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INM MTL83xC PC Modbus Rev 4
There are some errors shown in the example above. This is because the MTL831C
#1 was disconnected from the Data Highway and then re-connected. It is typical
in this case to see a few errors. The Bad and Fragment packets received at the
MTL838C are due to Data Highway transitions due to unplugging and plugging
in the MTL831C #1. Similar things can occur if the MTL831C is reset via the PC
Software as described in the Devices section. Retransmits occur when an MTL831C
is disconnected from the Data Highway. A few of the Low msmt (measurement)
quaility occur on the MTL831C whenever it is powered up. The following table
provide details on the diagnostic items:
MTL838C Diagnostics
Total highway packets sent A running total of the number of packets of data sent to
either MTL831C.
Good packets received Number of good (no CRC error) packets received from the
MTL831Cs.
Bad packets received The number of packets that had a CRC error. Caused by
connecting or disconnecting MTL831Cs or by noise.
Fragmented packets received A count of the number of incomplete packets received.
This is usually noise or connect/disconnect of an
MTL831C.
MTL831C #1 Retransmits Number of times the MTL831C did not respond to a
command (the MTL838C is the bus master) and the
command had to be retransmitted. After 3 consecutive
missed responses the MTL831C is ‘dropped’ and must go
through re-initialization if it starts communicating again.
MTL831C #2 Retransmits Same as above but for the MTL831C with the Address
Jumper (#2).
MTL831C #x Diagnostics (x = 1 or 2)
Good packets received Number of good (no CRC error) packets received from the
MTL838C or other MTL831C if connected..
Bad packets received The number of packets that had a CRC error. Caused by
connecting or disconnecting MTL831Cs or by noise.
Fragmented packets received A count of the number of incomplete packets received.
This is usually noise or connect/disconnect of an
MTL831C.
High or low voltage events High or low voltage events detected by the main
microprocessor. Multiple events can be recorded for a
single voltage event.
PSoC3A:
Low/high voltage events
High or low voltage events detected by the A
measurement microprocessor. Multiple events can be
recorded for a single voltage event.
PSoC3A:
Low msmt quality events
The main microprocessor detected a low number of
measurements per second from the A microprocessor.
PSoC3B:
Low/high voltage events
High or low voltage events detected by the B
measurement microprocessor. Multiple events can be
recorded for a single voltage event.
PSoC3B:
Low msmt quality events
The main microprocessor detected a low number of
measurements per second from the B microprocessor.
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