Manual

User Guide: FAAST Fire Alarm Aspiration Sensing Technology® Modbus Protocol Schema 1
12
Sensor Status (Cont’d)
Address Size
(16-bit
words)
Parameter Name Type Description
52 ½ Ch 3 Air Temperature S8 Real-time sampled air temperature in Channel 3
(multichannel device only)
53 ½ Ch 3 Air Velocity Change S8 Percentage change from baseline air velocity in Channel 3
(multichannel device only)
54-55 2 Ch 3 Air Velocity Baseline F32 Average velocity during baselining in Channel 3
(multichannel device only)
56-57 2 Ch 3 Air Velocity Daily Min F32 Daily minimum air velocity realized on Channel 3
(multichannel device only)
58-59 2 Ch 3 Air Velocity Daily Max F32 Daily maximum air velocity realized on Channel 3
(multichannel device only)
60 ½ Ch 4 Air Temperature S8 Real-time sampled air temperature in Channel 4
(multichannel device only)
61 ½ Ch 4 Air Velocity Change S8 Percentage change from baseline air velocity in Channel 4
(multichannel device only)
62-63 2 Ch 4 Air Velocity Baseline F32 Average velocity during baselining in Channel 4
(multichannel device only)
64-65 2 Ch 4 Air Velocity Daily Min F32 Daily minimum air velocity realized on Channel 4
(multichannel device only)
66-67 2 Ch 4 Air Velocity Daily Max F32 Daily maximum air velocity realized on Channel 4
(multichannel device only)
68 ½ Smoke Particulate Display U8 Front panel particulate level (0-10)
69-70 2 Smoke Current Obs F32 Current Obscuration Level the Smoke Sensor is Detecting
71-72 2 Smoke Daily Max Obs F32 Maximum Obscuration Level the Smoke Sensor Detected
since 12am
73-74 2 Smoke Daily Min Obs F32 Minimum Obscuration Level the Smoke Sensor Detected
since 12am
75-76 2 Alert Threshold F32 Current Active Alert Threshold ( %/ft if US Standard or %/m
if metric)
77-78 2 Action1 Threshold F32 Current Active Action1 Threshold ( %/ft if US Standard or
%/m if metric)
79-80 2 Action2 Threshold F32 Current Active Action2 Threshold ( %/ft if US Standard or
%/m if metric)
81-82 2 Fire1 Threshold F32 Current Active Fire1 Threshold ( %/ft if US Standard or %/m
if metric)
83-84 2 Fire2 Threshold F32 Current Active Fire2 Threshold ( %/ft if US Standard or %/m
if metric)
85 1 Sensor Status U16 Bit 0 – Admin Unlock
1 = Unlocked, 0 = Locked
Bit 1 –Baselining
1 = set (configured from sensor action inputs)
Table 4. Sensor Status Modbus Holding Registers
∆ Information - Registers 35 can be configured by using Function code 6(single write) or Function 16 (multiple write).
∆ Warning!! Device threshold configuration variables should be set by the user to values scaled based on the Units configuration
setting. The detector will interpret the value differently for different Units settings. E.g. The device will interpret a 0.01 threshold
setting as 0.01 %/ft when Units setting is US Standard. The device will interpret a 0.01 threshold setting as 0.01 %/m when Units
setting is Metric.