Appendix A
Pulse Oximeter for Sleep Screening Operation Manual
A-3
The following table shows an example of data decompression:
BYTE IN HEX
DECOMPRESSION
88
Marker byte, expect the next byte to be SpO
2
.
60
SpO
2
value, HEX 60 equals to 96% SpO
2
decimal, expect the next byte to be Pulse Rate
52
Pulse Rate, HEX 52 equals to 82 bpm decimal, expect the next byte to be the byte
divided into low and high nibbles
f0
Low nibble is 0, SpO
2
= 96% + 0 = 96%;
High nibble is –1, Pulse Rate = 82bpm – 1 = 81 bpm
ef
Low nibble is -1, SpO
2
= 96% - 1 = 95%;
High nibble is –2, Pulse Rate = 82bpm – 2 = 80 bpm
30
Low nibble is 0, SpO
2
= 95% + 0 = 95%;
High nibble is 3, Pulse Rate = 80bpm + 3 = 83 bpm;
Note! Your service representative can supply an ANSI C decompression routine.
