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Manufacturer of computer controlled relay, I/O and custom boards for commercial and industrial applications.

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8 Channel

Relay boards with 8 channels (8 relays on the board)

Designed for single board operation or multiple board operation on the same USB port - this is accomplished by adding our 8 channel RS232 boards in a daisy chain configuration.  Up to 15 RS232 boards can be connected to the first USB board in this daisy chain configuration - allowing up to a total of 128 relays under PC control on each USB port. Each additional RS232 requires one  modular cable to connect to the next board. 

Each board has a board address when used in multiple board applications (daisy chained).  DIP switches are used to uniquely identify each board - since all the boards are connected to the same USB channel, the host computer needs to communicate to each board - without talking to the other boards on the same channel. Every board must be set to a different address to operate correctly.