Input Registers
Chapter 5 Modbus Protocol
MiniCapt Remote Microbial Air Sampler Operations Manual
Page 5-3
Input Registers
The input registers are in two sections:
Configuration
and
Data
.
The
Configuration
section description begins on this page.
The
Data
section description begins on page 5-5.
Configuration Section
The
Configuration
section contains:
• Modbus Map Version
• Sensor Firmware Version
• Product Name
• Flow Rate and Volume Scale Factors
• Flow Rate
• Number of Channels (Particle & Analog)
30001:
Modbus Map Version
This is a fixed value representing the version number of
the Modbus map multiplied by 100. The version can
change if/when the basic structure of the map and/or
processing associated with the structure of the map is
adjusted.
Note
: Additions and/or definitions to the spare entries
will not generally require a version change - they will
simply be annotated as to the applicability to that
particular instrument. The same reasoning is applied to
unique registers and/or coils for a particular instrument –
they will simply be annotated as being specific to that
device.
30002:
Sensor Firmware Version
This is a value representing the version number of the
flow controller firmware multiplied by 100.
30003 - 30010:
Product Name
Product name entered using ASCII bytes and positioned
as shown in the map.
30011:
Flow Rate Scale Factor
The power of 10 multiplied to the flow rate and then
entered into registers 30013/30014, 30222/30223 and
30229/30230. Used when the floating-point
representation is disabled. The MiniCapt uses a value of 2
to represent a fixed scaling factor of 100 for flow rate.
30012:
Volume Scale Factor
The power of 10 multiplied to the volume and then
entered into registers 30224/30225 and 30231/30232.
Used when the floating-point representation is disabled.
The MiniCapt uses a value of 5 to represent a fixed scaling
factor of 100000 for volume.
