In-Situ Aqua TROLL 400 Modbus and SDI-12 Reference Guide - Manual (Page 74)

8.29 Device Status
The device status register holds general status information. Each set bit represents a status
value. There are a limited number of standardized predefined status values that all devices will
support. These predefined status values are contained in the lower register. The upper register
is reserved for device specific status values.
Bit Category Description
0 Alarm Sensor high alarm
1 Warning Sensor high warning
2 Warning Sensor low warning
3 Alarm Sensor low alarm
4 Warning Sensor calibration warning
5 Alarm Sensor malfunction
6-7 N/A Reserved
8 Status Power management disabled
9 Status Device off line
10 Alarm Device hardware reset occurred
11 Alarm Device malfunction
12 Status No external power.
13 Warning Low battery – battery capacity < 5%
14 Warning Low memory – data log memory capacity < 5%
15 N/A Reserved
16-31 N/A Available for device-specific status
• Bits 0-7 of the device status register are reserved for sensor status. These bits are
the logical OR of bits 0-7 of the sensor status register in each sensor connection.
• Bits 8-15 of the device status register are reserved for common device status. Any bit
in this range that is not applicable to a device will be set to zero.
• Bits 16-31 of the device status register are available for device-specific status. Any
bit in this range that is not utilized by a device will be set to zero.
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