45
isoHV425_D00082_03_M_XXEN/05.2020
8. IsoData data string (isoHV425-D4-4)
In IsoData mode, the ISOMETER® continuosly sends the entire data string with a cycle
time of approximately 1 s. Communication with the ISOMETER® within this mode is not
possible and no additional sender may be connected via the RS-485 bus cable.
IsoData is activated in the "out" menu
,
menu item "Adr",
when it has been set to Adr =
0. In this case, the "Adr" symbol flashes on the measured value display.
String
Description
!;
Start symbol
v;
Insulation fault location ' ' / '+' / '-'
1234, 5;
Insulation resistance
R
F
[kΩ]
1234;
System leakage capacitance
C
e
[μF]
1234, 5;
Reserved
+1234;
System voltage
U
n
[V
RMS
]
System voltage type: AC or unknown: ' '; DC: '+' / '-'
+1234;
Residual voltage
U
L1e
[V
DC
]
+1234;
Residual voltage
U
L2e
[V
DC
]
+123;
Insulation fault location -100 … +100 [%]
1234, 5;
Approximate unsymmetrical insulation resistance
R
FU
[kΩ]
1234;
Alarm message [hexadecimal] (without leading "0x")
The alarms are included in this value with the OR function.
Assignment of the alarms:
0x0002 Device error
0x0004 Prewarning insulation resistance
R
F
at
L1/+
0x0008 Prewarning insulation resistance
R
F
at L2/-
0x000C Prewarning insulation resistance
R
F
symmetrical
0x0010 Alarm insulation resistance
R
F
at L1/+
0x0020 Alarm insulation resistance
R
F
at L2/-
0x0030 Alarm insulation resistance
R
F
symmetrical
0x0040 Alarm undervoltage
U
n
0x0080 Alarm overvoltage
U
n
0x0100 Message system test
0x0200 Device start with alarm
1
Update counter, consecutively counts from 0 to 9.
It increases with the update of the insulation resistance value.
<CR><LF>
String end
