Computherm Q7 RF - 868 Mhz

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kofi
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Posts: 1
Joined: 08 Jan 2018, 16:13

Computherm Q7 RF - 868 Mhz

#1 Post by kofi » 09 Jan 2018, 14:37

Hi,
I have Aurel Transceiver (868,3 Mhz). My goal is to control heating with RF Link.

At home I have this wireless Thermostat operating at 868 Mhz:

https://www.amazon.co.uk/COMPUTHERM-Q7R ... B00SI1D6FY

ON Signal:
2018-01-06 21:50:53 - 20;04;DEBUG;Pulses=466;Pulses(uSec)=120,6420,510,510,540,330,90,300,90,330,90,300,120,120,300,120,300,120,300,300,120,300,90,330,90,300,90,120,300,120,300,90,300,120,300,120,300,300,90,120,300,120,300,120,300,300,90,300,90,300,90,300,90,300,90,300,90,300,90,300,120,300,90,300,90,300,90,300,90,120,300,120,300,120,300,300,120,300,90,300,90,300,90,120,300,120,300,120,300,90,300,120,300,300,120,120,300,120,300,90,300,330,90,330,90,300,90,300,90,300,90,300,90,300,90,300,120,600,510,480,570,300,90,300,90,300,90,300,90,120,300,120,300,120,300,300,120,330,90,300,90,300,90,120,300,120,300,120,300,90,300,120,300,300,120,120,300,120,300,90,300,330,90,300,90,300,90,300,90,300,90,330,90,300,90,300,120,300,90,300,90,300,90,300,90,120,300,120,300,120,300,300,120,300,90,300,90,300,120,120,300,120,300,90,300,120,300,120,300,300,120,120,300,90,300,120,300,300,90,300,90,300,90,300,90,300,90,300,90,300,90,330,90,600,510,510,540,300,90,300,90,300,90,300,120,120,300,120,300,90,300,300,120,300,90,330,90,300,90,120,300,120,300,90,300,120,300,120,300,300,90,120,300,90,300,120,300,300,90,300,90,300,90,300,90,300,90,300,90,300,90,330,120,300,90,300,90,300,90,300,90,120,300,120,300,120,300,300,120,300,90,300,90,300,90,120,300,90,300,120,300,120,300,120,300,300,120,90,300,120,300,120,300,300,90,300,90,300,90,300,90,300,90,300,90,300,90,300,120,570,540,510,540,300,90,300,90,300,90,300,90,120,300,120,300,120,300,300,120,300,90,300,90,300,120,120,300,90,300,120,300,120,300,120,300,300,120,90,300,120,300,120,300,300,90,300,90,300,90,300,90,300,90,300,90,330,90,300,120,300,90,300,90,300,90,300,120,120,300,120,300,90,300,300,90,300,90,300,90,300,120,90,300,120,300,120,300,120,300,120,300,300,120,120,300,90,300,120,300,330,90,300,90,300,90,300,90,300,90,330,90,300,90,300,120,6990;

My understanding is that these are 4 signals with preamble - 4times 500+ Pulse

When analyzing signal using Manchester encoding, where 300= HIGH, 90/120 = LOW:
Transition from high to low = 1, from low to high = 0:
330,90=1,300,90=1,330,90=1,300,120=1,120,300=0,120,300=0,120,300=0,300,120=1, etc.. I get to:

11110001 11100000 10001111 11111111 00011110 00001000 11111111
___F1___ ___E0___ ___8F___ ___FF___ ___1E___ ____8___ ___FF___

When debbuging I see that byte 3 is On (8F) and OFF (80h).. I guess the byte1 would be device ID and Byte 7 perhaps checksum??

Can someone help with codding plugging to RF Link?

I wrote email to frankzirrone yesterday, so perhaps he will have a look - but anyway I wanted to share these steps for others in case you'd want to troubleshoot and decompose RF signals yourself.

Martin

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