中西文终端辅口与常用外设的连接

中西文终端辅口（COM2）与外部设备连接，运用面广泛，涉及问题也较多。特别是不同型号之间的设备连接，经常会遇到不能正常使用的现象，要解决好这个问题，可以归结为两个方面；首先，要分析和完善终端、外部设备的端口信号的基本定义，两个端口之间的对应引脚信号的硬件连接，其次，要熟悉和掌握所使用的中西文终端对辅口操作的控制命令序列，并将此灵活的运用在设计的程序中。最终实现对终端辅口和外部设备的控制与操作。

The Connection of Terminal's Auxiliary-port and External Equipment

If Chinese-foreign terminal auxiliary port(COM2) is connectal with external equipment,it can be used widely.But it is also involved in many problems,especially when aifferent model equipments are connected with,they couldn't be in good use.In order to fix up these questions,two directions can be come under.The first,we should analyze and improve the primary definition of terminal and eXternal equipment's port sign,and hardware connection of corresponding pin sign between two connekions,the second.we must ie well up in and grasp control command sequence that terminal in use manipulate auxiliary port,and we must flexibly use the control command sequence in designed programs.At last we can achieve to control and operate terminal auxiliary port and external equipment.