velleman VM204 Ethernet Relay Card User Manual
Learn about the Velleman VM204 Ethernet Relay Card with 4 relay contacts, 4 digital inputs, and 1 analog input. Control or check them from anywhere using a PC, smartphone, or tablet. This user manual provides instructions on connecting and using the card, firmware upgrades, and app downloads for iOS and Android devices. Be cautious when changing credentials to avoid deactivating relays.