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RS51-SPR-RELAY RS-232 Serial Relay - $59

picture of RS51-SPR


The RS51-SPR-RELAY was designed to create a simple and inexpensive RS-232 controlled addressable relay board.

By receiving a short sequence of normal alphanumeric characters, the RS51-SPR-RELAY can control either a single relay, or the individual relays on up to 16 addressable RS51-SPR boards.

A female DB9 connector on the RS51-SPR board matches the pinout of the serial port of an IBM PC equivalent computer and can be connected to it with a common DB9 pin-to-pin male-to-female cable.

An additional male DB9 connector matches the pinout on the computer and provides a method of "chaining" multiple boards with the same cable.

Up to 16 boards can be chained through these connectors and can be optionally powered from the power supply connected to the first board in the chain.

The RS51-SPR-RELAY is shipped with all the items needed to quickly and immediately connect it to a PC compatible computer and begin operation:

  • Wallblock power supply
  • RS-232 cable
  • Easy to use Reference Manual




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