i found out, that the pic24 communicates with maybe the cpu over uart.
Some more information you find here and also the pinout i found out.
Pin1
Pin2 - D7 LED(green) see (*1)
Pin3
Pin4
Pin5
Pin6 - GND
Pin7 - VDDCORE
Pin8
Pin9
Pin10
Pin11
Pin12
Pin13
Pin14
Pin15 - paaring switch see (*1)
Pin16 - GND
Pin17 - VCC
Pin18 - !MCLR available on J3
Pin19 - PGD available on J3
Pin20 - PFC available on J3
Pin21
Pin22
Pin23
Pin24 - UART (setting 9600 baud)
Pin25
Pin26
Pin27
Pin28 - VDD
Pin29 - GND
Pin30
Pin31 - OSCO (8 MHz)
Pin32 - OSCI (8 MHz)
Pin33
Pin34
Pin35
Pin36
Pin37 - IR-leds see (*1)
Pin38 - D8 LED(green) see (*1)
Pin39 - GND
Pin40 - VDD
Pin41 - IR-reciever see (*1)
Pin42
Pin43
Pin44 -
(*1) look at post http://forum.gtvhacker.com/revue/topic132.html
When sniffing Pin24, you get an output like this:
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....3.0..3.0.0.0031.22.0.:..):..).
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EB D2 D2 00 33 2E 30 2E 0F 33 2E 30 2E 30 2E 30
30 33 31 2E 32 32 00 30
30 3A 9D 10 29 3A 9D 10 29 FA FA FA FA D2 D2 D2 D2 D2 D2 D2 D2 D2 D2 D2 D2
This is the output
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0F 33 2E 30 2E 30 2E 30
30 33 31 2E 32 32 00 30