Black Box LES421A 1-Port Hardened Serial Server

Black Box Black Box

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Black Box LES421A 1-Port Hardened Serial Server.

For easy remote monitoring and control of an RS-232, -422, or -485 device over a LAN or WAN.


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  • Enables you to monitor a serial industrial device from your office.
  • Configure a device, troubleshoot, upgrade firmware, and more.
  • Rugged design for operation in a wide temperature range.
  • UL® Listed for use in Class 1 Division 2 hazardous areas.
  • NEMA TS-2 rated for use in transportation applications.
  • Offers direct IP, virtual COM port, or paired modes of operation.
  • Features a DB9 port and terminal block for serial connections.
  • Equipped with a 10-/100-Mbps port for LAN/WAN connectivity.
  • Built-in Web server for browser-based management.
  • Includes easy-to-use configuration software.
  • Boasts high throughput with low latency.
  • Slim IP30 enclosure saves on DIN rail space.
  • Easily integrates a serial device into your Ethernet network.
  • UL certified for use in Class 1, Div.2 hazardous environments.
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 Controls (1) mode switch for resetting unit, entering console mode, resetting to factory defaults
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 or (1) removable terminal block;
Ethernet: (1) RJ-45 (10BASE-T/100BASE-TX);
Power: (1) removable terminal block
Operating Temperature -40 to +176° F (-40 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:

LES421A

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Black Box LES421A 1-Port Hardened Serial Server

Black Box LES421A 1-Port Hardened Serial Server

Black Box LES421A 1-Port Hardened Serial Server.

For easy remote monitoring and control of an RS-232, -422, or -485 device over a LAN or WAN.