1-Port RS-232 to RS-422/485 Adapter with 25KV ESD Protection and Metal Case

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The SER-COMi-M and SER-COMi-SI-M are used to convert RS-232 signals to RS-422/485 signals. The converters provide instant connectivity to RS-422/485 communication devices for factory automation equipment, multi-drop data collection devices, barcode readers, time clocks, scales, data entry terminals, PC to PC long distance communications (up to 1.3KM) and serial communication in harsh environments.

The SER-COMi-M and SER-COMi-SI-M provide an industrial solution for applications requiring single node or multi-drop communications over short and long distances. In RS-485 half-duplex mode, SER-COMi-M and SER-COMi-SI-M also provides automatic data transmit/receive control.

The SER-COMi-SI-M converter is optically isolated with 2000 Volt DC optical isolation. The optical isolation protects your PC from spikes and surges on the RS-422/485 network, by converting the electrical pulse into an optical signal and then changing it back into an electrical pulse. Your computer is well protected, since the surges and spikes cannot cross the optical link. The SER-COMi-SI-M is protected by surge protector to withstand electrostatic discharge and power surges up to 25kV ESD. Surge suppression on all signals prevent from damages caused by lightning or high voltage.


  • Converts RS-232 port to high speed RS-422/485 port
  • RS-232 port can be selected to DCE or DTE pin assignment
  • Data rates: 300bps to 1Mbps
  • RS-232 connector: one DB9 female connector
  • RS-422/485 connector: one DB9 male connector and one 5-pin terminal block
  • Auto transmit/receive control for 2-wire RS-485 half-duplex operation
  • Termination and biasing resistors installed on-board
  • RS-422 data signals: TxD-, TxD+, RxD+, RxD-, GND, RTS-, RTS+, CTS+, CTS-
  • RS-485 data signals: TxD-, TxD+, RxD+, RxD- (4 wire), Data-, Data+ (2 wire)
  • Monitor LEDs of TxD, RxD indicating port status
  • Wide input power range: 9VDC to 48VDC
  • Includes an external switching terminal power adapter
  • SER-COMi-SI-M is optically isolated with 2000VDC optical isolation
  • SER-COMi-SI-M is protected by surge protector on all signal lines to withstand electrostatic discharge and power surges up to 25kV ESD


Serial Interface
Number of Ports1
ConnectorInput: DB9 Output: DB9 and 5-pin terminal block
Max. Speed1Mbps for transmit & receive
RS-422 SignalsTxD-, TxD+, RxD+, RxD-, GND, RTS-, RTS+, CTS+, CTS-
RS-485 Signals (4 wire)TxD-, TxD+, RxD+, RxD-, GND
RS-485 Signals (2 wire)Data-, Data+, GND
Protection25kV ESD protection for all signals 2000V DC optical isolation for all signals
Power InputDC 12V, 1A external power adapter
CasingSECC metal chassis with DIN rail bracket
Operating Temperature0°C to 55°C (32°F to 131°F)
Storage Temperature-20°C to 75°C (-4°F to 167°F)
Operating Humidity5% to 95% RH
Safety ApprovalsCE, FCC


Product Manual