34/39
Instruction code
03
Starting address
00 00
Checkout bit
2 bytes CRC
Examples 01 03 00 00 CRC
7.7.2 Response instruction
constituent part
Numerical value
Address bit
01
Instruction code
03
Starting address
** **
(
Starting address, The value is 1-128
)
Address length
** ** (number of channels,The value is 1-24.)
Data body
The number of channels is *2 byte data.
Checkout bit
2 bytes CRC
Explain
Each packet returns up to 24 channels of data.When the number of channels is greater
than 24, packets are sent to the data.
Examples
01 03 10 00 50
。。。。。。
CRC
7.8 Read historical data (to be improved)
constituent part
Numerical value
Address bit
01
Instruction code
04
Packet length(Packet length)
00 01 00 07
Data body
16 bytes, each representing one way, 0: no data; 1:
fetching data.
Checkout bit
2 bytesCRC
Numerical value
Examples 01 00 1A 0B 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 CRC
Take first, third road monitoring data.
7.9 Response instruction
constituent part
Numerical value
Address bit
01
Instruction code
04
Packet
length(Packet
length)
00 01 00 07