Serial Device Servers
4803 Ethernet Serial Device Server
4803 - 8 Port RS-232/422/485 Ethernet Serial Device Server (SeaLINK+8.ULTRA)
CE is a mandatory standard for products on the market in the European Economic Area. By CE marking a product, the manufacturer ensures that the item meets the essential safety requirements set out in the applicable CE directive.
This product fully adheres to the Restriction of Hazardous Substances Directive 2002/95/EC, RoHS for short.  The directive covers the restriction of use of certain hazardous substances in electrical and electronic equipment and was adopted in February 2003 by the European Union.
This product has a lifetime warranty against product failure (excludes user or enviromental damage).
The Federal Communications Commission (FCC) is an independent agency of the United States government that sets standards and governs the testing of conducted and radiated emissions such as EMI.

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8 Port RS-232/422/485 Ethernet Serial Device Server with TR103/CA189 UK PSU
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Peripheral information
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1 off price**
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CAT5 Patch Cable, 7' in Length - Blue
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DB9 Female (RS-422) to DB25 Male (RS-530) Cable, 10" in Length
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Terminal Block - DB9 Female to 9 Screw Terminals
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Terminal Block Kit - TB06 + (2) CA127 Cables
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DIN Rail Mounting Clips - for 440x, 480x, 280x
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All prices exclude VAT at current rate.
Minimum order value - £50 (exc. VAT and delivery).
Free delivery of the 4803 to UK Mainland on orders over £150 (exc. VAT and delivery) when purchasing online - excludes Northern Ireland, Isle of Man, Isle of Wight, Scottish Islands and the Channel Islands.

* Lead time is indicative and is subject to change at time of ordering. Next business day delivery on in-stock products only (when ordered before 3pm).
** Contact us for quantity or project pricing.
† Additional delivery charge may be incurred for certain postcodes (calculated at checkout)

4803 overview

  • Manufacturer : Sealevel
  • Interface : Ethernet to RS-232/422/485 Server
  • LAN : Ethernet 10/100BaseT (autosense)
  • Ports : 4
  • Max. Data Rate : 230.4K bps
  • Max. Data Distance : up to 4000ft
  • Other Features : Appears as virtual COM ports to host machine
  • All modem control signals implemented
  • Automatic RS-485 enable/disable
  • Built-in watchdog/reset circuit for fault tolerance
  • Connectors : 4 x DB9M
  • Power Requirements : +5V @ 1A with 5V DC mains adapter included
  • Operating Temperature : 0 to +70C
  • Software : SeaCOM software drivers included
  • Warranty : Lifetime Warranty
The 4803 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.

The included software works under a wide variety of operating systems including Windows 98/ME/NT/2000/XP, and the 4803's serial ports appear as virtual COM ports to the host machine.

Standard serial operating calls are transparently redirected to the 4803, 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. Each port can be individually configured as RS-232, RS-422, or RS-485.
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