Programming instructions

Downloading and Using Files
Data Transfer Troubleshooting
Chapter 4 191
User File Download Problems
Data Requirement Reminders
To avoid user file data download problems, the following conditions must be met:
1. The user file selected must entirely fill the data field of each timeslot.
2. For binary memory downloads, the user file must be a multiple of 8 bits, so that it can be
represented in ASCII characters.
3. Available PRAM must be large enough to support both the data field bits and the framing
bits.
Table 4-4 User FIR File Download Trouble - Symptoms and Causes
Symptom Possible Cause
No data modulated
Not enough data to fill a single timeslot.
If a user file does not completely fill a single timeslot, the
firmware will not load any data into the timeslot. For
example, if a timeslot’s data field should contain 114 bits,
and only 100 bits are provided in the user file, no data will
be loaded into the data field of the timeslot. Therefore, no
data will be detected at the RF output.
At RF output,
some data modulated,
some data missing
Data does not completely fill an integer number of
timeslots.
If a user file fills the data fields of more than one timeslot in
a continuously repeating framed transmission, the user file
will be restarted after the last timeslot containing
completely filled data fields. For example, if the user file
contains enough data to fill the data fields of 3.5 timeslots,
firmware will load 3 timeslots with data and restart the
user file after the third timeslot. The last 0.5 timeslot worth
of data will never be modulated.