Hi Gil:
The reason why i want to change the data on the encoder input is because i need to control speed (8 bits), direction (4 bits) and the position of the camera (8 bits for one axis and 8 bits for the other axis) that will be mounted on the car. So my plan is to transmit all the data through the HT12 E, with the first 4 bits to tell what is the following 8 bits of information about (speed, direction or camera) so my information packages will consist of 12 bits and the HT12E encodes 4 information bits. What i don't understand from the HT12E datasheet is how often should I change the input to concatenate the information package of 12 bits divided on three parts of 4 bits.
I hope I'd explained my self better this time, if I didn't, just tell me.

Thank you