RS-422 and RS-485 Mode Pinout

Table 21 provides the serial port connector pinout when RS-422 or RS-485 modes are enabled.

Table 21 Serial Port in RS-422/485 Mode

Pin

Signal

Function

In/Out

DB-9

 

 

 

 

 

1

Reserved

1

 

 

 

 

 

2

Reserved

6

 

 

 

 

 

3

RXD–

Receive Data (–)

in

2

 

 

 

 

 

4

TXD+

Transmit Data (+)

out

7

 

 

 

 

 

5

TXD–

Transmit Data (–)

out

3

 

 

 

 

 

6

RXD+

Receive Data (+)

in

8

 

 

 

 

 

7

Reseved

4

 

 

 

 

 

8

Reseved

9

 

 

 

 

 

9,10

GND

Signal Ground

out

5

 

 

 

 

 

Facing the serial port connector, the pinout is:

9

7

5

3

1

GND

Rsvd

TXD-

RXD-

Rsvd

 

 

 

 

 

GND

Rsvd

RXD+

TXD+

Rsvd

 

 

 

 

 

10

8

6

4

2

Note When using the serial port in RS-485 mode, the serial transmitters are enabled and disabled under software control. The transmitters are enabled by manipulating the Request To Send (RTS*) signal of the serial port controller. This signal is controlled by writing bit 1 of the Modem Control Register (MCR) as follows:

If MCR bit 1 = 1, then RTS* = 0, and serial transmitters are disabled

If MCR bit 1 = 0, then RTS* = 1, and serial transmitters are enabled

Note For more information on the serial port registers, including the MCR, refer to the Serial Port Programming reference in Appendix D.

BDM-610000049 Rev G

Chapter 3: Connecting the cpuModule 39

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IBM BDM-610000049 Serial Port in RS-422/485 Mode, Pin Signal Function In/Out DB-9, Transmit Data +, Receive Data + Reseved

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