Technical Manual

East Wind Technologies, Inc.

3 Application-layer Protocol

3.1 Overview

This chapter will introduce the communication protocol application level commands and data

structures in detail, the application level protocol only introduce the commands and the data.

We illustrate each command in the following format:

Frame

Command

Data

Checksum

Frame Header: 1 byte length information, all the bytes except Checksum byte.

Checksum: Exclusive OR (XOR) results from length byte to the last byte of data.

For example, we explain separately with the following command.

Frame

0x11

Mode

Checksum

It’s the command to control the module working status, now we need to close the antenna with

this command, so,”mode” is 0x00, so, the command is:

0x03 11 00 12; in it 0x03 is Frame Header, all the bytes except Checksum byte, the length is 0x03,

so take the value 0x03; 0x11 is the command; 0x00 is parameter (meaning close automatical detecting

card, close the antenna); 0x12 is Checksum byte, the front 3 bytes XOR result is 0x12.