I wouldnt assume Multi-Master Capability.

I'm a bit confused, that this Car Equipment features an I2C Bus, 
though.

Danish B. wrote:
> I wouldnt assume Multi-Master Capability.
>
> I'm a bit confused, that this Car Equipment features an I2C Bus,
> though.

Hi Danish,

I assume thats a I2C bus because this radio CDR2005 communicates to an 
MID (board computer) and when I did a Web search I found many kinds of 
sending data to that MID using this modified I2C (SDA, SCL, MRQ). So I 
assumed that's a I2C modified type...

See the code below of the communication to send data from an Arduino to 
an MID (I also attached the original code .ino, .cpp, .h to this post):

***********************************************************

#include "TID12_10.h"

TID MyTid(7,5,6); //D5->SCL, D6->MRQ, D7->SDA


void setup() {
MyTid.space1_init(0,0); //(first position,last position) (i. e. just the 
first digit)
MyTid.space2_init(1,9); //use digit 2 to 10
MyTid.clear_space(1);
MyTid.clear_space(2);
}

void loop() {
char first[2];
first[0] = 64; //define a symbol, here @, for more symbols see attached 
picture, thanks to Georg (Gorgeous188)
first[1] = ' '; // space for blinking
first[2] = '\0'; // null character termination

MyTid.display_message(first,1,1); // (speed,position)
MyTid.display_message("This is a test...",4,2);
}

***********************************************************

Do You have any idea of how can I receive data from this type of 
communication (SDA, SCL, MRQ)? This radio only send data using this type 
of comm and I need to read this data using an Arduino.

I already linked this radio using an Arduino UNO R3 but the Arduino 
shows nothing connected to the I2C bus when I perform an address scan.

Thanks again!