Multifunction AC Digital Meter 0-100A 80-260V Watt Power Volt Amp Current Test Module PZEM-004T For Arduino TTL COM2\\COM3\\COM4

Multifunction AC Digital Meter 0-100A 80-260V Watt Power Volt Amp Current Test Module PZEM-004T For Arduino TTL COM2\COM3\COM4

AC communication module Overview This doent describes 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) 1.Function descrtion 1.1 Voltage 1.1.1 Measuring range:80～260V 1.1.2 Resolution: 0.1V 1.1.3 Measurement accuracy: 0.5% 1.2 Current 1.2.1 Measuring range: 0～10A(PZEM-004T-10A); 0～100A(PZEM-004T-100A) 1.2.2 Starting measure current: 0.01A(PZEM-004T-10A); 0.02A(PZEM-004T-100A) 1.2.3 Resolution: 0.001A 1.2.4 Measurement accuracy: 0.5% 1.3 Active power 1.3.1 Measuring range: 0～2.3kW(PZEM-004T-10A); 0～23kW(PZEM-004T-100A) 1.3.2 Starting measure power: 0.4W 1.3.3 Resolution: 0.1W 1.3.4 Display format: ＜1000W, it display one decimal, such as: 999.9W ≥1000W, it display only integer, such as: 1000W 1.3.5 Measurement accuracy: 0.5% 1.4 Power factor 1.4.1 Measuring range: 0.00～1.00 1.4.2 Resolution: 0.01 1.4.3 Measurement accuracy: 1% 1.5 Frequency 1.5.1 Measuring range: 45Hz～65Hz 1.5.2 Resolution: 0.1Hz 1.5.3 Measurement accuracy: 0.5% 1.6 Active energy 1.6.1 Measuring range: 0～9999.99kWh 1.6.2 Resolution: 1Wh 1.6.3 Measurement accuracy: 0.5% 1.6.4 Display format: ＜10kWh, the display unit is Wh(1kWh=1000Wh), such as: 9999Wh ≥10kWh, the display unit is kWh, such as: 9999.99kWh 1.6.5 Reset energy: use to reset. 1.7 Over power alarm Active power threshold can be set, when the measured active power exceeds the threshold, it can alarm 1.8 Communication interface RS485 interface。 2 Communication protocol 2.1 Physical layer protocol Physical layer use UART to RS485 communication interface Baud rate is 9600, 8 data bits, 1 stop bit, no parity 2.2 Application layer protocol The application layer use the Modbus-RTU protocol to communicate. At present, it only supports function codes such as 0x03 (Read Holding Register), 0x04 (Read Input Register), 0x06 (Write Single Register), 0x41 (Calibration), 0x42 (Reset energy).etc. 0x41 function code is only for internal use (addre can be only 0xF8), used for factory calibration and return to factory maintenance occasions, after the function code to increase 16-bit paword, the default paword is 0x3721 The addre range of the is 0x01 ~ 0xF7. The addre 0x00 is used as the broadcast addre, the does not need to reply the master. The addre 0xF8 is used as the general addre, this addre can be only used in single- environment and can be used for calibration etc.operation. 2.3 Read the measurement result The command format of the master reads the measurement result is(total of 8 bytes): Addre + 0x04 + Register Addre High Byte + Register Addre Low Byte + Number of Registers High Byte + Number of Registers Low Byte + CRC Check High Byte + CRC Check Low Byte. The command format of the reply from the is divided into two kinds: Correct Reply: Addre + 0x04 + Number of Bytes + Register 1 Data High Byte + Register 1 Data Low Byte + ... + CRC Check High Byte + CRC Check Low Byte Error Reply: addre + 0x84 + Abnormal code + CRC check high byte + CRC check low byte Abnormal code yzed as following (the same below) 0x01,Illegal function 0x02,Illegal addre 0x03,Illegal data 0x04, error The register of the measurement results is arranged as the following table For example, the master sends the following command (CRC check code is replaced by 0xHH and 0xLL, the same below) 0x01 + 0x04 + 0x00 + 0x00 + 0x00 + 0x0A + 0xHH + 0xLL Indicates that the master needs to read 10 registers with addre 0x01 and the start addre of the register is 0x0000 The correct reply from the is as following: 0x01 + 0x04 + 0x14 + 0x08 + 0x98 + 0x03 + 0xE8+0x00 + 0x00 +0x08 + 0x98+ 0x00 + 0x00 + 0x00 + 0x00 + 0x00 + 0x00 + 0x01 + 0xF4 + 0x00 + 0x64 + 0x00 + 0x00 + 0xHH + 0xLL The above data shows Voltage is 0x0898, converted to decimal is 2200, display 220.0V Current is 0x000003E8, converted to decimal is 1000, display 1.000A Power is 0x00000898, converted to decimal is 2200, display 220.0W Energy is 0x00000000, converted to decimal is 0, display 0Wh Frequency is 0x01F4, converted to decimal is 500, display 50.0Hz Power factor is 0x0064, converted to decimal is 100, display 1.00 Alarm status is 0x0000, indicates that the current power is lower than the alarm power threshold 2.4 Read and modify the At present,it only supports reading and modifying addre and power alarm threshold The register is arranged as the following table The command format of the master to read the and read the measurement results are same(descrybed in details in Section 2.3), only need to change the function code from 0x04 to 0x03. The command format of the master to modify the is (total of 8 bytes): Addre + 0x06 + Register Addre High Byte + Register Addre Low Byte + Register Value High Byte + Register Value Low Byte + CRC Check High Byte + CRC Check Low Byte. The command format of the reply from the is divided into two kinds: Correct Response: Addre + 0x06 + Number of Bytes + Register Addre Low Byte + Register Value High Byte + Register Value Low Byte + CRC Check High Byte + CRC Check Low Byte. Error Reply: addre + 0x86 + Abnormal code + CRC check high byte + CRC check low byte. For example, the master sets the 's power alarm threshold: 0x01 + 0x06 + 0x00 + 0x01 + 0x08 + 0xFC + 0xHH + 0xLL Indicates that the master needs to set the 0x0001 register (power alarm threshold) to 0x08FC (2300W). Set up correctly, the return to the data which is sent from the master. For example, the master sets the addre of the 0x01 + 0x06 + 0x00 + 0x02 + 0x00 + 0x05 + 0xHH + 0xLL Indicates that the master needs to set the 0x0002 register (Modbus-RTU addre) to 0x0005 Set up correctly, the return to the data which is sent from the master. 2.5 Reset energy The command format of the master to reset the 's energy is (total 4 bytes): addre + 0x42 + CRC check high byte + CRC check low byte. Correct reply: addre + 0x42 + CRC check high byte + CRC check low byte. Error Reply: addre + 0xC2 + Abnormal code + CRC check high byte + CRC check low byte 2.6 Calibration The command format of the master to calibrate the is (total 6 bytes): 0xF8 + 0x41 + 0x37 + 0x21 + CRC check high byte + CRC check low byte. Correct reply: 0xF8 + 0x41 + 0x37 + 0x21 + CRC check high byte + CRC check low byte. Error Reply: 0xF8 + 0xC1 + Abnormal code + CRC check high byte + CRC check low byte. It should be noted that the calibration takes 3 to 4 seconds, after the master sends the command, if the calibration is succeful, it will take 3 ~ 4 seconds to receive the response from the . 2.7 CRC check CRC check use 16bits format, occupy two bytes, the polynomial is X16 + X15 + X2 +1, the polynomial value used for calculation is 0xA001. The value of the CRC check is a frame data divide all results of checking all the bytes except the CRC check value. 3 Functional block diagram 5 Other instructions 5.1The TTL interface of this module is a paive interface, it requires external 5V power supply, w hich means, when communicating, all four ports must be connected (5V, RX, TX, GND), otherwis e it cannot communicate. 5.2 Working temperature -20’C ~ +60’C。

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