Advantech PCI-1612 Manual de usuario descargar pdf (Pagina 75)

65 PCI/ PCI Express-Communication User Manual

Chapter 5 Pin Assignments and Wiring

For DTE to DCE connections, use a 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, short pins 4 and 5

together, and please short pins 6, 8,and 20 together.

5.2.2 RS-422 Signal Wiring

The RS-422 interface wiring is based on one-to-one principles. The transmit lines on

one side connect to the receive lines on the other side, and vice versa. With RS-422,

you can transmit and receive data simultaneously (full duplex). The connections are

as follows:

Terminator Resistors Setup

The signals DSR, DTR and DCD are shorted internally on the PCI-1601/1602/1611/

1612/1622 cards when operating in RS-422 mode.

A user can solder in termination resistors if necessary for impedance matching. The

card has two mounting spaces for termination resistors, but no resistors are installed

at the factory. Each pair of signal lines has a separate resistor (RxD+/-, TxD+/-).

Table 5.20: Terminal without Handshake

DB-25 Male Terminal, PC (DTE)

Pin Signal Pin Signal

2TxD 3RxD

3RxD 2TxD

RTS

CTS

7 GND 7 GND

DSR

DTR

DCD

Table 5.21: RS-422 DB9 Pin Assignment

DTE (Male DB-9) Terminal DTE

Pin Signal Pin Signal

1TxD- 1 RxD-

2TxD+ 2 RxD+

3RxD+ 3 TxD+

4RxD- 4 TxD-

5 GND 5 GND

6RTS- 6 CTS-

7RTS+ 7 CTS+

8CTS+ 8 CTS+

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

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Advantech PCI-1612 Manual de usuario Pagina 75