A handy terminal allowing an object of interest such as a cargo to be efficiently searched utilizing an RFID tag is provided. The array of logic elements is configured to transmit the second data transmission according to information received in the first data transmission. The server is configured for detecting any backlogged synchronous flow, and when the server visits any said backlogged synchronous flow, it allows the backlogged synchronous flow to utilize the resource for a given time, whereby the synchronous flows have a guaranteed transmission window on each round. Such a spool gun is quickly and efficiently connectable to the gas and power systems required for performing welding processes. The source region is disposed in the substrate at the bottom of the trench.