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Page D-6
IsoAir 310P Aerosol Particle Sensor Operations Manual
Appendix D Modbus
Coils
Coils
1
The data collection coil will enable/disable sampling. It will start a sequence of samples if the
repeat count has been set.
2
The data available coil is used to both inform the host that data is now available and to delete
the next queued data packet (if desired).
3
The data clear coil will delete all data in the queue.
4
The reset sensor coil will reset the sensor.
5 & 6
The Green and Red LED (usually a single dual-color LED) can be set/read independently.
7
The external alarm does not exist on the IsoAir 310P
8
The IEEE float control will change the appropriate registers (refer to the map) from a dual-
register integer with fixed scaling to a dual-register IEEE-754 Float representation. This value
can also be set into non-volatile storage via the setup interface (“set instrument float n” –
where n=1 on or n=0 off).
9 – 32
Spare.
Table
D-4
Coils
Coils
Description (Coils)
Comment
00/01
Data Collection
On/Off
Sampling Control
00/02
Data Available
Yes/No
Data Available/Queue Control
00/03
Data Clear
Toggle
Data Queue Delete
00/04
Reset Sensor
Toggle
Reset control
00/05
Status LED: Green
On/Off
Status LED: Green Control
00/06
Status LED: Red
On/Off
Status LED: Red Control
00/07
External Alarm
On/Off
External alarm
n/a
00/08
IEEE-754 Float
On/Off
Modbus Float representation
Spare
24 spare coils
Reserve "common" coils
00/33
Set Digital Output 1
On/Off
option 2
00/34
Set Digital Output 2
On/Off
option 2
00/35
Set Digital Output 3
On/Off
option 2
00/36
Set Digital Output 4
On/Off
option 2
00/37
Set Digital Output 5
On/Off
option 2