User`s guide

AR-B1476 User’s Guide

3-8

(3) RS-485 Connector (J4)

J4 is onboard RS-485 header, J4 pin assignments are as follows:

123

1 N485+

2 N485-

3 GND

J4 (COM B)

Figure 3-16 J4: RS-485 Connector

(4) RS-232 Connector (CN5 & DB2)

There are two serial ports with EIA RS-232C interface on the AR-B1476. COM A uses one onboard D-type 9 pin

male connector (DB2) and COM B uses one 10 pin header (CN5) which are located at the right side of the card.

To configure these two serial ports, use the BIOS Setup program, and adjust the jumpers on JP4 and JP9.

The pin assignments of the DB2 and CN5 for serial port A & B are as follows:

DB2 (COM A) CN5 (COM B)

6-DSR

7-RTS

8-CTS

9-RI

1-DCD

2 RXD

3 TXD

4-DTR

5 GND

Figure 3-17 DB2 & CN5: RS-232 Connector

CN5 DB2 Signal CN5 DB2 Signal

1 1 -DCD 2 6 -DSR

3 2 RXD 4 7 -RTS

5 3 TXD 6 8 -CTS

7 4 -DTR 8 9 -RI

9 5 GND 10 -- Not Used

Table 3-5 RS-232 Connector Pin Assignment