PZEM-004T Single Phase Meter AC Ammeter Volt Power Kwh TTL RS485 w/ CT Coil

Description

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AC communication module
Overview
This document describes the specification of the
PZEM-0
04T
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-0
04T-10
0
A
: Measuring Range 100A (external transformer)
1.
Function description
Voltage
Measuring range:80～260V
Resolution: 0.1V
Measurement accuracy: 0.5%
Current
Measuring range:0～10A(
PZEM-0
04T-10A
); 0～100A(
PZEM-0
04T-1
0
0A
)
Starting measure current: 0.01A(
PZEM-0
04T-10A
); 0.02A(
PZEM-0
04T-1
0
0A
)
Resolution: 0.001A
Measurement accuracy: 0.5%
Active power
Measuring range:0～3kW(
PZEM-0
04T-10A
); 0～23kW(
PZEM-0
04T-1
0
0A
)
Starting measure power: 0.4W
Resolution: 0.1W
Display format:
＜1000W, it display one decimal, such as: 999.9W
≥1000W, it display only integer, such as: 1000W
Measurement accuracy: 0.5%
Power factor
Measuring range:0.00～00
Resolution: 01
Measurement accuracy: 1%
F
requency
Measuring range:45Hz～65Hz
Resolution: 0.1Hz
Measurement accuracy: 0.5%
Active energy
Measuring range: 0～99kWh
Resolution: 1Wh
Measurement accuracy: 0.5%
Display format:
＜10kWh, the display unit is Wh(1kWh=1000Wh), such as: 9999Wh
≥10kWh, the display unit is kWh, such as: 9999.99kWh
Reset energy: use software to reset.
Over p
ower alarm
Active power threshold can be set, when the measured active power exceeds the threshold, it can alarm
C
ommunication interface
RS485 interface。
2 Communication protocol
Physical layer protocol
Physical layer use UART to RS485 communication interface
Baud rate is 9600, 8 data bits, 1 stop bit, no parity
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.
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
Register address
Description
Resolution
0x0000
Voltage value
1LSB correspond to 0.1V
0x0001
Current value
low
16 bits
1LSB correspond to 0.001A
0x0002
Current value
high
16 bits
0x0003
Power value
low
16 bits
1LSB correspond to 0.1W
0x0004
Power value
high
16 bits
0x0005
Energy value
low
16 bits
1LSB correspond to 1Wh
0x0006
Energy value
high
16 bits
0x0007
Frequency value
1LSB correspond to 0.1Hz
0x0008
Power factor value
1LSB correspond to 0.01
0x0009
Alarm status
0xFFFF is alarm，0x0000is not alarm
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 slave address 0x01 and the start address of the register is 0x0000
The correct reply from the slave 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
Voltageis 0x0898, converted to decimal is 2200, display0V
Current is0x000003E8, converted to decimal is 1000, display 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
Read and modify the slave parameters
At present,it 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 0x
03
.
The command format of the master to modify the slave parameters is (total of 8 bytes):
Slave Address + 0x
06
+ 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 + 0x
06
+ Number of Bytes + Register Address Low Byte + Register Value High Byte + Register Value Low Byte + CRC Check High Byte + CRC Check Low Byte.
Error Reply: Slave address + 0x86 + Abnormal code + CRC check high byte + CRC check low byte.
For example, the master sets the slave's power alarm threshold:
0x01 + 0x
0
6
+ 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 slave return to the data which is sent from the master.
For example, the master sets the address of the slave
0x01 + 0x
0
6
+ 0x00 + 0x02 + 0x00 + 0x05 + 0xHH + 0xLL
Indicates that the master needs to set the 0x0002 register (Modbus-RTU address) to 0x0005
Set up correctly, the slave return to the data which is sent from the master.
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
C
alibration
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.
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.
3 Functional block diagram
Picture 3.1
PZEM-0
04T-10A
Functional block diagram
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Returns & Refund Policy
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wait 30 days
(US only n
eed 7-10 days)
,
Please take care it.Less than 30 days,we can't take a refund
.
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If is item is defective in 12 months, you can return it to us. We will send you a new replacement after receiving the defective item.
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