The SOM96 Serial Output Module is designed to be used with IBM PCs and compatibles. Each module has 4 independent single pole changeover relays which can be independently addressed from the PC. The standard RS232 serial output is converted to RS485 by the first module and this is used to drive subsequent modules. Each module may be allocated one of 256 addresses, thus allowing for control of 1024 relays. Addresses are selected using an 8 way DIL switch and more than one module can have the same address.

This will allow several relays to be controlled simultaneously. Modules can be physically placed in positions remote from the PC. The link from the PC Serial Port to the first module is restricted to approximately 50 metres. After that modules can be located as much as 200 metres apart. Connection between the PC and the first module would normally use a standard null terminated modem lead connected to the 9 pin 'D' connector.

From the first module to subsequent units twin screened cable is recommended with connections to the screw terminal block provided. Inter-module wiring may be either parallel or serial with 'T' junctions as required.


  • Remote Operation
  • Easy Installation
  • 4 Independently Controlled Relays on each Module
  • Switches 2 Amps dc/50 Volt ac (1 Amp inductive)
  • Up to 256 Modules on a Single Serial Port
  • Voltage Free Changeover Relay Contacts
  • Up to 1024 Relays Controlled from a Single Serial Port
  • For Use with IBM PC and Compatibles
  • Versatile Inter-unit Wiring
  • Compact Size
  • PC to Module Connection via a Standard Lead
  • Communications from the Host is 9600 baud ASCII.


  • Process Control
  • Environmental Control
  • CCTV Controllers
  • Home Automation
  • Remote Control of Lamps, Motors, etc

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