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P R A X S Y M
Errors
Either host or PathTrax unit will discard a packet if it contains an
error. The PathTrax Transmitter and Receiver will respond
differently to a packet with an error using a code to help identify
the source of the error. If the host receives a packet that contains
an error, it must re-issue a command to obtain the desired
response. Error response codes are listed below:
Invalid commands sent to the PathTrax Receiver will be
acknowledged with an error response. An error response will
consist of 4 ASCII bytes followed by a carriage return. The error
code consists of the two characters ER followed by a two-character
error status code.
ERIC<CR> Invalid command
The command was not recognized. Verify the command you
are sending is valid.
ERIN<CR> Invalid number or range
The data included in the previous command was invalid or
out
of
range.
ERIM<CR> Incompatible Mode for command
The command was not recognized because it was entered in
an incompatible mode.
ERNI<CR> Not Initialized, Shield Level not available
Response to the “SL?” query when the Receiver has not been
initialized with the Transmitter.
User Commands
Note: The under score “_” indicates a space (hex 20) is sent in the
command
Note: <CR> indicates that the user should press the “enter” key.
Receiver Commands
SS?<CR>
Returns the last measured signal strength
in the form (-)XXX (dBm) for the current
band.
Example: -70
SL?<CR>
Returns the last measured shield level in the
form XXX (dB) for the current frequency.
Example: 103
