4
Table 4 provides a description of trouble flags and other diagnostic data for the
data reader. The example shown is with the following diagnostic data:
450E4C3E400E410E551B*
Table 4. Diagnostic Data
Byte
Description
Value
Example
1
Synchronization Nibble and
Product Identification Nibble
(SYNC)
HEX
15 = (not yet assigned)
25 = (not yet assigned)
35 = 4098-9601
35 = 4098-9605
35 = 4098-9607
45 = 4098-9602
55 to 58 = (for R&D use only)
59 to 5F (not yet assigned)
45
HEX
= Indicates Device
4098-9602
2
Sample Pulse
(PULSLO)
HEX
smoke sample value
0E
HEX
= 14
DEC
3
Alarm Threshold
(AT)
HEX
factory calibrated alarm threshold value
4C
HEX
= 76
DEC
4
Alarm Threshold - Factory
Clean Air
(DELTA)
HEX
factory calibrated alarm delta value
3E
HEX
= 62
DEC
5
Trouble and Status Flags
(STATUS)
HEX
(Several flags could be set
simultaneously therefore the
Hex code should be translated
to binary to see which bits
have been set.) See Table 5.
8 7 6 5 4 3 2 1 (BIT)
High sensitivity
(chamber contamination >
∆
/2)
Exceeded limit to chamber
compensation
Magnet test mode
Factory test mode
Thermistor alarm
Thermistor test error
(thermistor open)
Manufacturing location
(1=Westminster, 0 =other)
Alarm
40
HEX
= 01000000
BIN
BIT 7 Indicates manufacturing
location is Westminster
6
Mfg-Cal.Year (5 bits = 32
years) + P/O Week # Data
(3 bits)
(CAL-MSB)
HEX
year=1996+first 5 bits (see example)
week # = last 3 bits of this byte + first 3 bits of next byte
(6 bits total)
0E
HEX
= 00001110
BIN
Year = 00001
BIN
= 1
DEC
Year = 1996 + 1 = 1997
7
P/O Week # Data (3 bits) +
Firmware Ver. (5 bits)
(CAL-LSB)
HEX
First 3 bits are the rest of the week # data (of previous
byte) last 5 bits are the firmware version (up to 32
versions)
41
HEX
= 01000001
BIN
Week = 110010
BIN
= 50
DEC
Week = 50
Rev = 00001
BIN
=1
DEC
Rev. 1
8
Sample Pulse Average Value
(RAAV)
HEX
Chamber compensation value, used to adjust the actual
alarm threshold
0E
HEX
= 14
DEC
9
Thermistor Value
[4098-9602 ONLY]*
(THMVAL)
HEX
Thermistor ramp count, used to calculate the
temperature value
TEMP (F
°
) = [THMVAL
DEC
/2] + 27
55
HEX
= 85
DEC
[85/2] + 27 = 70
°
F
9/10
Check sum
(CHKSUM)
HEX
Count used to verify data integrity of bit stream
1B
HEX
= 27
DEC
*
Model Number 4098-9602 outputs 10 bytes of data. All other models output 9 bytes.
Diagnostic Data
Information in shaded cells are not for field use
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