Black Box LES431A 1-Port Modbus Hardened Serial Server

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Black Box LES431A 1-Port Modbus Hardened Serial Server.

Easily link a serial Modbus device to a TCP Modbus device in harsh environments.


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  • UL® Listed for use in Class 1 Division 2 hazardous areas.
  • NEMA TS-2 rated for use in transportation applications.
  • Routes Modbus traffic based on Modbus ID, and remaps conflicting Modbus IDs.
  • Offers Modbus messaging priority control, selectable by source or function code.
  • Features a built-in Web server and easy-to-use management software.
  • Can be easily integrated into most Modbus network configurations.
  • Converts ASCII to RTU as well as ASCII or RTU to Modbus TCP.
  • Features a DB9 port and terminal block for serial connections.
  • Equipped with a 10-/100-Mbps port for TCP connectivity.
  • Boasts high throughput with low latency.
  • Slim IP30 enclosure saves you on DIN rail space.
  • Includes a DIN mounting clip and spring.
  • Provides a gateway between Modbus® TCP and Modbus ASCII or RTU devices.
  • Allows older PLCs and similar devices to talk to newer TCP sensors and meters.
  • Enables you to monitor a serial industrial device from your office.
  • Rugged design for operation in a wide temperature range.
Approvals CE, UL® Class 1 Division 2, NEMA TS-2 rated
Data Rate 230.4 Kbps, maximum
Indicators (3) LEDs: (1) Ready, (1) Serial Port, (1) Ethernet Link
User Control (1) switch for resetting unit
Web Management OS Compatability Windows® 2000, Windows XP (32-/64-bit), Windows 2003 Server (32-/64-bit), Windows Vista (32-/64-bit), Windows 2008 Server (32-/64-bit), Windows 7 (32-/64-bit)
Connectors Serial: (1) DB9 M (RS-232) or (1) removable terminal block (RS-422/485);
Ethernet: (1) RJ-45 (10BASE-T/100BASE-TX);
Power: (1) removable terminal block
Operating Temperature -29 to +176° F (-34 to 80° C)
Power From a separately available power supply:
10-48 VDC (58 VDC max.) on a removable terminal block;
Consumption: 4 W (maximum)
Dimensions 1.2"H x 3.2"W x 4.7"D (3 x 8.1 x 11.9 cm)
Weight 0.3 lb. (0.1 kg)

Part Code:

LES431A

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Black Box LES431A 1-Port Modbus Hardened Serial Server

Black Box LES431A 1-Port Modbus Hardened Serial Server

Black Box LES431A 1-Port Modbus Hardened Serial Server.

Easily link a serial Modbus device to a TCP Modbus device in harsh environments.