SONOFF SPM-4CH 20A/circuit communicates with other SPM-4Relays via RS-485 Works with eWeLink app
SONOFF Stackable Power Meter SPM-Main SONOFF Stackable Power Meter realizes intelligent management with overload protection, metadata monitoring and electricity statistics, supports power-on status (the firmware of the main unit, 4 relays is updated to version 1.2.0, and eWeLink app is updated to 4.23.0). SPM-Main communicates with the cloud via Ethernet or WiFi and communicates with SPM-4Relays via RS-485, which enables long-distance stable multi-terminal data transmission.
