但你需要提供底层接口，如字节发送，重置设备，延误等等。

But you need to provide low-level interface to it - such as byte send, reset device, delays etc.

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利用二者模型的底层接口，搭建了液固耦合的轴向柱塞泵虚拟样机模型。

Solid-liquid coupling virtual prototype of axial piston pump was put up based on the interface of the two models.

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基于OPC标准的EPA数据服务器选择OPC标准作为上层接口，选择EPA规范作为底层接口。

OPC Standard is selected as upper layer interface in contrast with EPA Specification as bottom layer interface in EPA Data Server based on OPC.

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