SLC 500 BASIC and BASIC-T Modules 13
Publication 1746-IN009B-EN-P - August 2005
Wire the PRT1 and PRT2 Communication Ports
Ports PRT1 and PRT2 can communicate to user devices through RS-232/423, RS-422,
and RS-485 communication modes. The communication mode you select depends
on the setting of jumpers JW1 and JW2. Refer to the MODE command in the BASIC
Reference Manual, publication 1746-RM001, for the default programming port
configuration information.
Pin Assignments
Use these pin assignments to wire the mating connector of the cable used to
interface a user device to port PRT1 or PRT2. The sockets of this connector must be
wired to correspond to the selected communication mode.
Wiring diagrams for the RS-232/423 communication mode are shown starting on
page 16.
IMPORTANT
When default communications are selected via JW4, the module
always powers up in the Command mode at 1200 bps, no parity, 8
data bits, and 1 stop bit.
Pin RS-232/423 RS-422 RS-485 IBM AT Standard
RS-232 Signals
1 Note 1 422 TXD - TRXD - DCD or CD
2 RXD 422 RXD -
(3)
(3) In RS-485 mode, these pins are still connected to their RS-422 receivers. Do not use these pins in RS-485 mode.
RXD
3 TXD
(2)
(2) In RS-422 and RS-485 modes, these pins are connected to their RS-423 drivers and receivers. Do not use these pins in
either RS-422 or RS-485 mode.
(2)
TXD
4 DTR
(2) (2)
DTR
5 COMMON COMMON COMMON COMMON
6 DSR 422 RXD +
(3)
DSR
7 RTS
(2) (2)
RTS
8 CTS
(2) (2)
CTS
9
(1)
(1) In RS-423 mode, these pins are still connected to their RS-422 loads. Do not use these pins in RS-423 mode.
422 TXD + TRXD + RI
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