The Pro Series controllers offer a economical board with a limited command set. Great for users who are interested in controlling the
relay through a DB-9 interface with limited commands to enable and disable the device.
The R120RS features include no-click startup, LED status lights, and E3C compliance. Relays can be controlled at 9600 baud and the board is
compatible with ANY computer or micro-controller capable of delivering RS-232 data.