Advantech PCI-1612 Manuel d'utilisateur télécharger pdf (Page 102)

PCI-COMMUNICATION User Manual 92

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 user’s manual

for 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 PC’s, terminals and some

printers. DCE refers to the device being communicated with or con-

trolled. Examples include modems, DSU’s (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, a signal ground and a handshaking line. Examples are printer or

plotter connections, troubleshooting and situations where you require

only one-wire communication.

Table 5.28: Terminal or PC (DTE) Connections

DB-25 Male DB-25 Male or Female: Terminal

Pin Signal Pin Signal

2 TxD 3 RxD

3 RxD 2 TxD

4 RTS 5 CTS

5 CTS 4 RTS

6DSR20DTR

7 GND 7 GND

20 DTR 6 DSR

8 DCD 8 DCD

1 2 ... 97 98 99 100 101 102 103 104 105 106

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Advantech PCI-1612 Manuel d'utilisateur Page 102