SCM and so on, please prepare the fitable cable and write the program by yourself.the specification of the PZEM-004T AC communication module, the module is mainly used for measuring AC voltage, current, active power, frequency, power factor and active energy, the module is without display function, the data is read through the TTL interface.PZEM-004T-10A: Measuring Range 10A (Built-in Shunt)PZEM-004T-100A: Measuring Range 100A (external transformer)DIY Supplies: ElectricalMeasuring Energy Range: 100A/22000WRated Voltage: 220VPower Supply: ACDisplay Type: Digital OnlyOutput Voltage: 220VDimensions: 7.8cm*3.7cmModel Number: PZEM-004TPhase: Single PhaseOperating Temperature: -10-60degreeAccuracy Class: 1.0Max Operating Current: 100A - 119AAccessory: Coil CTCommunicate Port: TTLCurrent range: 0-100AVoltage range: 80-260VPower range: 0-22kwPower factor: 0-1Frequency: 45-65HzProtocol: Modbuscolour:Blue + blackMaterial:plasticPackage Contents:1 * PZEM-004T AC Voltmeter Ammeter with outcase1 * Coil CTOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.