Specifications

30 PCL-846/847 Series User's Manual

Pin assignments

The following figures show the pin assignments for the card's DB-9

connectors in RS-422 and RS-485 modes.

Pin description (DB-9 male)

1 TX-(DATA-) or send data - (DTE)

2 TX+(DATA+) or send data + (DTE)

3 RX+ or receive data + (DTE)

4 RX - or receive data - (DTE)

5 GROUND

6 RTS - or ready to ssend -

7 RTS+ or ready to send +

8 CTS+ or clear to send +

9 CTS- or clear to send -

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:

PCL-846/847 DTE (Male DB-9) Terminal DTE

Pin Signal Signal

1 TxD- RxD-

2 TxD+ RxD+

3 RxD+ TxD+

4 RxD- TxD-

5 GND GND

6 RTS- CTS-

7 RTS+ CTS+

8 CTS+ RTS+

9 CTS- RTS-

RS-422

RS-485