ISOMETER® Modbus register assignment
38
isoHV525_D00297_04_M_XXEN/05.2018
8.1.2
Measured value
Each measured value is available as a channel and consists of 8 bytes (4 registers). The
first measured value register address is 1000. The structure of a channel is always iden-
tical. Content and number depend on the device. The structure of a channel is shown
with the example of channel 1:
8.1.2.1
Float = Floating point value of the channels
Representation of the bit order for processing analogue measured values according to IEEE 754
S
= Sign;
E
= Exponent;
M
= Mantissa
8.1.2.2
AT&T = Alarm type and test type (internal/external)
1000
1001
1002
1003
HiByte
LoByte
HiByte
LoByte
HiByte
LoByte
HiByte
LoByte
Floating point value (Float)
Alarm type and
test type
(AT&T)
Range and
unit (R&U)
Channel description
Wo
rd
0x00
0x01
Byt
e
HiByte
LoByte
HiByte
LoByte
Bit
31
30
24
23
22
16
15
8
7
0
S E E E E E E E E M M M M M M M M M M M M M M M M M M M M M M M
Bit
7
6
5
4
3
2
1
0
Meaning
T
e
st
e
x
te
rnal
T
e
st
in
te
rnal
Reser
v
ed
Reser
v
ed
Reser
v
ed
Alarm
Fa
u
lt
A
larm t
y
pe
X
X
X
X
X
0
0
0
No alarm
X
X
X
X
X
0
0
1
Prewarning
0
0
X
X
X
0
1
0
Device fault
X
X
X
X
X
0
1
1
Reserved
X
X
X
X
X
1
0
0
Warning
X
X
X
X
X
1
0
1
Alarm
Summary of Contents for ISOMETER isoHV525
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