Features:

Not Include the RS485 TO USB Module

This document describes the specification of the PZEM-016 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 RS485 interface

PZEM-016: Measuring Range 100A (external transformer)

1. Function description 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 ~ 100A(PZEM-016) 1.2.2 Starting measure current: 0.02A(PZEM-016) 1.2.3 Resolution: 0.001A 1.2.4 Measurement accuracy: 0.5% 1.3 Active power 1.3.1 Measuring range: 0 ~ 23kW(PZEM-016) 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 software 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 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 (address can be only 0xF8), used for factory calibration and return to factory maintenance occasions, after the function code to increase 16-bit password, the default password is 0x3721 The address range of the slave is 0x01 ~ 0xF7. The address 0x00 is used as the broadcast address, the slave does not need to reply the master. The address 0xF8 is used as the general address, this address can be only used in single-slave 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): Slave Address + 0x04 + Register Address High Byte + Register Address 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 slave is divided into two kinds: Correct Reply: Slave Address + 0x04 + Number of Bytes + Register 1 Data High Byte + Register 1 Data Low Byte + ... + CRC Check High Byte + CRC Check Low Byte Error Reply: Slave address + 0x84 + Abnormal code + CRC check high byte + CRC check low byte Abnormal code analyzed as following (the same below) 2.5 Reset energy The command format of the master to reset the slave's energy is (total 4 bytes): Slave address + 0x42 + CRC check high byte + CRC check low byte. Correct reply: slave address + 0x42 + CRC check high byte + CRC check low byte. Error Reply: Slave address + 0xC2 + Abnormal code + CRC check high byte + CRC check low byte 2.6 Calibration The command format of the master to calibrate the slave 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 successful, it will take 3 ~ 4 seconds to receive the response from the slave. 2.7 CRC check CRC check use 16bits format, occupy two bytes, the generator 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.

5.1 Power supply AC voltage provides two isolated outputs after through the switching power supply, one way is 3.3V provides to the measurement system, the other way is 5V provides to 485 communication circuits and external circuits. 485 communication interface power is(+5 V),current output capability is 100mA 5.2 Working temperature -20’C ~ +60’C

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Package includes:

1 * PZEM-016 AC Communication module 1 * Coil CT