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You can only change the i2c address via setparams for the original
TNC-Pi. With the Teensy code you have to edit TeensyConfigPacket.h
to switch between serial and i2c or to change i2c address (but you
shouldn't need to to that).
Check your TeensyConfigPacket.h setting to confirm host port and
The Teensy code will respond to i2c config requests even when set to
use the serial port to the pi.
On 11/06/2020 03:10, N5XMT wrote:
Went back to 6, and changing the i2c address shows
as changed in getparams, but the address never changes. Setting
it to 0 for serial does nothing but change the value returned
with getparams. Even after a reboot it never responds to serial
and only responds to i2c address 0x1e (30)
On Jun 10, 2020, at 10:16, John Wiseman
Software Version 6 is pretty old. The current is 11 and will
initialise all parameters on first run.
The Default values are TXDelay 25 Persist 64 slottime 10 (100
ms) TxTail 1 Our Chan 0 RX Level 0 Center Freq 170
TX level should be set to suit your radio. 25 will give about
300 mV peak to peak output.
The latest software can be downloaded from
On 10/06/2020 17:10, N5XMT
Yep, have that.
still a couple not mentioned that I need as well,
since all of them are maxxed at 255...
Here is what is set in mine (changed baud from 2550
to 1200 already) The ones here marked with
<<<<< are the ones never mentioned, and
also the difference between RX Level (config) and RX
Does someone possibly have one up and running that
can send me what they have their params set to?
# ./pitnc_getparams 1 30
pitnc_getparams Version 0.0.0.5
TNC Software Version 6
01 TXDelay - Zero means use ADC 255
02 Persistance 255
03 Slottime (in 10 mS) 255
04 TXTail 255
05 Full Duplex - Not used 255
06 Our Channel (Hex) ff
07 I2C Address (0 = async) Hex 1e
08 Mode Speed 1200
09 RX Level (Config) 255
10 TX Level 255
11 RX Level (Actual) 255
13 Centre Freq 2550
8 6 ff ff ff ff ff ff 1e c ff ff ff ff 1c c0 sum 0
Here is a link to
their manual. Look at page 11 - 13.
I will update ours with the bits that are missing from