MFJ-1270C/1274C COMPUTER INTERFACING
Page 17
NOTE: The serial port baud rate used between the TNC and the computer has
no relationship to the baud rate used over the radio. The serial port baud rate
you set on your TNC must match the baud rate used by your computer serial
port.
Turn on your computer and start the terminal program. Follow the directions for
the program you are using to match the computer's baud rate with that selected
on the TNC, and to set other options. Set your computer's port options to 7 bits
even parity and select either 1 or 2 stop bits.
Turn on your TNC. You should see a sign-on message, which should be a read-
able text message, printed on your computer screen. This demonstrates the
ability of your computer to accept data from your TNC. If you see nothing,
switch off your TNC for a few seconds, then on again. If you still see nothing,
verify your wiring and restart your terminal program. If you see gibberish on
your screen you should verify that you have set the same baud rate for the TNC
and the computer.
Verifying Serial Port Operation
Now that you have a terminal program and the hook-up cable for connecting the
MFJ TNC to your computer, you are ready to verify that MFJ TNC will
communicate with your computer.
1. Turn on your computer. Load and run the terminal program.
2. Set the parameter of the terminal program as follow:
word length: 8 bits
duplex: full
parity: none
stop bit: 1
baud rate: select on of the following:
300, 1200, 2400, 4800, 9600, 19,200
3. Locate the DIP switch in the back panel of the TNC. Set the Dip switch as
according to Table 2-4 follows:
Table 2-4. DIP switch settings for computer serial port baud rates.
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