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Data Packet Processing; Table B-4 Coils - Spectris Particle Measuring Systems Airnet II 4-CH Operation Manual

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Appendix B : Modbus Protocol
Coils
00/01
00/02
00/03
00/04
00/05
00/06
00/07
00/08
Spare
00/33
00/34
00/35
00/36
00/37

Data Packet Processing

The unit can provide real-time data or queued data or both. There is only one section
of Input registers assigned for data to handle this information.
If the unit is setup to queue data then the data shown is the oldest data in the queue.
The data available coil bit will be set if there is data in the queue. The data available bit
can be cleared in which case that data element shown is popped-off of the queue. If
there is more data in the queue, the new data will be shown and the data available coil
bit will be set. If there is no more data in the queue, the data available bit will only be
set again once the next sample is completed.
If the queue is set to one, then the data shown is always the last data processed and is
representative of real-time data only. Since the queue is circular - the next sample will
replace the single one in the queue.
Queued data will always be available - even when not sampling.
If there is no data available - the input registers will yield zeros. This is done instead of
generating an execution exception so that the customer can simply read the data
packet, along with the Device Status, in one command.
B-6

Table B-4 Coils

Description (Coils)
Data Collection
On/Off
Data Available
Yes/No
Data Clear
Toggle
Reset Sensor
Toggle
Status LED: Green
On/Off
Status LED: Red
On/Off
External Alarm
On/Off
IEEE-754 Float
On/Off
24 spare coils
Set Digital Output 1
On/Off
Set Digital Output 2
On/Off
Set Digital Output 3
On/Off
Set Digital Output 4
On/Off
Set Digital Output 5
On/Off
Comment
Sampling Control
Data Available/Queue Control
Data Queue Delete
Reset control
Status LED: Green Control
Status LED: Red Control
External alarm
Modbus Float representation
Reserve "common" coils
Airnet® II 4-Channel Particle Sensors Operations Manual
Data Packet Processing
n/a
option 2
option 2
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