Advantech PCL-740 User Manual Page 77

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67 Chapter 5
5.2 Wiring
5.2.1 RS-232 Signal Wiring
Since the RS-232 interface is not strictly defined, many devices have their
own connection methods, which may ignore some signal lines or define
reserved lines for other functions. It is best to refer to the users manual of
your device for installation instructions. You may find the following
helpful.
In general, DTE (Data Terminal Equipment) refers to the device that is
leading the communication. Examples include PCs, terminals and some
printers. DCE refers to the device being communicated with or con-
trolled. Examples include modems, DSUs (digital service units), printers
and lab/factory equipment.
In some situations you may be able to get by with just three lines: data on
TXD, Rxd, and a signal ground.
Table 5.2: Terminal or PC (DTE) connections
DB-25 Male DB-25 Male or Female: Terminal
Pin Signal Pin Signal
2TxD 3 RxD
3 RxD 2 TxD
4RTS 5 CTS
5CTS 4 RTS
6DSR 20 DTR
7GND 7 GND
20 DTR 6 DSR
8 DCD 8 DCD
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