high as long as it can receive data and pulls it low to tell the TNC to stop sending data.
The TNC always uses hardware flow control, so only wire the RTS and CTS pins if your
computer program is also using hardware flow control.
HyperTerminal uses hardware flow control in its default settings, but some
communication software does not.
Convers Mode vs. Transparent Mode
In the Convers Mode there are many special characters. To list a few:
Command
Default
Description
SENDPAC
<Ctrl+M>
Causes a packet to be formed
DELETE
<Ctrl+H> Backspace
character
REDISPLAY <Ctrl+R>
Redisplays the keyboard buffer
CANLINE
<Ctrl+X>
Cancels a line
STOP
<Ctrl+S>
Stops output from TNC to computer
PASS
<Ctrl+V>
Pass a special character
These characters are all very useful when having a packet conversation with someone.
If you want to send a packet you hit the return. If you make a mistake you can erase
characters, using the delete or backspace key, or kill the whole line with <Ctrl+X>. And
if you really want to transmit one of these characters, you can always precede it with a
PASS character.
Transparent Mode was designed for the sending of files, whether they be ASCII data
files or program files. Special characters have no meaning to the TNC in transparent
mode, they are just characters to be put in a packet and sent to the radio.
In Transparent Mode, a SENDPAC character will not cause data to be formed into
packets; instead, packets are formed at a rate that is set by PACTIME.
All monitor commands are treated as OFF in Transparent Mode. All you will see is what
is being sent to you. You would probably want to set USERS to 1 so no one interferes
with the transfer. The setting of ECHO is also ignored. Even if ECHO is ON Transparent
Mode will not echo to the attached terminal. Some programs allow for local echoing to
the screen while uploading.
Exiting Transparent Mode
Getting into the Transparent Mode is easy: you just type a “t” in Command Mode. But
since Transparent Mode allows the sending of all characters you can not get out of
Transparent Mode by just typing a <Ctrl+C> (COMMAND character) as in Convers
Mode. In order to get out of Transparent Mode, you must follow a special sequence, or
use a modem break if your program supports one. The special sequence must be
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