Rs-422 Mode - B&B Electronics Port Expander 232PE User Manual

Figure 5. Simplified RS-422/485 Schematic
When a port has this option, an additional printed circuit board
will be mounted to the main board. Use Figure 2 to locate its
position. Refer to Table 3 for pin out, signal name, and signal
direction information. Also, refer to Figure 5 for a simplified
schematic showing the relationship between the master port and a
port configured with the RS-422/485 option.
NOTE: This option only supports transmit and receive data signals
(TD & RD) from the master port.
Refer to Appendix B for cable charts.

RS-422 Mode

To configure the port for RS-422 four-wire mode, five jumpers
must be set. Jumper JP1 must be placed in the "SD" position.
Both JP2 jumpers must be placed in the four-wire "4W" position.
Jumper JP3 must be place in the "ON" position. Jumper JP4
should be placed in the "ON" position. Refer to Figure 6 for these
jumper locations.
232PE3095 Manual
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