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: ESP901-902-3704

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: ESP901-902-3704

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 ESP902E, ESP901E Serial Server DB-9 Pin-outs in RS-232 Mode, RS-232 Straight-through Cable Connections

ESP902E, ESP902, ESP901E specifications

B&B Electronics offers a series of industrial-grade Ethernet serial servers known as the ESP901E, ESP902, and ESP902E. These devices are specifically designed to connect serial devices to an Ethernet network seamlessly, enabling effective communication and data transfer across various applications.

The ESP901E is engineered for single serial port applications, providing an easy and effective way to connect a serial device to a network. It supports various serial communication protocols, including RS-232, RS-422, and RS-485, making it versatile for a range of devices. One of its standout features is the ability to support 10/100 Mbps Ethernet connectivity, ensuring a reliable and high-speed network connection. Additionally, the ESP901E supports various network protocols, including TCP/IP and UDP, allowing users to integrate the device easily into their existing network infrastructure.

Moving to the ESP902, this model provides dual serial port capabilities, making it ideal for applications requiring the connection of multiple devices. Like the ESP901E, it supports common serial interfaces and offers the same 10/100 Mbps Ethernet connectivity. This flexibility enables it to cater to more complex systems where multiple serial devices need to be integrated into a single network environment. Furthermore, the ESP902 is equipped with features such as automatic baud rate detection, making configuration straightforward and reducing installation time.

The ESP902E enhances the capabilities of the ESP902 with additional features such as enhanced security protocols. It includes support for SSL and SSH, ensuring secure data transmission across the network. This added security layer is crucial for applications that handle sensitive information or require secure communication channels. The ESP902E maintains the user-friendly nature of its predecessors while integrating more advanced features suitable for modern industrial applications.

All three models boast rugged designs suitable for harsh environments, making them perfect for industrial applications without compromising performance. With an extensive operating temperature range and robust housing, these devices can withstand the rigors of factory floors and outdoor installations.

Overall, the ESP901E, ESP902, and ESP902E from B&B Electronics collectively serve to bridge the gap between serial communications and Ethernet networks, supporting various industrial applications while ensuring seamless integration, versatility, and security. Whether for simple single-port connections or more complex multi-port setups, these devices are designed to meet diverse connectivity needs with efficiency and reliability.