* This is a Tibbo BASIC/C-programmable device and its function depends on the loaded app.
We offer many ready-to-use apps, among them a serial-over-IP (SoI) app, Modbus Gateway app, and Sensor Hub app.

DS203 RS232 Serial Device Server

In full production, but has been superseded by a newer DS1100 device.

Explore programmable serial controllers...

The DS203 is a serial device server that can be used to quickly network-enable virtually any serial device or system.

The DS203 is compatible with Tibbo Device Server Toolkit (TDST) for Windows. TDST includes the Virtual Serial Port Driver (VSPD), which enables you to use the serial port of the DS203 as a remote COM port of your PC. The Linux version of the VSPD is available as well.

Key Features

10/100 Base-T Ethernet port
One RS232 port



  • 10/100Base-T, auto-MDIX Ethernet port.
  • One RS232 port:
    • TX, RX, RTS, CTS, DTR, and DSR lines.
    • Baudrates of up to 115,200bps;
    • None/even/odd/mark/space parity modes;
    • 7 or 8 bits/character;
    • RTS/CTS flow control.
  • Four LEDs:
    • Green and red status LEDs on top of the device;
    • Link and speed Ethernet status LEDs on the RJ45 jack.
  • Power: 12VDC (10 ~ 24V).
  • Dimensions (LxWxH): 60 x 47 x 30mm.
  • Operating temperature range: -5 ~ +70°C.
  • Firmware is upgradeable through the serial port or network.
  • CE- and FCC-certified.

Optional Accessories:

  • DIN rail mounting kit
  • TB1100 terminal block adaptor (version "A" recommended)
  • 12V/0.5A adaptor: APR-P0011(US), APR-P0012(EU), APR-P0013(UK)
  • WAS-1498 crossover Ethernet cable
  • WAS-1499 straight Ethernet cable
  • WAS-P0004(B) DB9M-to-DB9F serial cable (device-to-PC)
  • WAS-P0005(B) DB9F-to-DB9F serial cable (device-to-device)

See Also:

Files and Documentation

SoI FirmwareEM_381D.BIN
DocumentationSerial-over-IP Solutions Manual
DS203 Hardware Manual
CE Certificateds203-ce.pdf
FCC Certificateds203-fcc.pdf

Order the DS203

TB1100 Terminal Block Adapter

TB1100 Terminal Block Adapter

DB9-to-terminal block adapter. Simplifies the installation and wiring of serial devices.