Advantech PCI-1612 Manuel d'utilisateur télécharger pdf (Page 104)

PCI-COMMUNICATION User Manual 94

5.2.2 RS-422 Signal Wiring

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

mit 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 simulta-

neously (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 5.31: RS-422 DB9 Pin Assignment

DTE(Male DB-9) Terminal DTE

Pin Signal Pin Signal

1 TxD- 1 RxD-

2 TxD+ 2 RxD+

3RxD+ 3 TxD+

4RxD- 4 TxD-

5 GND 5 GND

6RTS- 6 CTS-

7RTS+ 7 CTS+

8CTS+ 8 RTS+

9CTS- 9 RTS-

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

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Advantech PCI-1612 Manuel d'utilisateur Page 104