Using the Aux Port
The RS-232 aux port can be used to communicate to a secondary PLC. The setup screen for the aux port can be
found as a tab option under the Edit-System Parameters menu selection.
The AUX port isnot available in the HMI504T.
PLC [RS-232] + AUX [RS-232] Port
Pin Designations
Pin assignment of the 9-pin, female Sub-D, PLC [RS-232] Port
Pin # Symbol PLC [RS-232] AUX [RS-232]
1 Aux_TxD Transmitted Data
2 TxD Transmitted Data
3 RxD Received Data
4 Not used
5 GND Signal Ground
6 Aux_RxD Received Data
7 CTS Clear to send input
8 RTS Ready to send output
9 Not used
1010-1001a, Rev 02
76 Sil ver Se ries In stal la tion & Op er a tion Man ual
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