I am interesting to make a pc program to read some data from the serial interface of ER-420M. I found ER420 PC Utility Protocol but i have some problems of understanding.
In the Default Packet without data i don't know what it is "block count", "block index", "max". Has someone have sample program to any language to understand the communication aspects? I am an electronics student and this will be my project for microcomputer interfacing.

Thank you in advance.