FSR IT-R4S ASCII Controlled Relay Module

The IT-R4S is how a control system that only speaks serial ends up driving a projection screen, a set of shades or a contactor. Four SPDT relays respond to a plain ASCII command set, which means it can be driven from almost anything with an RS-232 port and no custom module.

The serial loop output is the part that scales. Commands pass through to the next device on the chain, so several relay modules and the equipment beyond them share one serial run. One compatible supply powers up to five IT-R4 or IT-R4S modules.