Waveshare RS232/485 TO WIFI POE ETH (B) - Page 63

RS232/485 TO WIFI POE ETH (B) User Manual
www.waveshare.com
63
Attachment: Explanation of the meaning of serial port parameter bit.
Table Query Instructions
Name
Header
Baudrate
Bits
Checksum
Bytes
3
3
1
1
Note
Reduce false
positives by
three bytes
Three bytes
represent a baud
rate value, with the
high byte first
Different bits
represent
different
meanings,
See attached
table
The checksum of the
first four bytes,
ignoring any
carry-over
Example
(115200, N,
8,1)
55AA55
01C200
83
46
Example
(9600,N,8,1)
55AA55
002580
83
28
Form query reply instruction
No.
Name
Bytes
Note
1
Header
1
Fixed value 0xFF
2
Length
2
The total number of bytes after the length (excluding the length
itself) and before the checksum byte (excluding the checksum
byte).
3
Command
code
1
Command type, and the reply instruction corresponding to the
query instruction is 0x81.
4
AP number
1
Number of currently detected APs
5
SSID1
Indefinite
length
The SSID of router 1.
6
Terminator
1
The SSID terminator for router 1, with a fixed value of 0x00.
7
Signal
strength 1
1
The signal strength of router 1 network, ranging from 0 to 100,
corresponds to an actual value of 0% to 100%.
8
Terminator
2
Terminator of signal strength 1, 0x0D, 0x0A.
…
…
…
………
M
SSIDn
Indefinite
length
The SSID of router n.
M+1
end mark
1
SSID terminator of router n, fixed value 0x00.
M+2
Signal
strength n
1
The signal strength of router N network ranges from 0 to 100,
and the corresponding actual value is 0% to 100%.
M+3
Terminator
2
The terminator of signal strength n, 0x0D, 0x0A.
M+4
Checksum Bit
1
The cumulative sum of all bytes after the header (excluding the
header) and before the checksum (excluding the checksum).