HD404…
- 18 -
V1.2
5
MODBUS-RTU PROTOCOL (HD404ST…)
To operate with the Modbus-RTU protocol be sure that the dip-switch 1 (the one
closest to the terminal block) is set to OFF (downwards). The dip-switch can be set to
OFF even if the transmitter is powered, and the change is effective immediately.
Below is the list of registers:
TAB. 5.1: Input Registers
Address
Description
Format
3
Pressure in tenths of Pa (only HD404ST2...)
16-bit integer
4
Pressure in Pa (only HD404ST2... and HD404ST4...)
16-bit integer
5
Pressure in daPa (only HD404ST4... and HD404ST5AZ...)
16-bit integer
6
Pressure in hPa (only HD404ST4 without AZ option and
HD404ST5...)
16-bit integer
7
Pressure in kPa (only HD404ST5...)
16-bit integer
8
Pressure in hundredths of mmH
2
O (only HD404ST2... and
HD404ST4AZ...)
16-bit integer
9
Pressure in tenths of mmH
2
O (only HD404ST2... and HD404ST4...) 16-bit integer
10
Pressure in mmH
2
O (only HD404ST4... and HD404ST5AZ...)
16-bit integer
11
Pressure in thousandths of inchH
2
O (only HD404ST2... and
HD404ST4AZ...)
16-bit integer
12
Pressure in hundredths of inchH
2
O (only HD404ST4...)
16-bit integer
13
Pressure in tenths of inchH
2
O (only HD404ST4 without AZ option
and HD404ST5...)
16-bit integer
14
Pressure in inchH
2
O (only HD404ST5...)
16-bit integer
15
Pressure in thousandths of mmHg (only HD404ST4AZ...)
16-bit integer
16
Pressure in hundredths of mmHg (only HD404ST4...)
16-bit integer
17
Pressure in tenths of mmHg (only HD404ST4 without AZ option
and HD404ST5AZ...)
16-bit integer
18
Pressure in mmHg (only HD404ST5...)
16-bit integer
19
Pressure in thousandths of PSI (only HD404ST4 without AZ option) 16-bit integer
20
Pressure in hundredths of PSI (only HD404ST4 without AZ op-
tion and HD404ST5...)
16-bit integer
21
Speed in hundredths of m/s (only models with SR option)
16-bit integer
22
Speed in hundredths of ft/s (only models with SR option)
16-bit integer
23
Flow in l/s (only models with SR option)
16-bit integer
24
Flow in l/min (only models with SR option)
16-bit integer
25
Flow in m
3
/min (only models with SR option)
16-bit integer
26
Error register
16-bit integer
Note: Reading a register not available for a particular model returns the value -32768
(0x8000).
Note: If the pressure measurement is negative, the speed and flow registers return
zero.
Summary of Contents for Delta OHM HD404 Series
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