HDLC protocol chips, such as sab82532, intel8274, pt7a6525 and other synchronous serial communication controller chips, are often used in the early implementation of synchronous HDLC communication between trains and locomotives.
The scheme of special communication chip has the following technical disadvantages:
● High development difficulty
● Generally, parallel bus is used to communicate with host computer, which takes up too much I / O
As these HDLC communication chips have been out of production for many years, it is not appropriate to choose HDLC protocol chips.
The new firmware of yace HDLC products adds NRZI coding support to support TCMs communication of train and locomotive.