1785-L20B

1785-L20B

1785-L20B

我们可以看看HUB4CAN的真本事，该机拥有波仕CAN零延时自动切换核心技术、内含1个上位机CAN接口芯片、和4个下位机CAN接口芯片、每路都有600W抗雷击浪涌保护，上下位机之间具备2500V的光电隔离系统。HUB4CAN可以作为CAN 光隔1拖4口HUB，可用于增加CAN信号的总驱动能力（带负载能力增加4 倍），或用于CAN 组成星形网。

波仕CAN零延时自动切换技术比所谓的“流控”强多了。 所谓“流控”就是用通信数据流来启动收发切换，由于必须用数据流来启动切换，所以通信的第一个字节就作为流控开关信号浪费了，因此“流控”是有延时的，延时为1个字节，500Kbps时大约200us，与速率成反比。传统的“流控”CAN HUB由于存在延时，因此不仅不能增加CAN的通信距离，相反由于延时的加入使得CAN通信距离减少一个等效延时的导线长度，该距离的减少在高速通信时尤为明显。传统的有延时的CAN HUB不能够级联，因为这样会累积延时导致无法正常通信。

波仕HUB4CAN独到的零延时自动收发转换技术可以用简单方法直接进行检测：首先在两端加电源，然后在上位机端或者下位机端的任意一端的+A（即CAN-H）与—B（CAN-L）之间加2.5V左右电压（1.5 到3V均可），当+A接正极、—B接负极时则HUB4CAN的另外一端的+A与—B之间为正2.5V电压，反之，撤掉2.5V电压（实际为0V）后隔离的另外一端的电压也为0V（高阻状态）。传统的有延时的CAN HUB产品是通不过这样的简单检测的。

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