COMMANDS
19
FLow
ON | OFF
default OFF
KAM
/
KPC-4
All Modes except WEFAX
default ON
KPC-1
/
KPC-2
/
KPC-2400
Packet
When FLOW is ON, any character entered from the terminal will halt output to the terminal until
the current packet is completed (by SENDPAC, PACLEN or PACTIME). Canceling the current input
to the TNC or typing the REDISPLAY-line character will also cause output to resume. FLOW will
keep received data from interfering with with data entry. When FLOW is OFF, received data will be
"inter-leaved" with keyboard entry. If using a split screen terminal program, you should have
FLOW OFF and ECHO OFF to allow received data to be displayed while you type into the TNCs
type-ahead buffer.
In non-packet modes, you will probably want to run a split screen terminal program so that your
keyboard input will not be intermingled with received data. in this case, you should turn FLOW OFF
and ECHO OFF. You may also want to turn XMITECHO ON to have the TNC display the characters
to your terminal as they are actually being transmitted.
See also: canline, canpac, cpactime, echo, paclen, redisplay, sendpac, xmitecho
FRack
n
(n = 1 – 15)
default 4
KPC-1
/
KPC-2
/
KPC-2400
Packet
default 4/4
KAM
/
KPC-4
Packet
Each increment specifies 1 second intervals. After transmitting a packet requiring acknowledg-
ment, the TNC waits FRACK seconds before incrementing the retry counter and sending the packet
again. If the retry count (specified by the RETRY command) is exceeded, the current operation is
aborted. If the packet address includes relay requests, the time between retries is adjusted to
FRACK × ((2 × m) + 1) where m is the number of intermediate relay stations specified. When the
retried packet is sent, a random wait time is also added to avoid lockups where two units repeat-
edly collide with each other.
See also: connect, resptime, retry
FSkinv
ON | OFF
default OFF
KAM
RTTY/ASCII/AMTOR
This command controls the polarity of the FSK output of the HF radio connector. When OFF, MARK
is open-collector and SPACE is grounded. When ON the polarity of MARK and SPACE are reversed.
FUlldup
ON | OFF
default OFF
All Units except
KPC-1
Packet
When OFF, the data carrier detect signal is used as a packet collision avoidance signal. When ON,
the VHF modem is run full duplex and carrier detect does not inhibit transmission. The full duplex
mode may be useful especially for satellite operations using duplex radio setups. Full duplex should
not be used unless both you and the station you are communicating with have full duplex capabi-
lity.
KAM
/
KPC-4
The FULLDUP command is valid only if one radio port is disabled by setting MAXUSERS to 0/n or
n/0.
