Model: PM-2160-A
Doc. Ref. no. : m20Aom201
Issue no. 02
User’s Manual
Page 22 of 36
7. MODBUS DETAILS
RS
– 485 interface is provided to communicate with the meter. The interface is available at the
terminals. (Refer Wiring Details)
When controllers are setup to communicate on a Modbus network using RTU (Remote Terminal Unit)
mode, each 8
–bit byte in a message contains two 4–bit Hexadecimal characters. The main advantage
of this mode is that, it
‟s greater Character density allows better data throughput than ASCII for the
same baud rate.
Use only following function codes for data read/write purpose
7.1 Modbus Register Map for 3P4W parameters
Data read Query
= [0 x Slave Id], [0 x Fun. Code], [0 x ADD. High], [0 x ADD. Low], [0 x No.
of data word, High], [0 x No. of data word. Low] [0 x CRC Low] [0 x CRC High]
Function Code
= 0X04
Address
– between 30001 to 30121
No. of data word
≤ 122 & in multiple of 2 as all data are of 4 Bytes [Long & Real]. Enter only
Even value (data word length).
Response
= [0 x Slave Id], [0 x Fun. Code
], [Byte count], [Data High], [Data Low] …... [Data.
High], [Data. Low] [0 x CRC Low] [0 x CRC High]
[Data Format:
Long & Real
]
S. No.
Address Measured parameter words Multiplication Factor
(if data type is long)
1
30001
Frequency
2
0.01
2
30003
1. PF
2
0.001
3
30005
2. PF
2
0.001
4
30007
3. PF
2
0.001
5
30009
A. PF
2
0.001
6
30011
1. Vrms
2
0.1
7
30013
2. Vrms
2
0.1
8
30015
3. Vrms
2
0.1
9
30017
A. Vrms
2
0.1
10
30019
Vrms 1*2
2
0.1
11
30021
Vrms 2*3
2
0.1
12
30023
Vrms 3*1
2
0.1
13
30025
1. Irms
2
0.001
14
30027
2. Irms
2
0.001
15
30029
3. Irms
2
0.001
16
30031
A. Irms
2
0.001
17
30033
Reserved
-
-
18
30035
1. Watt
2
1
19
30037
2. Watt
2
1
20
30039
3. Watt
2
1
21
30041
S. Watt
2
1
22
30043
1. Var
2
1
CODE
MEANING
ACTION
03
Read holding registers
Obtains current binary value in one
or more holding registers.
04
Read Input registers
Obtains current binary value in one
or more Input registers.
06
Preset single register
Place a specific binary value into a
holding register.
