This program was designed as a utility tool to allow the user to send and recieve data from a serial com port while monitory the byte data. If a loopback ciruit is made on the com port(jumper send to recieve DB9 pins 2 & 3) a developer can also monit

VB倒置字符串并每两个字符（一个字节）间加空格显示-VB inverted string and the space between two characters (one byte) shows

本代码为在VB6.0环境下所写的CRC_16字节型算法，可用于上位机与下位机串口通信使用。-This code in VB6.0 environment CRC_16 written byte-type algorithm, can be used for PC and next-bit machine using serial communication.

附带VB和Delphi的例子 西门子ppi协议，支持V区操作，实际应用中足够了， 支持V区的位、字节，字和双字操作， 默认一次可以读取100个字节。 控件默认参数为串口1，PLC地址2，Even效验，波特率9600 使用控件时，一般只需更改2个属性： 1、PLC地址　plcAddress 2、串口号　 port-VB and Delphi examples with Siemens ppi agreement, supporting the V zone operat

这是自己做串口通信时的例子， 经过验证的，并且是byte传送的， 很好的例子。(This is their own example of serial communication, after verification, and is byte transmission, a good example.)