User manual

5 Universal (General-purpose communication)

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5.5.3 03(Read holding register)

It reads contents of successive holding register. There is no Broadcast(Station designation of

Slave as 0). Available address is 00000 to 06047, it accords slave UW0000 to UW6047 of

GP/LP.

In case of reading 5 register data from UW0000 to UW0004 of GP/LP with station no.31

GP/LP

Station

Data(DEC)

Data(HEX)

UW0000 10 H000A

UW0001 20 H0014

UW0002 30 H001E

UW0003 40 H0028

UW0004 50 H0032

 Query

Station

Function

code

Start address

The number of read

CRC

0x1F 0x03 0x00 0x00 0x00 0x05 0xE6 0x71

① ② ③ ④ ⑤ ⑥ ⑦ ⑧

Item

Description

①Station

Slave station is 31, 31=(HEX)0X1F

②Function code

③Start address upper byte

It conforms 0000

④Start address lower byte

⑤the number of read register upper byte Total 5.5=upper(HEX)0X00+lower(HEX)0X05

⑥the number of read register lower byte

⑦CRC lower byte

⑧CRC upper byte