.我们经营方式灵活，经营手法多样，客户的要求我们会尽量满足。我们能够在香港、新加坡、马来西亚等地看货提货，为外资企业提供了足够的便利。我们的收购范围包括：手机、家电、通讯、电脑、设备、等上的所有电子元件，济南收购手机屏上门收购 IC，二、三极管、大小功率管、场效应管、可控硅、三端稳压、整流桥、光耦、继电器、变压器，钽电容、电感、磁珠、电容等！高价回收以下型号：
U1S2252-788-00C
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U2100
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RS-23RS-422与RS-485的性能参数表：单工、半双工和全双工的定义如果在通信过程的任意时刻，信息只能由一方A传到另一方B，则称为单工。如果在任意时刻，信息既可由A传到B，又能由B传A，但只能由一个方向上的传输存在，称为半双工传输。如果在任意时刻，线路上存在A到B和B到A的双向信号传输，则称为全双工。RS-232的一些注意事项RS-232常用的三根针是5。其中5是地线，2和3是用来传数据的。