vb 开发的串口通信测试程序，用Mscomm控件实现串口通信，自动识别接收帧长度-vb serial communications test program developed by Mscomm realize serial communication control, automatic identification to receive the frame length

VB串口收、发程序 包括通信协议 帧格式组织等-VB serial sending and receiving procedures, including communication protocol frame format organization

协议通信测试，vb，间隔1秒交替发随机数，帧长16-The protocol communications test, vb, one second intervals by alternating random number, frame length 16