Advantech PCL-746+, Руководство пользователя

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Chapter 5 Wiring 29
Modem connections
DB-25 Male: PCL-746+ Modem (DCE)
Pin Signal Pin Signal
2 TxD 2 RxD
3 RxD 3 TxD
4 RTS 4 CTS
5 CTS 5 RTS
6 DSR 6 DTR
7 GND 7 GND
20 DTR 20 DSR
8 DCD 8 DCD
For DTE to DCE connection, use straight through cable, i.e. you don't
have to reverse lines 2 and 3, lines 4 and 5, and lines 6 and 20. Because
in general the DCE RS-232 interfaces are reversed themselves.
Terminal without handshake
DB-25 Male: PCL-746+ Terminal, PC (DTE)
Pin Signal Pin Signal
2 TxD 3 RxD
3 RxD 2 TxD
4 RTS —
5 CTS —
7 GND 7 GND
6 DSR —
20 DTR —
8 DCD —
The maximum length of a RS-232 cable is 100 ft. If you need to connect
over longer distances, (longer than 100 ft), please use RS-422 or RS-
485 modes to match this requirement.
If not using CTS, RTS, DSR ,DTR signals, please loop back for the PC-
ComLIB software to function correctly, because PC-ComLIB will
always check for handshake signals.