Advantech PCI-1625U Uživatelský manuál stáhnout pdf (Strana 51)

43 Chapter 5

For DTE to DCE connections, 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 since, in

general, the DCE RS-232 interfaces are reversed themselves).

Therefore, if you are not using CTS, RTS, DSR, DTR and DCD signals,

please short pins 4 and 5 together, and please short pins 6, 8, and 20

together.

Table 5.6: Modem Connections

DB25 Male Modem (DCE)

Pin Signal Pin Signal

2 TxD 2 RxD

3 RxD 3 TxD

4 RTS 4 CTS

5 CTS 5 RTS

6DSR 6 DTR

7 GND 7 GND

20 DTR 20 DSR

8 DCD 8 DCD

Table 5.7: Terminal without Handshake

DB-25 Male Terminal, PC (DTE)

Pin Signal Pin Signal

2 TxD 3 RxD

3RxD 2 TxD

RTS —

CTS —

7 GND 7 GND

DSR —

DTR —

DCD —

1 2 ... 46 47 48 49 50 51 52

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Advantech PCI-1625U Uživatelský manuál Strana 51