User's Manual

Chapter 4 Operation
The top half of the display contains five columns. The channel activity displays which of
the 8 receiver channels are receiving valid data using a + or * symbol. Channel 1 appears
at the left of the channel display, and channel 8 appears at the right. The next field is the
meter reading. This data is not checked for any errors, and will be displayed with or
without errors. Next is the interrogation count field. This is the number of times an
interrogation has been sent for a particular transponder. This field starts at 0 upon
entering a new id, whenever the count rolls over from 99 , or whenever the ‘0’ key is
pressed.
The percentage of successful replies field is a running percentage of good replies which
the MMI has received. As in the count field, this percentage is set to 0 by entering a new
id or pressing the 0 key. The final field is the BCH/Tamper indication. A ‘*’ symbol
indicates that a reply with a good BCH code and no tamper indication is being received.
A ‘T’ symbol indicates that a good BCH code and a tamper indication is being received.
The ‘+‘ symbol indicates that the received data does not pass BCH error code detection,
but the receiver channel is locked on to the incoming data. This most often occurs if the
receiver delay is invalid, and does not match the transponders delay. An ‘M’ symbol
indicates that a good BCH code and a meter reading checksum error is being received,
most likely indicating that a transponder has undergone a software reset. The ‘M’ status
can only be reset in the transponder by reprogramming it.