RS-232 Connections

APPENDIX A: RS-232 CONNECTIONS

Serial Server DB-9 Pin-outs in RS-232 Mode

 

 

 

 

RS-232

DTE

RS-232

DB-9M

Signal Name

 

 

Pin

Carrier Detect

In

DCD

1

Receive Data

In

RXD

2

Transmit Data

Out

TXD

3

Data Terminal Ready

Out

DTR

4

Signal Ground

---

GND

5

Data Set Ready

In

DSR

6

Request To Send

Out

RTS

7

Clear To Send

In

CTS

8

Ring Indicator

In

RI

9

Figure 60. RS-232 Connections in a DB-9 Connector

Manual Documentation Number: ESP901-902_4105m

Appendix A

71

RS-232 Connections

RS-232 Straight-through Cable Connections

In the RS-232 mode, the Serial Server’s ports are configured as DTEs like a computer. If the device connected to the Serial Server is configured as a DCE use a straight through cable wired as shown below:

RS-232 Signal Names

 

DB-9

Connections

DB-9

Signal

 

 

 

Pin#

 

Pin#

 

Carrier Detect

 

CD

1

 

1

CD

Receive Data

 

RD

2

 

2

RD

Transmit Data

 

TD

3

 

3

TD

Data Terminal Ready

 

DTR

4

 

4

DTR

Signal Ground/Common

 

GND

5

 

5

GND

Data Set Ready

 

DSR

6

 

6

DSR

Request to Send

 

RTS

7

 

7

RTS

Clear to Send

 

CTS

8

 

8

CTS

Ring Indicator

 

RI

9

 

9

RI

Figure 61. Straight-through DB-9 to DB-9 RS-232 Serial Cable

RS-232 Crossover (null modem) Cable Connections

When connecting to a PC or another DTE device, use a crossover cable (also called a null modem cable).

RS-232 Signal Names

 

DB-9

Connections DB-9 Signal

 

 

Pin#

Pin#

 

Carrier Detect

CD

1

1

CD

Receive Data

RD

2

2

RD

Transmit Data

TD

3

3

TD

Data Terminal Ready

DTR

4

4

DTR

Signal Ground/Common

GND

5

5

GND

Data Set Ready

DSR

6

6

DSR

Request to Send

RTS

7

7

RTS

Clear to Send

CTS

8

8

CTS

Ring Indicator

RI

9

9

RI

Figure 62.Crossover DB-9 to DB-9 RS-232 Serial Cable

72

Appendix A

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

Page 40
Image 40
B&B Electronics RS-485, RS-422 manual Serial Server DB-9 Pin-outs in RS-232 Mode, RS-232 Straight-through Cable Connections

RS-422, RS-232, RS-485, Multi-Interface Ethernet Serial Servers specifications

B&B Electronics is renowned for its reliable and efficient solutions for industrial communication, and their Multi-Interface Ethernet Serial Servers stand out as versatile tools for connecting legacy serial devices to modern Ethernet networks. The compatibility with various serial communication protocols, including RS-485, RS-232, and RS-422, makes these servers indispensable in numerous applications that require reliable data transfer.

One of the main features of B&B Electronics Multi-Interface Serial Servers is their ability to support multiple serial communication standards. This flexibility allows businesses to integrate older equipment with newer technologies seamlessly. The servers can act as a bridge, ensuring that data from RS-232 devices can be transmitted over Ethernet networks without modification.

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In summary, B&B Electronics Multi-Interface Ethernet Serial Servers serve as a crucial link between legacy serial devices and modern Ethernet networks. Their flexibility, robust design, and user-friendly features make them a preferred solution for industries looking to improve their communications infrastructure and streamline their operations. With the integration of cutting-edge technologies, these servers not only meet the current demands but also adapt to future advancements in network communications.