Digitax 4GMCU, Техническое руководство

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The information contained here are property of DIGITAX Automotive Electronics Italy, and extremely confidential. Any disclosure, copying, distribution to third
party is strictly prohibited.
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Communication Protocol A.I.T.P.
Ver. 3.5
The purpose of this document is to describe the Communication Protocol COMMTAX2.
It is divided into two sections:
Basic protocol description
Implementation in Digitax product 4GMCU
The COMMTAX2 communication protocol is intended as a standard base to make communicating
two or more devices on the same line, it is designed to interface mobile modules and to interconnect
them; also with the proper extension may be used for radio/infrared link to base station.
The complete addressing of each packet allows several devices to share the same line without wrong
routing or lost of data.
IMPORTANT NOTE:
The basic protocol structure is the same one used in Digitax F1 Taximeter, so applications can use
the same transport layer protocol to communicate both with Digitax F1 and with the AITP
processor inside the 4GMCU.But there is also a simplification: only single packets messages are
used. For this reason please use a data packet size bigger than the max quantity of data that have
to be transferred, actually 96 bytes of data. Also the Device ID is different, for the Taximeter is
0001 hex, for the AITP is 1000 hex.