內嵌式控制系統 (embedded control system) 的意涵是被內嵌 (embedded) 在另外一個更大的系統中、用來執行特定的控制功能。在分散式控制的應用上，我們會希望嵌入式控制系統能具有通訊能力，以達到在使用者操作端中央監視，以及在實際受控體端的遠端控制的目的。本論文研究如何賦予一般內嵌式控制器通訊能力的技術，其包括：(1)設計使用者介面和控制機制分開的兩個模組已符合通訊應用的背景，(2)基於應用定義符合的功能，(3)利用軟體實現設計好的通訊驅動裝置因而減少了所需的硬體花費。本論文並以樓宇空調應用裏的 FCU控制器為例，說明如何針對原單機型的FCU控制器，附加Modbus的通訊能力。藉由我們所提出使用者介面面版與嵌入式控制核心分離的架構，本論文所提出具備通訊能力的恆溫控制器，藉由Modbus網路，可以僅用一個裝置於牆上的人機介面模組，而最多控制到256個裝置在天花板上的風扇線圈控制器模組。

An embedded control system (ECS) provides a specific control function to a larger system where the ECS is embedded. In distributed control applications, it is often desired to enable an ECS with communication capability for the purpose of central monitoring at the user operational side and remote control at the physical controlled plant side. This paper addresses the communication enabling technique for a Modbus-enabled fan coil unit controller geared to the HVAC systems in medium to large air conditioning spaces. Communication enabling technique studied here includes: (1) design of two separate modules of user interface and control mechanism to suit communication application context, (2) definition of communication compliant functions based on application syntax, and (3) implementation of designated communication drivers through software, thus reducing the otherwise required hardware cost. With a proposed architecture that separates user interface panel from the embedded control core, the Modbus-enabled fan coil unit controller makes it possible to control up to 256 ceiling mounted fan coil controller modules through Modbus network by just one wall mounted user interface module

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