OBi110 and Intercom
ianst:
Hi all,
I've made some progress with my intercom connectivity through the Obi but just need a bit of help understanding if what I want to do can be achieved!
The intercom handset I have has three connections into it (plus lock release)
2 of the connections are for 2 way audio and are 'always on'. You can always lift the handset and 'hear' the intercom at the other end.
When the intercom button is pressed, a modulated electronic tone of 12Vpp-0.25A is sent across the third cable which sounds out through the handset earpiece whilst the button is being pressed.
I've successfully connected the 2 audio connections into the LINE port of the OBI which shows as on-hook and about 14v TipRingVoltage. I've left the third connection directly between the intercom and handset so pressing the buzzer 'rings' the handset.
Trouble is - I stumped now what to do next!
There's no 'ring' facility through the Obi since the audio is always on and the 'buzzer' cable goes around it - what I want to do is have the intercom button ring a SIP phone and get the Obi to connect to it.
Can anyone help??
Cheers
Ian
ianst:
Slight update:
Had the LINE wires the wrong way round. :(
Swapped the wires over and the TipRingVoltage is now registering -13v with a solid green LINE LED.
Still stumped where to go next.... :-[
Cheers
Ian
Shale:
1. The "intercom handset" is at the far end, and you have wired that to the Line jack? That sounds strange. I would have thought that the intercom would be like a phone, but I presume you are implying that the intercom supplies its own battery current. Maybe you have a block diagram of your plan? I had thought of searching through your prior posts, but I thought it would be better if you provided the description.
Are you planning to make the Phone port unused?
2. This is the first that I had read about the polarity of the Line coming in to the OBi110 to be important.
ianst:
Hi Shale,
Thanks for replying so quickly - I'll try and explain it a bit better! :-[
This is an intercom system between a gate and the house which also has a remote gate unlock facility.
At the moment it's all temporarily rigged up in my home office (!) but when properly installed there will be a door station with keypad (buzzer button and microphone/speaker) by the gate. This is connected to a 240v transformer by the gate which supplies power to the door station/pin pad and onwards to the handset.
The handset will be in the house and is a simple device with a single button to activate the remote gate locks.
My plan was:
Door station by gates has CAT5e up the house which would normally be directly connected to the intercom handset.
I 'insert' the Obi110 between the door station and handset (door station on the LINE, handset on the PHONE) so that when someone presses the buzzer on the door station, the original handset on the PHONE port rings as well as various SIP devices (SIP handsets in the house plus SIP clients on iPhones etc).
I've got the LINE side and PHONE side connected, but struggling to get my head around the dialing side of it given the fact that the 'ringing' part is a third cable between the door station and handset and the audio channel is always open.
Diagram of the kit in the link:
http://avaccesscontrol.co.uk/datasheets/PRS240.pdf
Cheers
Ian
QBZappy:
Google the following: (copy and paste the entire line)
site:http://www.obitalk.com/forum/ intercom
Lots of references here to what you are trying to accomplish. Maybe you can find a solution in one of these posts.
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