SR50A Sonic Ranging Sensor
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<STX>33;1838;194;11011;2C<CR><LF><ETX>
SUM =
02+33+33+3B+31+38+33+38+3B+31+39+34+3B+31+3
1+30+31+31
+3B+0D+0A+03
=0x3D4
Use Last byte only (D4) and calculate two’s complement
= 100
–
D4 = 2C
<CR>
Carriage return character. 0x0d in hexadecimal or 13 in
decimal
<LF>
Line feed character. 0x0a in hexadecimal or 10 in decimal
<ETX>
End of transmission character. 0x03 in hexadecimal or 3 in
decimal
3.9.2 Information Message Output
The measurement output string for the SR50A is as follows:
<STX>aa;SSSSS;H.H;F.F;BBBBB;WWWWW<CR><LF><ETX>
<STX> is the hex character 0x02 (2 in decimal)
aa
These two characters are the serial address of the sensor. The
default is 33. Note this is two ASCII characters of 0x33 in
Hexidecimal or 51 in decimal.
SSSSS
This is the serial number of the sensor
H.H
This is the hardware version of the sensor
F.F
This is the firmware version of the sensor
BBBBB
This is the checksum of the boot code.
