因應自動化科技的蓬勃發展，許多機械設備越來越要求定位精度，尤其是精密機械與電子半導體等產業中，其生產線的機械控制定位精度更是要求，因此常會安裝位置量測系統或位置計數器等，並配合伺服馬達的控制，藉以達到精度更高的定位控制。隨著量測系統設備模組化的同時也將體積越做越小，且往往採用七段顯示模組做為顯示數據之用，無法提供操作者其他的文字訊息。因此本論文以此方向為研究目標，藉由SIKO公司的絕對位置計數器AP04當作研究參考樣本，規劃並設計電路以建立計數模組之計數、通訊、顯示的功能。計數模組的運算處理核心採用德州儀器製造的微處理器MSP430F2619，並使用文字型液晶顯示模組以建立位置計數與訊息顯示之功能。通訊介面則採用RS232與RS485的連接端口，並配合SIKONET5的通訊協定以建立指令數據傳送與接收之功能。

Because of the automation technology flourishing, many mechanical devices are increasingly focused on the position accuracy, especially in precision machinery and semiconductor industries, the accuracy of position is more important in mechanical control of production line, so the position measuring system or position indicator are often mounted, and it usually accompanies servomotor control in production line in order to achieve higher precision in positioning control. With the modularize of measurement system equipment, it is getting smaller size and often used the seven-segment display module to show the data or position value, so it cannot provide other message for user. Therefore, it is the research objectives in this study, with product of SIKO, absolute position indicator AP04, as reference samples in this research, planning and design the circuit to establish functions of count, communication and display in position indicator module. The arithmetic processing in position indicator module is using MSP430F2619 microprocessor which is produced by Texas Instruments, and use alphanumeric liquid crystal display module to display messages or values so that establish functions of position indication and showing information for user. Communication interface is via RS232 and RS485 connection ports with SIKONET5 protocol to transmit command and receive reply data.

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