Hitachi NES1-004SB Quick Reference Manual page 164

Chapter 8 Communication Functions
(B) Read Holding Register [03h]
This function reads the contents of the specified number of consecutive holding registers (of
specified register addresses). An example follows below.
 Reading Trip monitor 1 factor and trip frequency, current, and voltage from an inverter having a
slave address "1"
 This example assumes the previous six trip factors are as follows:
NE-S1
Command
Register Number
Trip factor
Query:
No. Field Name
1 Slave address *1
2 Function code
3 Register start address *3
(high order)
4 Register start address *3
(low order)
5 Number of holding
registers (high order)
6 Number of holding
registers(low order)
7 CRC-16 (high order)
8 CRC-16 (low order)
Broadcasting is disabled.
Note 1:
Data is transferred by the specified number of data bytes (data size). In this case, 12
Note 2:
bytes are used to return the content of six holding registers.
The PDU Register Number are addressed starting at zero. Therefore register numbered
Note 3:
"0012h" are addressed as "0011h". Register address value (transmitted on Modbus line)
is 1 less than the Register Number.
D081 D081
(factor) (status)
0012h 0013h
Over-Current 04h
(E03)
Example
(Hex)
01
03
00
11
00
06
95
CD
D081
(frequency)
current)
0014h 0016h
9.9Hz 3.0A
Response:
No. Field Name
1 Slave address
2 Function code
3 Data size (in bytes) *2
4 Register data 1 (high order)
5 Register data 1 (high order)
6 Register data 2 (high order)
7 Register data 2 (low order)
8 Register data 3 (high order)
9 Register data 3 (low order)
10 Register data 4 (high order)
11 Register data 4 (low order)
12 Register data 5 (high order)
13 Register data 5 (low order)
14 Register data 6 (high order)
15 Register data 6 (low order)
16 CRC-16 (high order)
17 CRC-16 (low order)
8 - 10
D081 D081
(output (DC-bus
Voltage)
0017h
284V
Example
(Hex)
01
03
0C
00
03
00
04
00
00
00
63
00
1E
01
1C
0A
A3