ApexPortable MODBUS Register Map v1.50
248083440-1 Rev 5 A-7
Command
Register
The Command Register (40002) is used to make the device perform an
action. The register performs an action when an integer value is written
to it. The action is completed when the device sends a MODBUS
response. When this register is read, it always returns a zero. Table A-
6 displays the registers’ values and related actions.
6 ApexPortable:
BACKGROUND STATUS: Set to 1 when unit’s pho-
toamp background is out of spec, else set to 0
7 ApexPortable:
PHOTODIODE STATUS: Set to 1 when photodiode
has failed, else set to 0
8 ApexPortable:
CALIBRATION DUE DATE STATUS: Set to 1 when
unit is past calibration due date, else set to 0
Table A-5 Additional Device Status (40056)
Bit Description
Table A-6 Command Register
Value Action
1 Saves all writable 4xxxx register values to the EEPROM.
2 Reserved for future use.
3 Clears the Data Buffer. Record count is set to zero.
4 Saves the instrument parameters in the 40xxx registers to the
EEPROM. Parameters include Sample Time, Hold Time, Initial
Delay, and Location.
11 Instrument Start (Automatic Counting).
Particle Counters
: Uses defined Initial Delay, Hold Time, Sample
Interval and counting mode. Instrument executes samples and holds
until an Instrument Stop command is issued. For instruments with
pumps, this command will start the pump.
Manifold Controller: Uses defined Manifold Sequence. Stops
counting and changing position when Instrument Stop command is
issued.
12 Instrument Stop. Aborts current sample. Stops pump, if applicable.
Stops data collection.
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