Appendix a: dip switch/mode settings, Etting the, Witches on – B&B Electronics 3PCIOU4 - Manual User Manual
Page 48: Rs-232/422/485, Orts, Dip switch 1 (rs-232/422/485 ports), Dip switch 2 (rs-232/422/485 ports)
DIP Switch / Mode Settings
A-4
Appendix A
Document Number 3PCI-0712m
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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-