13 TRX
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A TRX dump sequence is always closed with an ASCII 13 (carriage return), although this
last character is not transferred to the transceiver by the PTC-IIIusb, and the TRX dump
sequences from the PTC-IIIusb to the host computer are also closed with ASCII 13.
Example:
The control sequence FA; should be sent directly to a KENWOOD transceiver via TRX
dump. The ASCII character string for this is:
<Ctrl-E>#TX:46413B<CR>
Here, the <..> symbolizes an ASCII special character, CR = carriage return, and the
transceiver answers this command in its turn with a longer sequence, which the PTC-
IIIusb passes directly as a TRX dump to the terminal.
IMPORTANT: Some Transceivers (e.g. KENWOOD TS-450) ONLY accept remote
control commands in the receive condition. The terminal must take this into
consideration, in that (for example), during the linked state, each of the following
acknowledgments are checked to see if the command has been accepted by the
transceiver. If not, then the command must be repeated after approx. 100 msec, etc.
(Possibly with timeout and error message displays).
Timing of the TRX dump sequences:
Dump sequences to the transceiver are sent a few milliseconds after the closing <CR>, as
a continuous string, without pauses (idles).
Sequences from the transceiver are transferred, via the PTC-IIIusb, to the terminal as
dump sequences when...
1.
With KENWOOD or ICOM Transceivers, the appropriate end character (delimiter) is
recognized.
2.
The string length reaches 40 characters. That means that the maximum info length of
the TRX dump from the PTC-IIIusb to the terminal is 40 bytes, although with
YAESU transceivers the maximum string length is restricted to 19 bytes.
3.
If no further information is received from the transceiver for longer than 40 byte
lengths, and information from the TRX is available. (For SGC transceivers this idle
timeout has been reduced to 20 byte lengths).
There is only a few milliseconds delay between the recognition of the end condition, and
the beginning of the dump sequence,
Important Note:
Ctrl-E should no longer be used as
Hot-key
, e.g., as changeover or QRT key, when the
dump mode is activated. If, however, the Ctrl-E should be defined as a control character,
then the PTC-IIIusb will not give an error message, the processing of the Ctrl-E as
Hot-
key
being delayed when the dump mode is active, for a minimum of one character, and
the respective following characters are checked, to see if they are valid for the TRX dump
header, in other words, a buffering taking place.
The Frequency command in the
trx:-
menu, (without argument), requests the output of the
TRX frequency, but with an active dump mode, these transceiver outputs caused by the
F
command are also shown as dump sequences, and no longer as a decimal ASCII string.
The
F
command in this case, then also gives a TRX dump sequence. (This is, however,
not the case in remote control access, when the dump mode is ignored).
