PK-88 OPERATING MANUAL
COMMAND SUMMARY
5 - 64
PK-88 - 139
TRIES
n
Mnemonic:
TRI
Default: 0
Parameters:
n
0 to 15 specifies the current RETRY level on the selected input channel.
TRIES retrieves (or forces) the count of 'tries' on the data channel presently selected.
If you type
TRIES
without an argument, the PK-88 returns the current number of tries if an out-
standing unacknowledged frame exists. If no outstanding unacknowledged frame exists, the PK-88
returns the number of tries required to get an ACK for the previous frame.
If RETRY is set to zero (0), the TRIES command always returns zero (0).
Use TRIES for gathering statistics on a given path or channel. TRIES is especially useful for com-
puter-operated stations (such as automatic message-forwarding stations) using less-than-optimal,
noisy HF or satellite channels or paths.
Using TRIES under these conditions automatically optimizes the PACLEN and MAXFRAME parame-
ters.
If you type
TRIES
with an argument, the 'tries' counter is forced to the entered value. Using this
command to force a new count of tries is not recommended.
TXDELAY
n
Mnemonic:
TX
Default: 30 (300 ms)
Parameters:
n
0 to 120 specifies ten-millisecond intervals.
The TXDELAY command tells the PK-88 how long to wait before sending packet frame data after
keying your transmitter's PTT line.
All transmitters need some amount of start-up time to put a signal on the air; some need more,
some need less. Some general rules apply:
Crystal-controlled radios with diode T/R switches are faster;
Synthesized radios need time for phase-lock loops (PLLs) to lock;
Radios with mechanical T/R relays need more time.
Experiment to determine the best TXDELAY value for a specific radio.
TXDELAY can also compensate for delays in the distant station's radio. If the distant station's radio
has slow recovery or release times when switching from transmit to receive, increasing your
TXDELAY may permit improved throughput by retarding the start of your data until the distant re-
ceiver has reached full sensitivity.
TXFLOW
ON|OFF
Mnemonic:
TXF
Default: OFF
Parameters:
ON
Software flow control for the PK-88 can be activated in Transparent Mode.
OFF
Software flow control for the PK-88 is disabled in Transparent Mode.
When TXFLOW is ON, the setting of XFLOW determines the type of flow control used in Transpar-
ent Mode.
When TXFLOW is OFF, the PK-88 uses only hardware flow control; all data sent to the terminal re-
mains fully transparent.
