TNC-Pi User Guide
-20-
6/25/2017
p
is the parameter number (1
–
7) and
v
is the new parameter value.
The parameters that you are most like to use are:
Parameter
value
Description
Notes
1
Sets the
TXDelay
With TNC-Pi, you can set the
TXDelay
either in
software using the
pitnc_setparams
program or in
hardware using R6. Setting this parameter to 0
causes the TNC-Pi R6 potentiometer to determine
the value.
7
Sets the I2C
address
Setting this to 0 causes data communication on the
serial port (default), any other value up to 63 will
cause I2C to be used with the TNC using this
address. This permits you to use multiple TNC’s
with the same Raspberry Pi.
The BPQ software for Raspberry Pi is currently in beta and can be found at:
http://www.tnc-x.com/InstallingLINBPQ.htm
If you ever need to reset these parameters to their original factory values, this
can be done by powering down, turning the TXDelay potentiometer all the way to
minimum and then powering back up. You should see the yellow LED flash once
per second. When you see it flash, you’ll know that the parameters have all been
reset. The power the device back down, move the TXDelay off of minimum and
power the device back up.
Running Applications other than LinBPQ with TNC-Pi in
I2C
mode.
John Wiseman, G8BPQ, sends along the following information about running other
applications using I2C:
The TNC-Pi can be used with applications that use the Linux ax.25 stack, or
applications that expect to see a KISS TNC on a serial port. Program
I2ckiss
converts the
I2C
protocol to a standard KISS presentation on a virtual serial (pty)
port. It is available here:
https://dl.dropboxusercontent.com/u/31910649/i2ckiss
