Vaisala DPT146 - Manual (Page 69)

Appendix A _________________________________________________________ Modbus Reference
VAISALA ________________________________________________________________________ 67
Modbus Register Map
Table 22 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
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
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 Mdbus 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