下面是摘录自《在 MAS21 的基础上,怎样建立 STEP 7 Micro/WIN 与 MD720-3 之间的通信连接从而实现与 S7-200 的远程通信》里的一些内容，从摘录的内容看，用MD720-3可以实现远程编程功能，但具体怎样操作，请各位大侠指教。


Teleservice mit MD 720-3
1 General information about the teleservice
1.1 What does the teleservice facilitate?
The teleservice function in STEP 7-Micro/WIN offers the user the
opportunity of accessing an S7-200 controller via a telephone network. This means that there is a telephone connection between a remote S7-200 controller and a local PC/PG with STEP 7-Micro/WIN.


This teleservice function guarantees complete access to the S
controller.
* Downloading/uploading the user program
* Access to the status table
* Displaying the status information for the S7-200 controller
* Accessing the memory module of the S7-200 controller

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