NX-320 Multi channel PTT

[riodda]

Hi to everybody, i'm a bit a newbie so i hope you will forgive me for propably silly questions.
I use Kenwood NX-320 for Motorsport purposes and we have a couple of hedphones that conncets to the NX-320 trough the 2 jack connctors, those hadphones have 3 different buttons, if i press button one i transmit Zone 1 Channel 1, with button 2 i trasmit Zone 1 Channel 2 and with button 2 i trasmit zone 1 Channel 3.
I think that the headphone cirquits has like a serial stream that tells the handheld radio what to do and i would like to know if this serial commands are some how documented becouse i wish to make a new headphones on my own based to the same principle.
I know that the company that builds the headphones buys the cirquit from somebody, for me would be ok alse buy the cirquits and then integrate them in my design.
Thanks, and best Regards.

 

[riodda]

Sorry i did a little mistake in my text, when i press button 3 i trasmint zone 1 channel 3 not channel 2 as i wrote.
This kind of headphones is pretty common in motorsports but i would love to figure out what is the criquitery that makes this possible.
Thanks.

 

[flux4201]

Hmm, what brand and model headset are you using? Generally Kenwood does not give out there serial protocol documentation, normally only to manufactures of accessories such as that headset manufacture.

 

[mmckenna]

The NX-220/NX-320 can be controlled by the 2.5mm/3.5mm speaker mic connector, but it uses what Kenwood refers to as a "PC type command", not a switch closure that you could recreate easily. Even if you could recreate it, it's not going to be a simple task.

If you were using the NX-300 or NX-310, it has a different type of connector on the side and it gives you some more functions.

Posting a model/brand for your headset might help.

Other option is to program the radios keys (if you have the keypad model) to go to the channels you want.

 

[riodda]

Hmm, what brand and model headset are you using? Generally Kenwood does not give out there serial protocol documentation, normally only to manufactures of accessories such as that headset manufacture.

Headset is custom Build for Motorposrt Purposes from a small italian reseller called D'Alessio, but MRTC in uk has the same option.

 

[riodda]

The NX-220/NX-320 can be controlled by the 2.5mm/3.5mm speaker mic connector, but it uses what Kenwood refers to as a "PC type command", not a switch closure that you could recreate easily. Even if you could recreate it, it's not going to be a simple task.

If you were using the NX-300 or NX-310, it has a different type of connector on the side and it gives you some more functions.

Posting a model/brand for your headset might help.

Other option is to program the radios keys (if you have the keypad model) to go to the channels you want.

I was supposing a serial kind of communication rather than a simple switch, unfortunately i can't use side buttons or the keypad since on the first case the radio are in the back of the operator and therefore side switch are hard to reach and identify, the Radio Model il NX-320E3 and has no keypad.
I've found no traces one the net of "PC type command" for any NX radio, just for sat radios like TS-XXXX.
If somebody has this reference i would really love to have it !

Thanks.

 

[mmckenna]

All I've been able to find on the protocol is this:

Protocol type Version 1:
This command starts with STX (Start of
Text) and ends with ETX (End of Text). This
command is compatible with transceivers
that support the KENWOOD PC Interface
Protocol.

Version 2:
The command sequence is almost the same
as the Version 1 data format, but it has the
command sequence of Version 1 and a
sequence number (SEQ).

 

[riodda]

All I've been able to find on the protocol is this:

Protocol type Version 1:
This command starts with STX (Start of
Text) and ends with ETX (End of Text). This
command is compatible with transceivers
that support the KENWOOD PC Interface
Protocol.

Version 2:
The command sequence is almost the same
as the Version 1 data format, but it has the
command sequence of Version 1 and a
sequence number (SEQ).

Yep, this is the same i've found on the help of the KPG software.
I hope somebody can have a kind of reference manual of the PC commands, since i think ar common on most of the kenwoods.