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Modem Mode
In MODEM mode, the TNC demodulates the audio signal from the radio on port
1 and passes this data through to its RS-232 port unmodified. No “protocol” ad-
justments are made to the data; the TNC simply acts as a dumb modem. In other
words, it simply reflects out the RS-232 port what it “sees” coming in the radio
port. For example, if ASCII information is received at 1200 baud, the TNC pres-
ents your computer with ASCII at 1200 baud. With a simple terminal program
running at 1200 baud too, you’d be able to copy the text.
To place the TNC in modem mode use the INTface command. At the cmd:
prompt, type INT MODEM and return. Then turn your TNC power OFF and
back ON.
To leave modem mode, send three Ctrl+C (command) characters to the TNC at
1200 baud. If ABAUD was set to something other than 1200, that setting will re-
main after you exit modem mode. Hence it may be convenient for you to set the
TNC to 1200 baud before entering modem mode.
+ Note: Some computers may lose some of the data stream if a full RS-232 cable is
used. This can occur because the RS232 CD line, which is “tied” to the TNC’s
receive LED, may be cycling up and down. In this case, set CD to EXTERNAL
before entering INT MODEM.
Copying Weather Broadcasts NWS EMWIN
MODEM mode can be used to copy emergency weather broadcasts by the Na-
tional Weather Service. The NWS Emergency Managers Weather Information
Network (EMWIN) is a wireless direct-to-computer information service that the
National Weather Service (NWS) provides with help from the Federal Emer-
gency Management Agency. The NWS feeds a constant stream of weather infor-
mation (@ 1200,8,N,1), from around the world, to a satellite orbiting the Earth.
Many cities are coming on line now to capture this stream and rebroadcast it on
fixed VHF commercial FM frequencies just above the 2-meter ham band.
Using your TNC in MODEM mode, with a PC and communications software,
you can copy these broadcasts. The content of the broadcasts may be plain ASCII
text (copyable with Pacterm - shipped with Kantronics TNCs) or graphics
(copyable with “WeatherNode” software, carried by Kantronics). Interpretation
Modes of Operation
Other Modes of Operation
User’s Guide
190
KPC-9612 Plus v 8.2
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