1. Reading Holding Registers (Single or Multiple, in Words as the Smallest Unit): Frame Length: 8 bytes Device Address: 1~247 Function Code: 03H Data Address: 0~65535 Data Quantity: 1~65535 CRC Check: CRC16 Return Command Frame: Frame Length: 5 + N bytes Device Address: 1~247 Function Code: 03H Data Volume: Actual data read Return Data Meaning: a = HoldStart, n = DataNum - 1 CRC Check: CRC16 Command Error: 2. Writing to Holding Registers (Multiple, in Words as the Smallest Unit): Frame Length: 9 + bytN bytes Device Address: 1~247 Function Code: 10H Data Address: 0~65535 Data Quantity: 1~122 Bytes: bytN = DataNum × 2 Data: Specific byte data CRC Check: CRC16 Return Command Frame: Frame Length: 8 bytes Device Address: 1~247 Function Code: 10H Data Address: 0~65535 Data Quantity: 1~122 CRC Check: CRC16 Command Error:
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Galvanizing is a way of defending a steel surface from corrosion by delivering a surface coat of Zinc. The process is carried out by dipping the radiator in molten zinc bath which is upheld at a temperature of about 450 degrees.
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Device Address
Function Code
Address H
Address L
Data Amount H
Data Amount L
CRC H
CRC L
03 HHoldStart
DataNum
CRC high
CRC low
Device Address
Function Code
Data Volume
Data 1
Data N
CRC H
CRC L
13 H
Bytes of Return Data
NData (1~N)
CRC high
CRC low
VW a (VB a)
VW a (VB a+1) ... VW a+n (VB a+n)
Data(1) Data(2)...Data(N-1) Data(N)
Device Address
Function Code
Error Message
CRC H
CRC L
18 3 H
One byte error message
CRC high
CRC low
Device Address
Function Code
Address H
Address L
Data Amount H
Data Amount L
Byte Number
Specific Data
CRC H
CRC L
01 0 H
HoldStart
DataNum
bytN
~ bytN
CRC high
CRC low
Device Address
Function Code
Address H
Address L
Data Amount H
Data Amount L
CRC H
CRC L
11 0 H
HoldStart
DataNum
CRC high
CRC low
Device Address
Function Code
Error Message
CRC H
CRC L
19 0 H
One byte error message
CRC high
CRC low