The I/O Sentinel® 4 G2 is a robust, full-featured Ethernet based data acquisition and remote-control device with four optically isolated status (logic) inputs and four programmable relays. The I/O Sentinel® 4 G2’s four optically isolated status/logic inputs may be configured for wet or dry (contact closure) status/logic monitoring. The four one-amp SPDT relay outputs may be configured for ON, OFF, pulsed or reboot operation.