AC Digital Multifunction Meter Watt Power Volt Amp TTL Current Test Module PZEM-004T With

AC communication module

Overview

This doent 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 iswithout display function, the data is read through the TTL interface.

PZEM-0 04T-10 0 A : Measuring Range 100A (external )

1.Function descrtion

1.1 Voltage

1.1.1 M easuring range :80～260V

1.1.2 R esolution : 0.1V

1.1.3 M easurement accuracy : 0.5%

1.2 Current

1.2.1 M easuring range : 0～10A( PZEM-0 04T-10A ); 0～100A( PZEM-0 04T-1 0 0A )

1.2.2 Starting measur e current: 0.01A( PZEM-0 04T-10A ); 0.02A( PZEM-0 04T-1 0 0A )

1.2.3 R esolution : 0.001A

1.2.4 M easurement accuracy : 0.5%

1.3 Active power

1.3.1 M easuring range :0～2.3kW( PZEM-0 04T-10A ); 0～23kW( PZEM-0 04T-1 0 0A )

1.3.2 Starting measur e power: 0.4W

1.3.3 R esolution : 0.1W

1.3.4 D isplay format :

＜1000W, it display one decimal, such as: 999.9W

≥1000W, it display only integer, such as: 1000W

1.3.5 M easurement accuracy : 0.5%

1.4 Power factor

1.1.1 M easuring range :0 .00 ～ 1.00

1.1.2 R esolution : 0.01

1.1.3 M easurement accuracy : 1%

1.1 F requency

1.1.1 M easuring range :45Hz～65Hz

1.1.2 R esolution : 0.1Hz

1.1.3 M easurement accuracy : 0.5%

1.2 Active energy

1.2.1 M easuring range : 0～9999.99kWh

1.2.2 R esolution : 1Wh

1.2.3 M easurement accuracy : 0.5%

1.2.4 D isplay format :

＜10kWh, the display unit is Wh(1kWh=1000Wh), such as: 9999Wh

≥10kWh, the display unit is kWh, such as: 9999.99kWh

1.2.5 Reset energy: use software to reset.

1.3 Over p ower alarm

Active power threshold can be set, when the measured active power exceeds the threshold, it can alarm

1.4 C ommunication interface

TTL interface。

2 Communication protocol

2.1 Physical layer protocol

Physical layer us e UART to TTL 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 , t he does not need to reply the master. The addre 0xF8 is used as the general addre , t h is addre can be only used in single- environment and can be used for calibration etc.operation.

1.1 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 Byte s + 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 analyzedas follow ing (the same below)

l 0x01, Illegal function

l 0x02, Illegal addre

l 0x03, Illegal data

l 0x04, error

The register of the measurement results is arranged as the following table

Register addre

Descrtion

Resolution

0x0000

Voltage value

1LSBcorrespondto 0.1V

0x0001

Current value low 16 bits

1LSBcorrespondto 0.001A

0x0002

Current value high 16 bits

0x0003

Power value low 16 bits

1LSBcorrespondto 0.1W

0x0004

Power value high 16 bits

0x0005

Energy value low 16 bits

1LSBcorrespondto 1Wh

0x0006

Energy value high 16 bits

0x0007

Frequency value

1LSBcorrespondto 0.1Hz

0x0008

Power factor value

1LSBcorrespondto 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 addre 0x01 and the start addre of the register is 0x0000

The correct reply from the is as follow ing:

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

l Voltage is 0x0898, converted to decimal is 2200, display 220.0V

l Current is0x000003E8 , converted to decimal is1000 , display1.000A

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, i ndicates that the current power is lower than the alarm power threshold

1.1 Read and modify the parameters

At present,it only supports reading and modifying addre and power alarm threshold

The register is arrange das the following table

Register addre

Descrtion

Resolution

0x0001

Power alarm threshold

1LSBcorrespondto 1W

0x0002

Modbus-RTU addre

The range is 0x0001 ~ 0x00F7

The command format of the master to read the parameters and read the measurement results are same (descrybed in detail s 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 parameters is (total of 8 bytes) :

Addre + 0x 06 + 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 + 0x 06 + 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 + 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 return to the data which is sent from the master.

For example, the master sets the addre of the

0x01 + 0x 0 6 + 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.

1.1 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

1.2 C alibration

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 .

1.3 CRC check

CRC check use 16bits form at , 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 result s of checking all the bytes except the CRC check value .

2 Functional block diagram

Picture 3.1 PZEM-0 04T-10A Functional block diagram

1 Wiring diagram

1 Other instructions

5.1 The TTL interface of this module is a paive interface, it requires external 5V power supply, which means, when communicating, all four ports must be connected (5V, RX, TX, GND), otherwise it cannot communicate.

5.2 Working temperature -20 ’ C ~ +60 ’ C。

About shping
Shping and Packaging All it will be double checked and well packed before sending.It will be dispatched within 2 business days after buyers pay for the order. It usually takes about 14 to 18 working days for delivering the package to the destination(for e areas,it may take a little longer). 

Special Announcement:
Please fill in the correct and detailed consignee, address and phone number in the order. For fast and correct delivery.If you do not receive order within 30 working days,please feel free to contact Customer Service before leaving Negative and Neutral Feedback, we will do our best to help you resoe the problem.TaxNo, you will only pay what is quoted as total cost at checkout, no more. You are not expected to pay any additional duties or taxes. If you are asked by Customs or our logistic partner to pay duties, please contact our Customer Service .

Your 100% satisfaction is very ant to us
If the product is not on good condition, You can return this product within 14 working days, please contact customer service center before returning.FeedbackYour satisfaction is our first priorityIf you receive the order and it is in good condition,we would be grateful if you would leave us 5 star Positive Feedback for the transaction.