the 8 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

CP-138U/CP-138U-I