Information

file:///T|/Neu/RS232%20Protokoll.txt
Item MSB LSB Sum CR
Item “P” (50h): CntR (CO2 concentration)
MSB 8 bit Data Msb
LSB 8 bit Data Lsb
Sum Item+MSB+LSB=SUM
CR 0Dh, End of the message
0.0.2 Example
1.Relative Concentration of CO2 (CntR)
50 10 00 60 0D
Item 50hà “P” the item code of CntR
Data MSB 10h
LSB 00h
Relative Concentration of CO2 = 1000ppm
Sum CheckSum 50h+10h+00h=60H (Only Low Byte)
CR 0Dh à’Carriage Return’ means End of Message
2.Object Temperature (Tamb)
42 12 C3 17 0D
Item 42hà “B” the item code of Ambient temperature
Data MSB 12h
LSB C3h
Real Temperature Value [Hex2Dec (12C3h)]/16-273.15= 27.03 ℃
Sum CheckSum 42h+12h+C3h=17h (Only Low Byte)
CR 0Dh à’Carriage Return’ meas End of Message
file:///T|/Neu/RS232%20Protokoll.txt [02.12.2009 11:20:20]