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USER'S GUIDE
In the absence of a received tone signal, the center LED elements are lit. When the re-
ceived tone is at the "mark" frequency, the LED bars at the left side of the indicator will
be lit. Received "space" tones will light the bars at the right side of the indicator. A
properly-tuned RTTY, AMTOR or Packet signal will be symmetrically divided, with the
brightest bars at the ends of the indicator. A properly-tuned CW signal will shift the lit
bars from the center to the extreme-righthand side of the display.
In FM operation, tone frequencies are set by the transmitting station and can't be
changed by the receiving station.
2.2
Serial Port Configuration
Let's verify that your PK-232's serial port and data words are set up properly for your com-
puter. Should your monitor display garbled or incorrect characters or "funny" graphic sym-
bols, you can change the PK-232's serial port parity and word length. The common parity
and word length combinations are seven bits, even parity and one stop bit.
Your computer will probably accept the PK-232's default setting, even if it actually uses a dif-
ferent setting. If your computer requires eight data bits, you may have to set parity to
"none"; otherwise text may be interpreted as graphics or other special characters.
To set eight bits, space parity, type:
AWLEN 8
To return to seven bits, even parity, type
AWLEN 7
One of these combinations will satisfy most computers. You're more likely to require a differ-
ent setting if you have a "dump" terminal rather than a computer, or if you've configured
your computer's serial port for some special application. If your computer needs odd parity,
set
PARITY
to 1.
If your computer detects framing errors, try this for shorter characters:
AWLEN 7
For longer characters try:
AWLEN 8
2.3
Screen Display
Some computer and terminal programs are configured to certain default characteristics that
may, at first, seem incompatible with the PK-232. Follow these hints as you begin to "dia-
logue" with your new TNC.
PK232UG Rev. B 9/86
Figure 2-1 Bar-graph Tuning Indicator Display
(8-bit words)
PARITY 0
(7-bit words)
PARITY 2
(7-bit word)
PARITY 0
(8-bit words)
PARITY 1
(no parity bit)
(even parity)
(no parity it)
or
PARITY 3
2-4
INSTALLATION
22
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