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Diamond Point International

B&B Vlinx ESR900Series - 1, 2 & 4 port Ethernet to Serial Converters

RS-422/485, RS-232/422/485 and RS-232 to Ethernet, Wide Temperature


ESR900 Series Industrial Ethernet Serial Server - One, Two or Four Ports

This Ethernet to RS-232 and RS-485 Converter was designed especially for Industrial applications. Features like a thin-profile DIN mount case, IP30 rating, wide temperature range and wide range, redundant power supply make the Vlinx® ESR series Industrial Ethernet Serial Servers the best fit for industrial users.


Use the ESR to convert Ethernet to RS232 or convert Ethernet to RS485 to connect PLC's, CNC machines, HMI panels or any other industrial equipment that has an RS232, RS422 or RS485 serial port to the LAN. By installing an ESR Ethernet Serial Server you'll be able to communicate with that equipment from anywhere on the LAN or WAN, eliminating trips out to the plant for programming, diagnostics or data gathering.

No software changes required, the ESR Ethernet to RS-232 and RS-485 Converter can be transparent to your existing software making installation quick and easy. Your office or control room PC will show the device as if it had a direct serial communications connection to monitor and fine tune it. You can even troubleshoot the distant device from outside your LAN via the Internet.

Vlinx™ Manager Software

Vlinx Manager software allows easy access to the serial server to configure the server and its ports, upgrade server firmware and monitor port status and activity. When the Vlinx Manager opens it will search for and display all serial servers on the network.

The Monitor Port feature allows you to use any PC on the LAN/WAN to actively view and troubleshoot the communications status. It shows when there is a client connection to the server and the client IP address. It displays the number of bytes transmitted and received as well as the status of the hardware handshaking lines.

Web Server

ESR Ethernet to RS-232 and RS-485 Converters can be accessed and configured from an Internet Explorer web browser on the LAN/WAN. This allows you to remotely manage the software and your serial device. It also allows off-site troubleshooting.

Heartbeat Connection Protection

When there is an interruption in communication the Serial Server will attempt to reconnect the TCP data connection every five seconds until communication is re-established. Without this feature a device that loses a connection and stops communicating would not be able to reconnect without a person attending to the problem. The Heartbeat feature works with virtual COM and paired mode.



InterfaceSerial Interfaces: RS-232 (DTE), RS-422, RS-485 (2/4-Wire)
Parity: None, Even, Odd, Mark, Space
Data Bits: 5, 6, 7, or 8
Stop Bits: 1, 1,5, or 2
Serial Buffer: 8 kb per port
Data Rates110 to 230.4 kbps
• Data Rate: 10/100 Mbps Auto-detecting 10BaseT or 1000BaseTx
• Protocols: TCP, IP, ARP, DHCP, Telnet, HTTP, UDP, ICMP
Connector(s)Serial Connectors:
• ESR901: TB and DB9 M (selectable)
• ESR902: 2 x DB9 M
• ESR904: 4 x DB9 M
Ethernet Connector: RJ-45 F
Power Connector: Removable Terminal Block


Electrical9 to 48 VDC or 8 to 24 VAC
Power Consumption:
• ESR901: 320 mA @ 12 VDC
• ESR902: 340 mA @ 12 VDC
• ESR904: 326mA @ 12 VDC
MechanicalESR901/902: 1.75 x 6.1 x 4.1 in (4.46 x 15.52 x 10.46 cm)
ESR904: 1.75 x 7.1 x 4.1 in (4.46 x 18.03 x 10.46 cm)
IP 30
• Console: RS-232 w/ VT100 Emulation
• Telnet: HyperTerminal w/VT100 Emulation
• ESP Manager: Compatible w/Win98, ME, 2000, 2003, XP, NT, and Vista
• HTTP: Embedded Web Page
TemperatureTemperature range (operation): -10 to +80°C
Humidity5 to 95% Non-condensing
WeightVESR90x: 149.7 g (0.33 lbs)
VESR92x: 204.1 g (0.45 lbs)
Safety/CertificationCE, FCC

Ordering Details

BoardESR901 1 Port Ethernet Serial Server, DIN, Wide Temperature
ESR902 2 Port Ethernet Serial Server, DIN, Wide Temperature
ESR904 4 Port Ethernet Serial Server, DIN, Wide Temperature
AccessoriesDR19RMKT Din Rail 19-Inch Rack Mount Kit
DR-75-24 75W DIN-Rail 24 VDC Power Supply
DR-30-12 12 VDC, 24A DIN Rail Power Supply
MDR-40-12 Ps, Din, Slim, Plastic, 40W, 12V

ES1BEIGE Screw-type End Bracket for MR35 rail, 20 Pcs
CC2.5/10 Cross Connector for ER2.5, ERD2.5, 2.5mm, 10 Pole, Screw, 5Pcs
ERS35 Din Rail 1 Meter 35Mm Steel
ER2.5BEIGE Screw Clamp Terminal, 5mm W, 600V, 20A, 12-26AWG, Beige, 100Pcs
MT5-1-50 Marker 5 x 5 mm, White, Printed 1-50, for all terminals, 500 Pcs
ERPE2.5/4 Ground Terminal, 10-26AWG, 50Pcs