Model IR4000M
26
decimal value must be scaled in proportion to an analog current value from 0-
21.7mA.
1.5.2 Operating Mode (Read-Only)
This register reports on the current operating mode for the IR400 detector. A
Read command returns the present IR400 mode, represented by the enabled bit.
The following table shows the mode represented by each bit in the 16-bit
register.
Table 15 Bitmap for Operating Mode Register (Read-Only Access)
Bit
7 6 5 4 3 2 1
0
Mode
Not Used
Initial
Mode
Remove
Gas (CAL
Finished)
Apply
Gas
CAL
Pending
Zero
Mode
CAL
Mode
Run
Mode
Bit Value
80 hex
128 dec
40 hex 64
dec
20 hex
32 dec
10 hex
16 dec
8 hex
8 dec
4 hex
4 dec
2 hex
2 dec
1 hex
1 dec
Bit
15 14 13 12 11 10 9 8
Mode
Not Used
Not Used
Not Used
Not Used
Not Used
Zero &
CAL
Mode
Gas
Check
Mode
Not Used
Bit Value
8000 hex
32768 dec
4000 hex
16384 dec
2000 hex
8192 dec
1000 hex
4096 dec
800 hex
2048 dec
400 hex
1024 dec
200 hex
512 dec
100 hex
256 dec
1.5.2.1 Mode Descriptions
A Read command returns the present IR400 mode, represented by the enabled
bit. Descriptions of the modes are provided below.
•
Run Mode:
IR400 normal operation mode, with LEL measurement taking
place.
•
CAL Mode:
Calibration in progress at 50% LEL.
•
Zero Mode:
Zeroing of the
IR400 in progress.
•
CAL Pending:
Waiting for gas to be applied for calibration to proceed.
•
No Gas or Not Steady:
IR400 calibration not proceeding since gas not
applied, or zeroing not successful.
•
Remove Gas (CAL finished):
IR400 calibration has finished, remove gas.
•
Initial Mode:
IR400 is initializing during powerup.
•
Gas Check Mode:
IR400 gas check is in progress (must apply gas or test
film)
•
Zero and CAL Mode:
Zeroing of the IR400 is in progress, directly followed
by calibration (once gas is applied).