Ir400 Command Register Details; Analog; Operating Mode (Read/Write) - General Monitors IR400 Manual

Clock Time Low
00DCh
Calibration code
00DDh
Reserved
00DEh
Calibration
00DFh
Event Count
Table 8: List of Modbus Registers

1.4 IR400 Command Register Details

1.4.1 Analog

A read returns a value, which is proportional to the 0-20mA output current. The current is
based on a 16-bit value. The master scaling is 0 - 65535 Decimal which corresponds to
the IR400 scaling which is 0 - 21.7mA.

1.4.2 Operating Mode (Read/Write)

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.
Bit 7
Mode
Not Used
80 hex
Bit Value 128
decimal
Bit 15
Mode
Not Used
8000 hex
Bit Value
32768
decimal
1.4.2.1 Mode Descriptions (0x0001)
A Read command returns the present IR400 mode, represented by the enabled bit.
Descriptions of the modes are provided below.
Hi byte = Minute,
Lo byte second:
Calibration clock
time
Calibration code
Reserved
Total Calibration
Event Count
Table 9: Bitmap for Operating Mode Register (Read-Only Access)
6 5
Remove
Initial
Gas (CAL
Mode
Finished)
20 hex
40 hex 64
32
decimal
decimal
14 13
Not Used Not Used
4000 hex 2000 hex
16384 8192
decimal decimal
10
Numeric 0 – 59 minutes
Value 0 – 59 seconds
Numeric 1 – zero, 2 -
Value calibration
Numeric 0
Value
Numeric 0 - 65535
Value
4 3
Apply CAL
Gas Pending
10 hex
8 hex
16
8 decimal
decimal
12 11
Not Used Not Used
1000 hex 800 hex
4096 2048
decimal decimal
Model IR400 MODBUS
R
R
R
R
2 1
Zero CAL
Mode Mode
2 hex
4 hex
2
4 decimal
decimal decimal
10 9
Zero & Gas
CAL Check Not Used
Mode Mode
400 hex 200 hex 100 hex
1024 512
decimal decimal decimal
0
Run
Mode
1 hex
1
8
256