Modbus register assignment of the ISOMETER®
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isoPV425_D00028_09_M_XXEN/05.2018
8.1.2.2 AT&T = Alarm type and test type (internal/external)
The alarm type is coded by bits 0 to 2. Bits 3, 4 and 5 are reserved and always
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 calculated
from the sum of the alarm type and the test type.
Bit 76543210 Description
External test
Internal test
Reserved
Reserved
Reserved
Alarm
Error
Alarm type
X X X X X 0 0 0 No alarm
XXXXX001 Prewarning
0 0 X X X 0 1 0 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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