General Monitors IR400, Manual

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Model IR400 MODBUS
11
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Run Mode: IR400 normal operation mode, with LEL measurement taking place.
Writing 1 to mode register allows to abort zero/calibration/gas check, if gas
concentration is less then 5% of Full Scale
•
CAL Mode: Calibration in progress at 50% LEL. Can write 0x0002 only during CAL
pending mode, which lasts 30 sec
•
Zero Mode: Zeroing of the IR400 in progress. Writing 0x0004 to mode register
sends the unit to zero mode.
•
CAL Pending : If 0x0002 is written to mode register during this stage, the unit starts
calibration, otherwise the unit returns to run mode in 30 seconds.
•
Apply Gas: Waiting for 50% LEL gas to proceed with calibration
•
Remove Gas (CAL finished): IR400 calibration has finished, remove gas.
•
Startup Mode: IR400 is initializing during powerup.
•
Gas Check Mode: IR400 gas check is in progress
•
Zero and CAL Mode: Zeroing directly following by calibration. Writing 0x4000 to
mode register will send the unit to zeroing mode, then to calibration, bypassing
calibration pending stage.
1.4.3 Status Error (0x0002)
A Read returns the bit map for any error that is presently occurring. The following table
shows the errors that are represented by each bit in the register.
Table 10: Bitmap for Status Error Delayed
Bit Position 3 2 1 0
Error
IR High
Beam Block Clean Windows
(Negative Gas
Reading) Partial Beam Block
Bit Value 8 hex / 8 decimal 4 hex / 4 decimal 2 hex / 2dec 1 hex / 1 decimal
Bit Position 7 6 5 4
Error Failed to Zero
Calibration Mode
Fail
Low Line Condition Wire Shortage
Bit Value 80 hex / 128
decimal 40 hex / 64 decimal 20 hex / 32 decimal 10 hex / 16 decimal