(N) Operation via communication and its settings
PARAMETERS
583
5
GROUP
N
Read Holding Register (reading of data of holding registers) (H03 or 03)
• Query message
• Normal response (Response message)
• Query message setting
• Content of normal response
a.
Slave Address
b. Function c. Starting Address d. No. of Points CRC Check
(8 bits)
H03
(8 bits)
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
L
(8 bits)
H
(8 bits)
a.
Slave Address
b. Function
e. Byte
Count
f. Data CRC Check
(8 bits)
H03
(8 bits)
(8 bits)
H
(8 bits)
L
(8 bits)
...
(n 16 bits)
L
(8 bits)
H
(8 bits)
Message Description
a Slave Address
Set the address to send messages to. Broadcast communication is not possible.
(Invalid when "0" is set.)
b Function Set H03.
c Starting Address
Set the address from which to start reading of data from the holding register.
Start address = start register address (decimal) - 40001
For example, when start register address 0001 is set, the data of holding register
address 40002 is read.
d No. of Points Set the number of holding registers to read. Data can be read from up to 125 registers.
Message Description
eByte Count
The setting range is H02 to HFA (2 to 250).
Twice the number of reads specified by (d) is set.
fData
The amount of data specified by (d) is set. Read data is output Hi bytes first followed
by Lo bytes, and is arranged as follows: data of start address, data of start address+1,
data of start address+2, and so forth.
Example) Read the register values of 41004 (Pr.4) to 41006 (Pr.6) from slave address 17 (H11).
Query message
Response message
Read value
Register 41004 (Pr.4): H1770 (60.00 Hz)
Register 41005 (Pr.5): H0BB8 (30.00 Hz)
Register 41006 (Pr.6): H03E8 (10.00 Hz)
Slave Address Function Starting Address No. of Points CRC Check
H11
(8 bits)
H03
(8 bits)
H03
(8 bits)
HEB
(8 bits)
H00
(8 bits)
H03
(8 bits)
H77
(8 bits)
H2B
(8 bits)
Slave Address Function
Byte
Count
Data CRC Check
H11
(8 bits)
H03
(8 bits)
H06
(8 bits)
H17
(8 bits)
H70
(8 bits)
H0B
(8 bits)
HB8
(8 bits)
H03
(8 bits)
HE8
(8 bits)
H2C
(8 bits)
HE6
(8 bits)
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