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

Description

PZEM-004T AC Digital Multifunction Meter Watt Power Volt Amp Current Test Module
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:80
～
260V
1.1.2 Resolution: 0.1V
1.1.3 Measurement accuracy:
0.5%
1.2 Current
1.2.1 Measuring range:
0
～
10A(
PZEM-004T-10A
);
0
～
100A(
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:
0
～
2.3kW
(
PZEM-004T-10A
);
0
～
23kW
(
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: 0.00
～
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
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)
⚫
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
0x0005 Energy value
low
16
bits
1LSB correspond to
1Wh
0x0006
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
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
⚫
Voltage
is
0x0898, converted
to
decimal
is
2200,
display 220.0V
⚫
Current
is
0x000003E8, converted
to
decimal
is
1000,
display
1.000A
⚫
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
2.4 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
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
06
+ 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
06
+ 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.
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.
3
Functional
block
diagram
4 Wiring diagram
5
Other instructions
5.1
The TTL interface of this module is a passive interface, it requires external 5V power supply, w hich means, when communicating, all four ports must be connected (5V, RX, TX, GND), olherwis e ic cannot communicate.
5.2
W
orking teaperature
-20
，
C~+60
，
C,
Package include:
1x Digital Multi-function Meter
1x Coil
Payment Method
Returns Policy
Feedback
Payment Method
1. PayPal payment accepted only.
2. Items will be shipped to your eBay address. Please make sure it is correct.
Returns Policy
1. Customer satisfaction is our top goal. We believe our items are so outstanding. All products are quality checked. They are new and in good condition when shipped to our customers. We are convinced you will be happy with your Purchase.
2. If product is defective or damage upon arrival, or wrong product shipped, please contact us immediately. Returns accepted within 14 days of delivery date and item must be in original new condition, not worn or altered in any way with attached tags & wrap. Otherwise deal is final. Return shipping must be paid by buyer.
3. Please contact us first if you have any problems/questions/concerns. We will be happy to resolve any issues you may have in a cordial and friendly manner.
4. We appreciate your Postive Feedback, and will do the same in return. DO NOT leave negative feedback without first communication with us. Please allow max 2 business days for us to response.
Feedback
When you satisfied with our product and services please leave us positive feedback.
If a problem occurs, contact us immediately with any email request. Just contact us using the " Ask the seller a question" link on eBay.
Am 05.01.21 hat der Verkäufer die folgenden Angaben hinzugefügt: