Part#: 4104


Ethernet to 1-Port RS-232, RS-422, RS-485 Serial Server



The 4104 Ethernet to serial server is the easiest way to connect RS-232, RS-422, or RS-485 serial devices to your Ethernet network. SeaLINK® products use industry standard RFC 2217 TCP/IP protocol for maximizing compatibility with the widest range of applications and devices.

Sealevel’s SeaLINK software drivers and utilities make installation and operation easy using Microsoft Windows operating systems. After software installation, the 4104’s serial ports appear as virtual COM ports to the host machine. Standard serial operating calls are transparently redirected to the 4104, guaranteeing compatibility with legacy serial devices and enabling backward compatibility with existing software. Serial tunneling is also supported, allowing two native serial devices to communicate over a network. Alternatively, raw data socket mode is supported, eliminating the need for a driver.

To simplify installation and configuration, a printed copy of the SeaLINK QuickStart Guide is included with all Ethernet serial server orders.

Additional information

Weight 2.5000 lbs
Dimensions 5.0 x 4.2 x 1.1 in


Electrical Interface

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Host Interface(s)

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Storage Temperature

  • • Ethernet 10/100BaseT (autosense)
  • • Configurable for RS-232, RS-422, or RS-485
  • • Automatic RS-485 enable/disable
  • • Appears as a virtual COM port to host machine
  • • Data rates to 230.4K bps
  • • Supports custom baud rates and 9-bit protocol
  • • Built-in watchdog/reset circuit for fault tolerance • Single DB9M connector

  • • Includes 120V AC adapter that outputs 5VDC @ 1A (Item# TR107)
  • • Includes 7′ Ethernet patch cable (Item# CA246) and 7′ Ethernet crossover cable (Item# CA251)
  • • Sealevel SeaLINK software supports Microsoft Windows and Linux operating systems


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