Devantech multichannel relay module boards devantech eth002 the eth002 is an update of the eth rly02 board the eth002 can be more easily updated with new firmware and there is also a new command set option in addition to legacy commands that allows the relay to pulse for a specified duration 100ms to 255s with a 100ms resolution the eth002 is a relay module board that provides 2x volt free contact relay outputs each having a current rating of up to 16a each required power for the mod