RS-485 Connections

APPENDIX C: RS-485 CONNECTIONS

ESP904 DB-9 Pin-out in RS-485 Mode

 

 

 

 

RS-485

Direction

RS-485

DB9M

Signal Name

 

 

Pin

Data B (+)

In/Out

DATA B (+)

3

Data A (−)

In/Out

DATA A (−)

4

Signal Ground

---

GND

5

Figure 51. DB-9 Pin-out in RS-485 Mode

Note:

Some RS-485 devices are marked opposite the RS-485 standard, which defines the Data B line as positive relative to Data A during a Mark state before enabling the transmitter, and after transmitting before tri-stating. If an RS-485 device does not respond, try swapping the Data B and Data A lines.

Figure 52. 2-wire RS-485 Connection

Manual Documentation Number: ESP904-0504

Appendix C

65

RS-485 Connections

To connect 4-Wire RS-485 devices, the RS-422 Mode can be used provided the ESP904 will be connected as a master in a single master system. If using multiple masters, the ESP904 cannot be used, as it does not tri-state the transmitter in RS-422 mode.

66

Appendix C

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 C RS-485 Connections, ESP904 DB-9 Pin-out in RS-485 Mode, RS-485 Direction

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.