Modbus register assignment of the ISOMETER®
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isoEV425_D00126_09_M_XXEN/03.2019
8.1.2.2 AT&T = Alarm type and test type (internal/external)
The alarm type is coded by the bits 0 to 2. Bits 3, 4 and 5 are reserved and al-
ways have the value 0. Bit 6 or 7 is usually set when an internal or external test
has been completed. Other values are reserved. The complete byte is calculat-
ed from the sum of the alarm type and the test type.
Bit 76543210 Description
Test external
Test internal
Reserved
Reserved
Reserved
Alarm
Error
Alarm type
X X X X X 0 0 0 No alarm
XXXXX001 Pre-warning
00XXX010 Device error
XXXXX011 Reserved
XXXXX100 Warning
XXXXX101 Alarm
XXXXX110 Reserved
XXXXX……… Reserved
XXXXX111 Reserved
Test
00XXXXXX No test
01XXXXXX Internal test
10XXXXXX External test
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