发表于:2002-04-08 17:17:00
10楼
我认为Echelon推广shortstack方案的目的并不是解决“很多不能解决问题(包括实时问题)”,我们是否可以认为shortstack仍然是MIP一个应用,或者说是一个“傻瓜型”的MIP应用?在“ShortStack™ User’s Guide”中的有一段文字:
A LONWORKS device consists of up to four components:
1. An application processor that executes layer 7, the device’s application, of the 7-layer ANSI/EIA 709.1 LonTalk® protocol, or layers 6 and 7
2. A protocol processor that implements the first 5, 6, or 7 layers of the 7-layer LonTalk protocol
3. A transceiver to provide the physical interface with the LONWORKS communications media, implementing layer 1 of the LonTalk protocol
4. Circuitry to implement the device I/O
These components may be combined. For example, Echelon’s Smart Transceiver product combines the first three components in a single chip. The chip executes the device’s application, implements the LonTalk protocol, and interfaces with the physical communications media through a transformer.
The ShortStack Micro Server allows you to use any microcontroller or microprocessor for your device’s application and I/O. The ShortStack Micro Server implements the LonTalk protocol and provides the physical interface with the LONWORKS communications channel. The ShortStack Micro Server makes it easy to add LONWORKS networks to any existing smart product.
这段话是暗示我们:用ShortStack Micro Server 可以使我们开发
微控制器或微处理器与NETWORK的接口更加容易。LONWORKS它的本质还是没变:WHEN还是WHEN,P-CSMA还是P-CSMA。