50
Teledyne API Model 465M O
3
Monitor User Manual
06160J DCN7969
8.6.
MODBUS Register Maps
8.6.1.
Notes on MODBUS registers
Concentration values in the MODBUS registers are always expressed in units of PPB
(parts-per-billion,) regardless of the concentration units setting of the monitor.
8.6.2.
Real-Time Concentration and Status Registers
(Read Only)
Decimal
Address Description
Register Type
Start
Bit
#
Bits
1
Stream Concentration (g/Nm
3
)
Float Inverse
0
32
3
Hi Alarm Status
Byte
0
8
3
Hi Hi Alarm Status
Byte
8
8
19
Sensor Reference Value
Float Inverse
0
32
21
Sensor Measure Value (mV)
Float Inverse
0
32
23
Sensor Pressure Value (mV)
Float Inverse
0
32
25
Sensor Gas Temperature (K)
Float Inverse
0
32
27
Sensor UV Lamp Temperature (
o
C)
Float Inverse
0
32
8.6.3.
Instrument Setup and Configuration Registers
(Read / Write)
Decimal
Address Description
Register
Type
Start
Bit
#
Bits
1030
Hi Alarm Value (PPM)
Float Inverse
0
32
1032
Hi Hi Alarm Value (PPM)
Float Inverse
0
32
1034
Hi Alarm Enable (PPM)
Byte
0
8
1034
Hi Hi Alarm Enable (PPM)
Byte
8
8
1035
Alarm Latch Mode
Byte
0
8
1038
Analog Range (PPM)
Float Inverse
0
32