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RS-232 transfer protocol
RS-232 the transmission end is
one way transfer via the three wires (touch
ground) to input and output.
Using the original transmission line or cable under 10m is recommended.
Baud rate: 57600, 19200, 9600, 4800
Transfer status: / 8 / N / 1
Transfer content: (8BIT)
Read Holding Registers by Function 03H
A. Request Data Frame
Ex: Read the data from address 0x0000 (Read 4-byte of data from address
0x0000)
Slave
address
Function
Starting
address
Hi
Starting
address
Lo
No. of
Byte
Hi
No. of
Byte
Hi
CRC
Lo
CRC
Hi
01H
03H
00H
00H
00H
04H
44H
09H
Response Data Frame
Ex Response value=4-Byte
Response Data= ”80003”
Slave
address
Function
Byte
count
Data
Hi
Data
Middle
Data
Lo
Data
Last
CRC
Lo
CRC
Hi
01H
03H
04H
00H
01H
38H
83H
F9H 92H
0x00013883=80003,Real value = 80003/100,Real value =800.03
B. Request Data Frame
Ex: Read the data from address 0x0000 (Read 8-byte of data from address
0x0000)
Slave
address
Function
Starting
address
Hi
Starting
address
Lo
No. of
Byte
Hi
No. of
Byte
Hi
CRC
Lo
CRC
Hi
01H
03H
00H
00H
00H
08H
44H
0CH
Response Data Frame
Ex Response value= 8-Byte Response Data’s =”80003”and”81067”
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