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DIP Switch / Mode Settings

A-4 Appendix A Document Number 3PCI-4310m

Setting the DIP Switches on RS-232/422/485 Ports

Set the DIP switches to configure the desired operating mode as follows:

422/485

TX On

RX On

232

TX SD

RX SD

Switch 1

Switch 2

Switch 3

RS-232 Mode

422/485

TX On

RX On

232

TX SD

RX SD

RS-422 Mode

422/485

TX On

RX On

232

TX SD

RX SD

4-wire RS-485 Mode

422/485

TX On

RX On

232

TX SD

RX SD

2-wire RS-485 Mode

Figure 25. RS-232/422/485 DIP Switch Settings.

DIP Switch 1 (RS-232/422/485 ports)

The top DIP switch (1) configures the port for RS-232 or RS-422/485 operation. This

switch is the only one that is required to be set for RS-232 operation. The positions of

switches 2 and 3 do not matter when switch 1 is set for RS-232 operation.

DIP Switch 2 (RS-232/422/485 ports)

The middle DIP switch (2) configures the port for RS-485 or RS-422 operation. For RS-

422 operation (which uses two wire pairs and sends point-to-point or point-to-

multipoints) the transmitter can be enabled all the time. Placing the middle DIP switch in

the TX ON position accomplishes this.

For RS-485 operation the middle DIP switch is placed in the TX SD position. In this

position the transmitter is only enabled when data is being sent. The transmitter is tri-

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