The decoder‑controller can be operated via mobile phone. It comes with a built‑in 4G data‑SIM card and can also be controlled through a mini‑program on a computer.

1. WIFI Connection Compatibility

Two hardware versions are available:

1. Pure 4G built‑in SIM version: This model relies solely on 4G cellular network. It is not equipped with a WIFI module and cannot connect to home or on‑site WIFI. Remote communication is achieved through mobile operator data traffic.
2. 4G + WIFI dual‑communication version: Dual‑network support is provided. The device can switch to WIFI connection when a WIFI signal is available, and automatically falls back to 4G mobile data if the WIFI signal is lost. Operation via mobile phone or computer mini‑program remains functional under both network modes.

For outdoor open‑air rainwater harvesting projects, the pure‑4G version is the standard configuration in most cases to prevent disconnection caused by unstable WIFI signals.

2. Compatibility with AC & DC Solenoid Valves

1. AC Solenoid Valves (AC24V / AC220V) The relay output of a standard 4G decoder‑controller only sends switch‑on/off signals. It cannot directly drive AC solenoid valves. An additional intermediate relay or AC contactor is required for conversion to control 220V or 24V AC valves.
2. DC Solenoid Valves (DC12V / DC24V, pulse‑type / normally‑closed valves) 4G decoder‑controllers specially designed for rainwater harvesting and irrigation are natively compatible with DC pulse solenoid valves and DC latching valves. Direct wiring drive is supported, which is the mainstream matching solution in this industry.
3. Summary The controller generally cannot drive AC valves directly. DC solenoid valves can be matched directly, while AC valves require an extra relay conversion module.

Supplementary Information (Common Configuration for Kaifeng Railway Station Rainwater Project)

For automatic‑control equipment used in sponge‑city rainwater‑harvesting projects, the standard configuration is: 4G full‑netcom, remote control via mini‑program, support only for DC12V/24V solenoid valves, and no built‑in WIFI module for outdoor sites without WIFI coverage.

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