Relay boards with 8 channels (8 relays on the board)
Designed for single board operation or multiple board operation on the same serial port. Up to 16 boards can be connected in a daisy chain configuration, with up to a total of 128 relays under PC control.
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 serial RS-232 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.