User`s manual

Chapter 2 Hardware Configuration

Page: 2-6

PMB-1751LF USER'S MANUAL

2-4. COM PORT CONNECTOR

Four COM ports are enhanced in this board namely: JCOM1, COM2,

COM3 and COM4. JCOM1, COM3 and COM4 are fixed for RS-232

while COM2 is selectable for RS-232/422/485.

JCOM1 : COM1 Connector, DB9 male connector

The JCOM1 Connector assignments are as follows :

PIN ASSIGNMENT

1 NDCD1

2 RXD1

3 TXD1

4 NDTR1

5 GND

6 NDSR1

7 NRTS1

8 NCTS1

9 NRI1

COM2 : COM2 Connector

The COM2 Connector assignments are as follows :

ASSIGNMENT

RS-232 RS-422 RS-485

1 NDCD2 TX- TX-

2 RXD2 TX+ TX+

3 TXD2 RX+ RX+

4 NDTR2 RX- RX-

5 GND GND GND

6 NDSR2 RTS- NC

7 NRTS2 RTS+ NC

8 NCTS2 CTS+ NC

9 NRI2 CTS- NC

10 NC NC NC

JCOM 1