阐述了rs-485总线规范，描述了影响rs-485总线通信速率和通信可靠性的三个因素，同时提出了相应的解决方法并讨论了总线负载能力和传输距离之间的具体关系。

485通讯的简介，有需要网络通讯知识的可以了解一下

Eu/Tb codoped aluminoborosilicate glasses were fabricated by high temperature melting-quenched technique and their luminescence properties were investigated by excitation and emission spectra. Under 376 nm excitation, blue, green and red emission

The basic knowledge of serial communication concept (232, 422, 485). PDF