Specifications

With UBIT 1B
ON, a master/slave relationship
is established in
packet
radio connections. This is
done to
reduce
the
possibility
of simultaneous transmissions
by both sides of a
packet
connection. In this mode,
the master
station sends either an l-frame
or
a
polling
frame
upon the expiration of FRICK
(or
FRACK if
FRICK
=
0).
The
FRICK or FRACK
timer
then
stafts counting again. The master station therefbre sends
packets
constantly,
even
if all its I-frames
have been acknowledged. The slave station sends nothing, not
even I-frames,
until it
receives
a
polling
frame from the master. A
station becomes the master upon its
transmission
of a SABM
(connect)
fiame;
a station becomes the
slave upon its transmission of a UA
(ac-
knowledgment of
the SABM)
fiame.
Recommended
settings for this method
of meteor scatter work
(both
stations should use these settings):
UBIT 78
ON
RETRY
U
AX25L2V2
ON(default)
MAXFRAME
/
CHECK
(doesn't
matter)
FRICK
n, where n is large
enough to allow the other station time to send the start of an acknowl-
edgment frame.
Ncrrn:
Frick
i.s an experimental mode and
we
welcome
any comments or suggestions
you
might have. Please
make them
in writing and direct
them to
Timewave's
Engineering Deportment. Thanks!
FUlldup
ONOFF
Mode:
packet
OFF Full duplex
mode is disabled.
ON Full duplex mode
is enabled.
When full duplex
mode is OFF
(defaul0,
the
PK-96
ftom its modem
to avoid collisions. When
ON. the
packets
individually.
Full-duplex
is useful for
full-duplex radio
operation,
used
unless both stations
can operate in full-duplex.
Default:OFF
Host:FU
makes use of the DCD
(Data
Carrier
Detect) signal
PK-96 ignores
the
DCD
signal and acknowledges
such as through OSCAR saiellites. It shouldn't be
GENDchar n
Mode:
GPS
Delault:
$0D
(CTRL-M.)
The
default GENDchar
of
$0D
requires the string to
end
with
a CR,LF to conform with the NMEA for-
mat. If
this is changed, the
sentence will end with whatever character is programmed. This
command does
not
need to be
programmed
for use with
GPS or
Loran
devices. It is intended for use with other
formats.
GlNl-l-ext fext
Mode: GPS
Default;
None
text-
Any combination of
characters up to a maximum length of
60 characters.
This
text will
be sent to the serial
port
when
the PK-96 is
powered
up with GPSMode NOT equal to zero.
This
text is intended for an initialization
string for OEM
GPS cards
requiring
setup after
power-down. If
not
programmed,
the PK-96
will send nothing
at
power-up.