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This paper aims at the establishment of a monitor system by use of the personal digital assistant (PDA). The system is accomplished with a PDA, a wireless device server, a programmable logic controller (PLC), driver, and servomotor, etc. A complete system includes a control module, a wireless network module, and a controlled module. The control module is accomplished with a PDA with the advantage that adequate display space shows intact functions on a light and small controller. The network module includes the wireless network card of the PDA, the wireless device server, and the RS-232 port of the PLC. This apparatus will reach the aim of wireless communication. The controlled module consists of a PLC, a driver, and a servomotor, and the motor can be controlled via analogic and digital commands. The man-machine interface is achieved with eMbeddeb Visual Basic 3.0 (eVB). This program can save development time and realize the aim of graph control. From this system, the remote controller can use a PDA to monitor the apparatus. This system provides an economic and convenient solution for the automatic control system.