RS-422 Connections

APPENDIX B: RS-422 CONNECTIONS

Serial Server DB-9 Pin-outs in RS-422 Mode

 

 

 

 

RS-422

 

 

DB9M

Signal Name

Direction

RS-422

Pin

Receive Data A (−)

In

RXDA (−)

1

Receive Data B (+)

In

RXDB (+)

2

Transmit Data B (+)

Out

TXDB (+)

3

Transmit Data A (−)

Out

TXDA (−)

4

Signal Ground

---

GND

5

Clear to Send A (−)

In

CTSA (−)

6

Clear to Send B (+)

In

CTSB (+)

7

Request to Send B (+)

Out

RTSB (+)

8

Request to Send A (−)

Out

RTSA (−)

9

Figure 66. RS-422 Connections in a DB-9 Connector

Manual Documentation Number: ESP901-902_4105m

Appendix B

75

RS-422 Connections

Serial Server pin-out

 

 

RS-422

in RS-422 mode

 

 

Device

RS-422 Signal Names

DB-9

Connections

Signal

 

 

Pin#

 

 

Receive A (-)

RXDA(-)

1

 

TDA(-)

Receive B (+)

RXDB(+)

2

 

TDB(+)

Transmit B (+)

TXDB(+)

3

 

RDB(+)

Transmit A (-)

TXDA(-)

4

 

RDA(-)

Ground

GND

5

 

GND

 

Clear to Send A (-)

CTSA(-)

6

 

RTSA(-)

Clear to Send B (+)

CTSB(+)

7

 

RTSB(+)

Ready to Send B (+)

RTSB(+)

8

 

CTSB(+)

Ready to Send A (-)

RTSA(-)

9

 

CTSA(-)

Figure 67. RS-422 Connections with Flow Control

In the RS-422 mode, TXD lines are outputs and RXD lines are inputs. Connect the Serial Server TXDB(+) line to the RXDB(+) line of the serial device, and the Serial Server TXDA(-) to the RXDA(-) of the serial device.

If Flow Control is set for RTS/CTS, connect the Serial Server RTSB(+) to CTSB(+) of the serial device and the Serial Server RTSA(-) line to the CTSA(-) of the serial device. Connect from the Serial Server CTSB(+) line to the RTSB(+) of the serial device and from the Serial Server CTSA(-) line to the RTSB(+) line of the serial device.

If connecting to Receive Only RS-422 devices, connect from the Serial Server TXDB(+) and TXDA(-) lines to the receive pairs on all serial devices.

Ground is signal ground and provides a common mode reference for the RS-422 Receiver and Transmitters.

Note:

The RS-422 mode can be used for full duplex 4-wire RS-485 operation provided that the serial server is acting as a sole master connecting to all the slave devices, and all slave devices share the Receive signal lines to the master. Set Flow Control for none, and omit connections to RTS/CTS line pairs.

76

Appendix B

Manual Documentation Number: ESP901-902_4105m

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

– www.bb-elec.com

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

– www.bb-elec.com

B&B Electronics Ltd – Westlink Commercial Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445

– www.bb-europe.com

B&B Electronics Ltd – Westlink Commercial Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445

– www.bb-europe.com

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B&B Electronics RS-232, RS-485 manual Appendix B RS-422 Connections, Serial Server DB-9 Pin-outs in RS-422 Mode
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RS-422, RS-232, RS-485, Multi-Interface Ethernet Serial Servers specifications

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