RS-232 Connections

APPENDIX A: RS-232 CONNECTIONS

ESP904 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 41. RS-232 Connections in a DB-9 Connector

Manual Documentation Number: ESP904-0504

Appendix

57

RS-232 Connections

RS-232 Straight-through Cable Connections

In the RS-232 mode, the ESP904’s ports are configured as DTEs like a computer. If the device connected to the ESP904 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 42. Straight-through (DTE to DCE) DB-9 to DB-9 Serial Cable

with RS-232 Signal Designations

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 43. Crossover (DTE to DTE) DB-9 to DB-9 Serial Cable with

RS-232 Signal Designations

58

Appendix A

Manual Documentation Number: ESP904-0504

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

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

B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445www.bb-europe.com

B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445www.bb-europe.com

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B&B Electronics ESP904E manual Appendix a RS-232 Connections, ESP904 DB-9 Pin-outs in RS-232 Mode, RS-232 DB-9M

ESP904E, ESP904 specifications

B&B Electronics has established itself as a leader in developing innovative communication and networking solutions, and the ESP904 and ESP904E models are perfect examples of this commitment to excellence. These devices are designed specifically for Serial to Ethernet/IP communication, making them suitable for a wide range of applications in industrial environments.

One of the main features of the ESP904 is its ability to convert serial data from RS-232, RS-422, or RS-485 interfaces into Ethernet data, facilitating communication with remote servers or other devices over an IP network. This serial-to-Ethernet conversion enables the integration of legacy serial devices into modern network infrastructures, ensuring that businesses can take advantage of new technologies while maximizing their existing investments.

The ESP904E model enhances the base ESP904 by adding even more advanced features, including increased processing power and enhanced security protocols. This robustness is crucial for applications where data integrity and security are paramount, such as in industrial automation, transportation, and telecommunications. The device supports a wide range of encryption methods for secure communications, protecting sensitive data from unauthorized access.

In terms of technologies, both models support full TCP/IP networking capabilities, allowing for seamless communication across various network environments. They are equipped with a built-in web server, enabling easy configuration and monitoring via a standard web browser. This eliminates the need for dedicated software and simplifies the deployment process.

Key characteristics of the ESP904 and ESP904E include robust construction designed for harsh industrial conditions, a compact design that allows for easy installation, and the ability to support multiple simultaneous connections. They also feature flexible power options, enabling connections through PoE (Power over Ethernet) or traditional power supplies, enhancing compatibility with different setups.

In addition, both models support various operating modes, including Server, Client, and Proxy modes, giving users flexibility in how they integrate their devices. The modular design of the ESP904 and ESP904E means that they can be easily updated and expanded as technology evolves.

Overall, the B&B Electronics ESP904 and ESP904E are powerful tools for organizations looking to modernize their communication architectures, providing reliability and performance that meet the demands of today’s networking environments. Whether for a small setup or a complex industrial network, these devices offer the versatility and capabilities needed to ensure success.