Advantech PCI-1612 Manuel d'utilisateur télécharger pdf (Page 74)

PCI/ PCI Express-Communication User Manual 64

5.2 Wiring

5.2.1 5.2.1 RS-232 Signal Wiring

Since the RS-232 interface is not strictly defined, many devices have their own con-

nection 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 controlled. 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 sig-

nal ground and a handshaking line. Examples are printer or plotter connections, trou-

bleshooting and situations where you require only one-wire communication.

Table 5.18: 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

7GND7GND

20 DTR 6 DSR

8 DCD 8 DCD

Table 5.19: Modem Connections

DB-25 Male Modem (DCE)

Pin Signal Pin Signal

2 TxD 3 RxD

3RxD 2 TxD

4RTS 5 CTS

5CTS 4 RTS

6DSR 20 DTR

7 GND 7 GND

20 DTR 6 DSR

8DCD 8 DCD

1 2 ... 69 70 71 72 73 74 75 76 77 78

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Advantech PCI-1612 Manuel d'utilisateur Page 74