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Appendix A _________________________________________________________ Modbus Reference
VAISALA ________________________________________________________________________ 61
Modbus Register Map
Table 21 Modbus Register Map
Logical
Address
(decimal)
PDU Address
(hexadecimal)
Register Description
Data
Format
Register
Type
Notes
5
00 04
T
(measured)
LSW
MSW
32-bit
float
read-only
°C
6
00 05
7
00 06
T
d/f
(measured)
LSW
MSW
32-bit
float
read-only
°C
8
00 07
11
00 0A
T
d/f
(atm)
(measured)
LSW
MSW
32-bit
float
read-only
°C
12
00 0B
21
00 14
H
2
O (measured)
LSW
MSW
32-bit
float
read-only
ppm
v
22
00 15
45
00 2C
P (measured)
LSW
MSW
32-bit
float
read-only
bara
46
00 2D
47
00 2E
ρ (measured)
LSW
MSW
32-bit
float
read-only
kg/m
3
48
00 2F
49
00 30
P
norm
(measured)
LSW
MSW
32-bit
float
read-only
bara
50
00 31
513
02 00
Fault status
16-bit
boolean
read-only
1 = no errors
514
02 01
Online status
16-bit
boolean
read-only
1 = online data
available
516
02 03
Error code
LSW
MSW
32-bit bit
field
read-only
0 = no errors
517
02 04
775
03 06
Molar mass of other
gas (set value)
LSW
MSW
32-bit
float
read/write
kg/mol
776
03 07
781
03 0C
Gas mixing ratio
(set value)
LSW
MSW
32-bit
float
read/write
0 …100 % of
SF
6
782
03 0D
783
03 0E
Pressure
normalization
temperature (set
value)
LSW
MSW
32-bit
float
read/write
-100 … 100°C
784
03 0F
1283
05 02
Automatic purge on/off*
16-bit
boolean
read/write
1= automatic
purge on
1284
05 03
Start-up purge on/off*
16-bit
boolean
read/write
1 = start-up
purge on
1285
05 04
Purge in progress*
16-bit
boolean
read/write
1 = purge in
progress, write
1 for manual
start
1537
06 00
Address
16-bit
integer
read/write
1…255 (1 …
247 allowed in
Modbus)
*Device specifications are valid only if purge functions are kept enabled. Do not modify registers 1283, 1284,
and 1285. Regular purge is needed to guarantee accurate measurements. Modify only if instructed to by Vaisala.
PDU address
Actual address bytes used in a Modbus Protocol data unit
LSW
Least significant word (bits 15 … 0)
MSW
Most significant word (bits 31 … 16)
16-bit integer
Numeric value in range 0 … 65535
16-bit boolean
Numeric value, 0 or 1
32-bit bit field
32 individual values, each 0 or 1
32-bit float
Floating point, IEEE 754 format
read-only
Register value cannot be changed with Modbus functions
read/write
Register value can be changed with Modbus functions
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 5 4
- CHAPTER 6 4
- CHAPTER 7 5
- CHAPTER 8 5
- APPENDIX A 5
- List of Figures 6
- List of Tables 6
- GENERAL INFORMATION 7
- Version Information 8
- Related Manuals 8
- Documentation Conventions 8
- Recycling 10
- Regulatory Compliances 11
- Patent Notice 11
- Trademarks 11
- Software License 12
- Warranty 12
- PRODUCT OVERVIEW 13
- Basic Features and Options 14
- Transmitter Parts 15
- Weather Shield 16
- FUNCTIONAL DESCRIPTION 17
- Sensor Technology 18
- BAROCAP® Technology 19
- DPT145 Start-up Sequence 20
- INSTALLATION 21
- Selecting the Location 22
- CAUTION 23
- Standard Wiring 28
- Installation 29
- OPERATION 30
- Serial Communication 31
- List of Serial Commands 33
- Device Information 34
- Show Currently Active Errors 35
- Show Command List 35
- Serial Line Output Commands 36
- Set Output Interval 37
- Output a Reading Once 37
- Set Mixing Ratio 38
- Select Unit 41
- Set Serial Line Settings 42
- Set Transmitter Address 42
- Other Commands 43
- Show Transmitter Uptime 44
- Reset Transmitter 44
- Restore Factory Settings 44
- Modbus Communication 45
- MAINTENANCE 47
- 1108-039 48
- TROUBLESHOOTING 50
- Error Messages 51
- Unknown Serial Settings 52
- Technical Support 52
- Product Returns 53
- TECHNICAL DATA 54
- Table 16 Outputs 55
- Table 17 General 56
- Spare Parts and Accessories 57
- Dimensions in mm 57
- 1311-249 58
- 1108-018 58
- MODBUS REFERENCE 60
- Modbus Register Map 61
- *M211371EN* 63
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