PZEM-004T 30 Version TTL Modbus-RTU Meter Kwh Meter AC Single Phase 100A Electric Volt Amp Frequency Factor MeterWe provide the software to connect it with the PC. If you want to connect it with other terminal device such as PLC,SCM and so on, please prepare the fitable cable and write the program by yourself.This document describes the specification of the PZEM-004T AC communication module, the module is mainly used for measuring AC voltage, current, active , frequency, factor and active energy, the module is without display function, the data is read through the TTL interface.PZEM-004T-100A: Measuring Range 100A (external transformerVery Important Notification:For this product PZEM-004T, we have the update version to replace the old version. The update information as following:1. the new version has the same size and TTL port as before2. the software is new, we have English software as same as the PZEM-014,016, The communication protocol change to be Modbus-RTU, the display interface is changed. now it can test Voltage ,Current, , factor, Frequency and Energy 6 parameters.3. the new version has higher precision, faster refresh speed and the more stability communication than the old version.4. This is the module with the very nice outcase.Brand Name: DIY Supplies: ElectricalRated Voltage: 220VMax Operating Current: 100A - 119ADimensions: 78cm * 37cm Supply: ACModel Number: PZEM-004TOutput Voltage: 220VPhase: Single PhaseDisplay Type: Digital OnlyOperating Temperature: -10-60degreeMeasuring Energy Range: 100A/22000WAccuracy Class: 10Accessory: split CTCommunicate Port: TTLCurrent range: 0-100AVoltage range: 80-260V range: 0-22kw factor: 0-1Frequency: 45-65HzProtocol: ModbusColor: blue + blackmaterial: plasticPackage Contents:1 * PZEM-004T AC Voltmeter Ammeter with outcase1 * split 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.