CeYeKo LUDP, User Manual, Page: 54 / 61

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Page 54
1 2 3 4, 5 6, 7 6 M-1, M M+1 M2
ADR 03H
Total
number
of bytes
Register
data 1
Register
data 2
…
… Register
data m
Crc code
low byte
Crc code
high
byte
When the slave receives the correct, the slave sends back:
1st byte adr: slave address code (=001~254)
2nd byte 03h: Return read function code
3rd byte: Total number of bytes from 4 to m (including 4 and m)
4th to m bytes: register data
M+1, m+2 bytes: crc16 check from byte 1 to m
When the slave receives an error, the slave sends back:
1 2 3 4 5
ADR 83H
Information co-
de
Crc code low
byte
Crc code high
byte
1st byte adr: slave address code (=001~254)
1st byte 83h: Error reading register value
3rd byte information code: see information code table
4th, 5th byte: crc16 check from byte 1 to 3
Function code 06h: Write a single register value
The host sends:
1 2 3 4 5 6 7 8
ADR 06
Register
address
high byte
Register
address
low byte
Data high
byte
Data low
byte
Crc code
low byte
Crc code
high byte