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PK-232 – MBX OPERATING MANUAL
COMMAND SUMMARY
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RFR
ame ON|OFF
Default: OFF
Mode: Baudot and ASCII RTTY
Host: RG
Parameters:
ON -
Check received Baudot and ASCII characters for framing errors.
OFF - Print received Baudot and ASCII characters regardless of errors.
When RFRAME is OFF (default), Baudot and ASCII modes operate as always, that is characters are
copied based on the presence of the DCD signal.
When RFRAME is ON, the PK-232 checks received Baudot and ASCII characters for framing errors.
A framing error on a character in an asynchronous mode (such as Baudot and ASCII) occurs when
the bit in the stop position is detected to be the wrong polarity (the polarity of the start bit is sup-
posed to be space or 0, while the stop bit is supposed to be mark or 1). The unit stops copying
characters when 4 out of the last 12 characters had framing errors. Copy resumes when the most
recent 12 characters are error-free. This should significantly reduce the copying of garbage charac-
ters when no signals are present. When RFRAME is ON, characters are copied based on the recent
history of framing errors.
RXR
ev ON|OFF
Default: OFF
Mode: Baudot and ASCII RTTY/AMTOR
Host: RX
Parameters:
ON -
Received data polarity is reversed (mark-space reversal).
OFF - Received data polarity is normal.
Use the RXREV Command to invert the polarity of the data demodulated from the received mark
and space tones.
In some cases, you may be trying to copy a station that's transmitting "upside down" although it is
receiving your signals correctly. This is especially true when listening to signals in the Short Wave
bands. Set RXREV ON to reverse the data sense of received signals.
RXREV operates only at RBAUD and ABAUD speeds up to 150 baud.
SA
mple "n"
Immediate Command
Mode: Command
Host: SA
Parameters:
"n" -
20 to 255 specifies the sampling rate in baud.
This is a new operating mode with the Summer 1991 PK-232 firmware release for advanced users
interested in decoding unknown synchronous data transmissions.
SAMPLE is similar to the SBIT and 6BIT modes, but operates on synchronous data, whereas 5B1T
and 6BIT are used on signals known to be asynchronous. SAMPLE syncs up on any regularly-paced
data transmission and samples the data once per bit, packaging the data in groups and sending
the groups to the user for further analysis. The user can use SAMPLE to capture data bits from a
synchronous transmission, such as FEC, TDM or an 'unknown model' not identified by the SIGNAL
command. The transmission is actually sampled several times per data bit. The PK-232 does a ma-
jority vote an the last few samples to represent the value of the data bit.
One use for the SAMPLE command is to record the output to a disk file, then write a program to
analyze the results for synchronous/asynchronous, bit sync patterns, data decoding, etc.
SAMPLE data is captured in 6-bit units; the order of bit reception is MSB first, LSB last. The TNC
sends the data unit to the user with a constant of hex 30 added to each unit, the same as the
Содержание PK-232MBX
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