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Old 21st Aug 2021, 11:56 pm   #1
JohnBHanson
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Default Using the Door Opener interface on a panasonic KX-T308 telephone exchange

The Panasonic KX-T308 telephone has an RJ11 socket for connecting a door opener.

Using the standard colour codes for an RJ11 lead this gives....

Door opener interface

Black + 12 Volts
Red - Door 1
Green - Door 2
Yellow - GND

Door 1,2 0 volts door locked, 5 volts for door unlock

Easiest way is to use a drive transistor with base resitor to the signal driving a
relay which must have a protection diode.

Dialing the codes 551 or 552 result in a unlock (5 Volts) for 5 seconds.

Note this has to be enabled first under programming to be enabled for each phone.

these codes could be entered from any pulse/tone telephone or even a computer via a modem.

Of course this could be used to control any external equipment. Ideas as
to what would be intersting.
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Old 22nd Aug 2021, 10:03 am   #2
OscarFoxtrot
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Default Re: Using the Door Opener interface on a panasonic KX-T308 telephone exchange

I think it would be very civilised being able to phone from the bedroom and initiate the kettle for early morning tea.

Or step up/down through the channels on a radio feeding a pantry transmitter.
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Old 22nd Aug 2021, 1:13 pm   #3
merlinmaxwell
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Default Re: Using the Door Opener interface on a panasonic KX-T308 telephone exchange

A cat food deliverer, that would save our feet being clawed and chewed during a weekend lie-in. Well my feet anyway, I am tall enough for them to stick out of the end of the bed, that wouldn't stop the "while you are feeding the cats a cuppa would be nice".

Solved, ring the butlers bell!
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Old 22nd Aug 2021, 1:51 pm   #4
rambo1152
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Default Re: Using the Door Opener interface on a panasonic KX-T308 telephone exchange

I used to maintain those KXT 308 systems I probably wired some door openers.

My Raspberry Pi Asterisk PABX has 10 relays connected to the GPIO pins using one of these cheap Chinese boards.

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A further two pins can be used for doorbells or alarm inputs

It was an interesting exercise when I did it in 2017 but although the code is still in place on my system I have not found a use for it other than its own novelty.
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Old 5th Sep 2021, 6:59 pm   #5
whyperion
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Default Re: Using the Door Opener interface on a panasonic KX-T308 telephone exchange

Seeing the Lookmumnocomputer You Tube video channel , controlling the on off of a teletubbie toy seems one use.
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Old 12th Sep 2021, 10:35 pm   #6
Oldcodger
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Default Re: Using the Door Opener interface on a panasonic KX-T308 telephone exchange

Quote:
Originally Posted by rambo1152 View Post
I used to maintain those KXT 308 systems I probably wired some door openers.

My Raspberry Pi Asterisk PABX has 10 relays connected to the GPIO pins using one of these cheap Chinese boards.

Attachment 239839

A further two pins can be used for doorbells or alarm inputs

It was an interesting exercise when I did it in 2017 but although the code is still in place on my system I have not found a use for it other than its own novelty.
likewise, rambo. I'must have fitted hundreds of 308/616/1232 and other types of Panasonics using the doorinterface and never had a problem( not with the electrics). Woodworking, we left to carpenters. our PSU of choice was a bell transformer. I can't remember what Panasonic suggested on the 308 course. What we did spot in Panasonic HQ was a box con 201 with no lid.
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