Timewave DSP-232, Operating Manual

Page: 103 / 271

Chapter 5 Packet Operation
“Call” is the callsign of the node function of your DSP. Stations can connect to your
MYGATE call, then issue a
connect request from there. This way, your station takes responsibility for acknowledgements of the user’s packets.
PAcket Immediate Command
Mode: Command Host: PA
Use the
PACKET
command to switch your DSP into packet radio mode from any other operating mode.
PACLen n Default: 128
Mode: packet Host: PL
“ n ”
0 to 255 specifies the maximum length of the data portion of a packet burst, in bytes.
0 Zero is equivalent to 256.
PACLEN sets the maximum number of characters to be sent in each packet burst. Most keyboard-to-keyboard
operators use the default value of 128 bytes for routine VHF/UHF packet services. Your DSP automatically sends a
packet when you reach “
n ” bytes. For example, if you set
PACLEN
to 256, after you enter 256 bytes’ worth of
information the DSP will send out a packet burst.
Reduce
PACLEN to 64 , or even 32 when working “difficult” HF radio paths.
PACTime EVERY|AFTER
n Default: AFTER 10 (1000 msec.)
Mode: packet Host: PT
“ n ” 0 to 250 specifies 100 mS increments.
EVERY
packet time-out occurs every “ n ” times 100 mS.
AFTER packet time-out occurs when “ n ” times 100 mS passes without input from the computer.
The
PACTIME parameter sets the amount of time, in 100 mS increments, that the DSP will wait for a character to
be entered before sending a packet in the Transparent mode. The
PACTIME
parameter is always used in
Transparent mode but is also used in Converse mode if CPACTIME is ON .
When
EVERY
is specified, the characters you type are “packetized” every n x 100 mS. When
AFTER
is specified,
the characters you type are “packetized” when input from the terminal stops after waiting n x 100 mS.
The
PACTIME timer is not started until the first character or byte is entered. A value of 0 (zero) for “ n ” means
packets are sent with no wait time.
PASSAll ON | OFF Default: OFF
Mode: packet Host: PX
OFF
Your DSP will accept packets with valid CRCs only .
ON Your DSP will accept packets with valid or invalid CRCs.
PASSALL turns off the packet error-detecting control and displays received packets with invalid CRCs. PASSALL
is normally turned
OFF
, which ensures that packet data is error-free by rejecting packets with invalid CRC fields.
With PASSALL ON , packets are displayed despite CRC errors.
MHEARD
logging is disabled since the call signs detected may be incorrect.
PErsist
n Default: 63
Mode: packet Host: PE
“n” 0 to 255 specifies the threshold for a random attempt to transmit.
5-42 September, 05