From Newsgroup: alt.ham-radio.packet
A reset pulse is sent to the CPU (68HC11) in the PK12, performing a
'soft' reset everytime you power cycle it, soft meaning the variables in
RAM are not overwritten. So if the settings are garbage, the hardware
reset doesn't do much for you.
You can temporarily disconnect the internal lithium battery (remove JP1
or unsolder the batt. connector) to zap the RAM memory so that it starts
up with the factory defaults settings.
Another way is to turn on the PK12 with a PC link to the RS-232 input
(running a terminal program) and type an asterisk -- this turns an
autobaud mode where you will probably see some response back from the
PK12. Then enter the word RESET, and you should see a sign-on message
via the serial line, and all settings will then be defaults.
The RS232 connector on the PK12 can connect directly pin-pin with a 25
pin serial PC connector using only 3 pins (2-2, 3-3, 7-7). If your PC
has a 9 pin connector, wire 2-3, 3-2, and the ground wire 7(PK12)-5(PC).
BobR wrote:
Need schematic or manual for PK12 TNC. At the very least I need to know how to do a hard reset. Thanks, BobR
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