Facing the serial port’s connector pins, the pinout is:

9

7

5

3

1

GND

DTR

TXD

RXD

DCD

GND

RI

CTS

RTS

DSR

10

8

6

4

2

RS-422 or RS-485 Serial Port

You may use Setup to configure the serial ports as RS-422 or RS-485. In this case, you must connect the serial port to an RS-422 or RS-485 compatible device.

When using RS-422 or RS-485 mode, you can use the serial ports in either half-duplex (two-wire) or full-duplex (four-wire) configurations. For half-duplex (2-wire) operation, you must connect RXD+ to TXD+, and connect RXD– to TXD–.

Note The cpuModule has a 120 Ω termination resistor. Termination is usually necessary on all RS-422 receivers and at the ends of the RS-485 bus.

Note If required, the termination resistor can be enabled by closing jumper JP1 for Serial Port 1 (COM1),JP2 for Serial Port 2 (COM2), JP11 for Serial Port 3 (COM3), and JP13 for Serial Port 4 (COM4).

When using full-duplex (typically in RS-422 mode), connect the ports as shown in Table 19.

Table 19 Full-Duplex Connections

Port 1

Port 2

 

 

RXD+

TXD+

 

 

TXD+

RXD+

 

 

RXD–

TXD–

 

 

TXD–

RXD–

 

 

When using half-duplex in RS-485 mode, connect the ports as shown in Table 20.

Table 20 Half-Duplex RS-485 Mode

From

To

 

 

Port 1 TXD+

Port 1 RXD+

 

 

Port 1 TXD–

Port 1 RXD–

 

 

Port 1 TXD+

Port 2 RXD+

 

 

Port 1 RXD–

Port 2 TXD–

 

 

38 CMX158886 cpuModule

BDM-610000049 Rev G

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Image 48
IBM BDM-610000049 user manual RS-422 or RS-485 Serial Port, Full-Duplex Connections, Half-Duplex RS-485 Mode, From

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