A method for updating a tap coefficient of a decision feedback equalizer is provided. More specifically, the dominant communication device is capable of limiting the function of the subservient communication device when the user of the subservient communication device does not respond to an attempted communication from the dominant communication device. The notification system detects additions to the user’s folders and when a new message arrives, the notification system sends an alert to a Wireless Access Protocol enabled device configured for the user. The delay circuit includes an inverter array having a plurality of stages each containing an inverter. When the upper and lower covers are assembled to the upper and lower sides of the intermediate frame, the latch hooks of the upper hooking members are abutted on lower edges of the latch legs of the lower hooking members to firmly hold the lower cover to the upper cover in three directions. In order to improve the production process and the textile material, said control device is provided with control means for adjusting the feeding length of the weft thread that is to be delivered according to the traveling distance of the weft bar, which is predefined by the pattern program.