In-Situ Aqua TROLL 400 Modbus and SDI-12 Reference Guide - Manual (Page 77)

• Bad Message Counter – count of number of improperly formatted messages received
(i.e. bad CRC). Bad messages might not be associated with this device because it is
impossible to determine if a bad message was addressed to the device or not.
• Exception Response Counter – count of the number of messages received that were
rejected with a Modbus exception response.
8.36 Sensor Connection Registers
8.36.1 Max Sensor Connections
Each probe or controller can present up to 32 sensor images to the outside world. These
sensors may be real sensors plugged into physical ports, sensors on the internal PCB or it may
be virtual sensors created from derived information. This register tells how many sensor images
are being presented by the probe or controller at the time it is read.
8.36.2 Sensor Connection Status
Each bit, when set, indicates that the probe or controller is actively presenting a sensor image
on the corresponding port. The bit position 0-31 is used to determine the sensor map register
group to use to control the sensor or access its data block.
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