PZEM004T New Version AC 80-260V 100A TTL Port Modbus-RTU Voltmeter Electric Power Monitor Volt Amp Power Energy with Split CT
We provide the software to connect it with the PC. If you want to connect it with other terminal device such as PLCSCM 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 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)
If you need the software please download it via this link:
For this product PZEM-004T we have the update version to replace the old version. The old version has beensoldout and no produce anymore. The update information as following:
1. the new version has the same size and TTL port as before
2. the software is new we have English software as same as the PZEM-014016 The communication protocol change to be Modbus–RTU the display interface is changed. now it can test Voltage Current Power Power 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. The new version increase a set for 0-10A
5. Now the product is still naked PCB but in the future we will have the good outside case.
Now you can still use the old link to submit the order if there is any question welcome to contact the service to get more information.
＜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.
1.7Over power alarm
Active power threshold can be set when the measured active power exceeds the threshold it can alarm
1.8Communication interface
RS485 interface
1 Communication protocol
1.1Physical layer protocol
Physical layer use UART to TTLcommunication interface
Baud rate is 9600 8 data bits 1 stop bit no parity
1.2Application 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.
1.3Read 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
l Voltage is 0x0898 converted to decimal is 2200 display 220.0V
l Current is 0x000003E8 converted to decimal is 1000 display 1.000A
l Power is 0x00000898 converted to decimal is 2200 display 220.0W
l Energy is 0x00000000 converted to decimal is 0 display 0Wh
l Frequency is 0x01F4 converted to decimal is 500 display 50.0Hz
l Power factor is 0x0064 converted to decimal is 100 display 1.00
l Alarm status is 0x0000 indicates that the current power is lower than the alarm power threshold
1.4Read and modify the slave parameters
At presentit only supports reading and modifying slave address and power alarm threshold
The register is arranged as the following table
Register address
Description
Resolution
0x0001
Power alarm threshold
1LSB correspond to 1W
0x0002
Modbus-RTU address
The range is 0x0001-0x00F7
The command format of the master to read the slave parameters 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 slave parameters is (total of 8 bytes):
Slave Address - 0x06 - Register Address High Byte - Register Address 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 slave is divided into two kinds:
Correct Response: Slave Address - 0x06 - Number of Bytes - Register Address Low Byte - Register Value High Byte - Register Value Low Byte - 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.
1.7CRC 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.
100- new brandhigh quality
1x PZEM-004TACVoltmeter Ammeter not include the enclosure
1x SplitCT
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