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

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

Featur :

With USB : No
is_customized : Yes
Model Number : AC Digital Multifunction Meter
Compatible Brand/Model : None
Brand Name : diymore
Origin : Mainland China
Condition : New


AC communication module

Overview

This document 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 description

1.1 Voltage

1.1.1 Measuring range:80260V

1.1.2 Resolution: 0.1V

1.1.3 Measurement accuracy: 0.5%

1.2 Current

1.2.1 Measuring range: 010A(PZEM-004T-10A); 0100A(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: 02.3kW(PZEM-004T-10A); 023kW(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: 0.001.00

1.4.2 Resolution: 0.01

1.4.3 Measurement accuracy: 1%

1.5 Frequency

1.5.1 Measuring range: 45Hz65Hz

1.5.2 Resolution: 0.1Hz

1.5.3 Measurement accuracy: 0.5%

1.6 Active energy

1.6.1 Measuring range: 09999.99kWh

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 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


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)

0x01,Illegal function

0x02,Illegal address

0x03,Illegal data

0x04,Slave 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

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