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DWG ID: 181-0101-00A
Date: 2003-09-26
255 from the number key pad on the right side of the keyboard, and then releasing the
ALT key.
A small plain-text file (called EXITKISS.TXT), containing these characters can be found
on the CD accompanying the TALON. Again, make sure that the terminal program is set
to the correct interface baud rate. Then send the text file containing the exit sequence
characters (as an ASCII or PLAIN TEXT file) to the TALON.
The TALON will exit KISS Mode, will return to TERMINAL interface mode, and will
display its “sign-on” message.
Otherwise, perform a HARD RESET. This will reset all commands to their factory
default settings, and allow the TALON to be re-initialized as a new unit.
9.4
Transparent Unproto Packet (TUP) Mode
9.4.1
TUP Mode Description
The TUP mode protocol utilizes the Unproto mode of the AX.25 protocol, allowing
digipeaters (VIA path specified with UNPROTO command) to be used in order to
effectively extend the range of a radio data system beyond simplex distance. This
protocol uses the standard AX.25 CRC-16 error checking to provide a high degree of data
integrity. Data is sent and received in a totally transparent fashion, allowing all ASCII
characters to be utilized (hex 00 through hex FF).
I.
Radio transmission is based on the
PACTIME AFTER parameter setting of the modem, the setting of the carrier detect
method, and the settings of the slot and persist channel access algorithm. Any data that is
received by the modem via the radio is output to the serial port
only
if it contains no
detectable errors. The received data will be
exactly
the same as the data that was sent to
the input serial port of the transmitting mode, without any address headers or added
formatting of the data. The modem is capable of selectively filtering monitored data from
or to different modem addresses using the BUDLIST command.
If digipeaters must be used to extend the range of the system, the information frame sent
by any modems in the system will be output to the serial ports of the receiving modems
only once, regardless of how many times it was received correctly. Also, data sent by any
modem will not be decoded by itself when the data is digipeated. The TUP mode protocol
provides an automatic "Time to Live" timer that inhibits any modem from transmitting or
receiving additional data until sufficient time has expired to allow in-progress data to
travel through all the digipeaters specified in the UNPROTO field of the originating
modem. Since the time for a given packet to travel the entire UNPROTO path may vary
due to the presence of other signals or noise, TUPTIME is used to impose an additional
delay time, if needed, during which each modem will be inhibited from decoding or
transmitting new data. This setting can be determined experimentally. It is important to
note that TUPTIME applies
only to the receiving modems
and should be set to the same
value at all sites. It is the responsibility of the host system to insure that additional data is
not transmitted until sufficient time has elapsed to allow data to travel to the last
