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Showing posts from November 7, 2010
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Test Power Supply Background information on the power supply The power supply’s purpose is to convert the 115-volt alternating current (AC) supplied by an electrical outlet into direct current that the PC can use. Typically, the power supply converts the AC into a 12-volt, 5-volt, or 3.3-volt direct current. The 12-volt direct current is used to power devices with motors, such as hard drives and CD-ROM drives. The 5-volt and 3.3-volt outputs are used to power various electronics on the system board. Almost every PC power supply in use today is either an AT or an ATX power supply. The main difference between the two is the number of connectors attached to the wires. But regardless of which type of power supply you're working with, there are some basic components that apply to all power supplies. The first is the power connection, which is where the power supply connects to the electrical outlet. Next is the motherboard power, which is delivered via a set of cables running from the p
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How To do A serial loopback test?? A loopback test allows you to send and receive data from the same serial port to verify that the port is operational. To perform this test, you need to temporarily connect the proper pins to allow signals to be sent and received on the same port. Table of Contents Loopback Test Connectors Performing a Loopback Test in Hyperterminal Performing a Loopback test in Measurement & Automation Explorer Performing a Loopback test in LabVIEW Loopback Test A loopback test can be used to troubleshoot serial communications. It can show problems in the serial port, the cable, or the software generating the messages without having to connect to third party hardware. By connecting the proper wires, a loopback test can verify the operation of serial communication. Loopback tests can be used for RS-232 , RS-422 , and RS-485 serial communication. For more information on RS-232, RS-422, and RS-485 see the Serial Communication Overview . Note that not all serial