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9
Ice Detector RS-422 String Format
Table 3. Serial String Format
Byte Bit
Definition
Comments/Interpretation/Range
0 (First)
7 (MSB)
String ID
Presently defined as 00
6
May add additional strings in future
5 - 3
Unused
2
Probe Heater State
1- Heater On
0- Heater Off
1
Ice Output
1- Ice
0- No Ice
0
Status Output
1- Fail
0- (OK) No Fail
1 -2 MSO FREQUENCY
MSO Count in Hex
Frequency = 774060000/Dec (MSO)
3 - ERRSTAT1
7
Unused
1 = Active
6
MSA Fail, Too High
5
MSO Fail, Too Low
4
EEPROM Fail
3
RAM Fail
2
ROM Fail
1
Watchdog Fail
0
Power Interrupt Timer Fail
4 - ERRSTAT2
7 - 6
Probe Heater Failure
00 = Probe Heater OK
01 = Probe Heater Always ON or OPEN
10 = Probe Heater Always OFF
11 = Probe Heater ON with 1 Enable
5
De-Icing Fail
1 = Active
4
Unused
3
Unused
2
Unused
1
Unused
0
Unused
17