zxing barcode scanner c# General Port Issues in Software

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No matter what type of port you use, if it s not working, you should always check out a few issues First of all, make sure you can tell a port problem
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14: Input/Output
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from a device problem Your best bet here is to try a second known good device in the same port and see if that device works If it does not, you can A known good device is assume the port is the problem It s not a bad idea to reverse this and plug simply a device that you know is in good working order All techs the device into a known good port count heavily on the use of If you re pretty sure the port s not working, you can check three things: known good devices to check First, make sure the port is turned on Almost any I/O port on a motherother devices For example, if board can be turned off in CMOS Reboot the system and find the device and you think a PC has a bad keysee if the port s been turned off Windows Device Manager also enables you board, borrow one from the PC next door and see if that keyto disable most ports Figure 1417 shows a disabled parallel port in Device board works on the broken Manager you ll see a red X over the device icon To turn the port back on, machine right-click the device s icon and choose Enable The fact that you can turn off a port in Device Manager points to another not-so-obvious fact: ports need drivers just as devices need drivers Windows has excellent built-in drivers for all common ports, so if you fail to see a port in Device Manager (and you know the port is turned on in CMOS), you can bet there s a physical problem with the port itself Because ports have connectors inserted and removed from them repeatedly, eventually they can physically break Figure 1418 shows the back of a USB port that s been pushed on too hard for too long and has physically separated from the motherboard Unless you re an expert solderer, you either must stop using those ports or replace the entire motherboard Many ports (or the plugs that fit into those ports) use tiny pins or relatively delicate metal casings that are susceptible to damage PS/2 plugs are some of the worst for bent pins or misshaped casings Figure 1419 shows what happened to a PS/2 plug when I was in a hurry and thought that force was an alternative to lining up the plug properly Replacement plugs are available but again, unless you re excellent at soldering, they re not a viable alternative Still, if you re patient, you might be able to save the plug Using needle-nose pliers Figure 1417 An X marks a disabled parallel and a pair of scissors, I was able to reshape the plug so that it once again port in Device Manager fit in the PS/2 port
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Figure 1418
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Broken USB port
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Figure 1419
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Badly bent PS/2 plug
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Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
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Common I/O Devices
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So what is a common I/O device I m hoping you immediately thought of the mouse and the keyboard, two of the most basic, necessary, and abused I/O devices on a computer Another fairly common input device that s been around a long time is the scanner To these oldsters, you can add relative newcomers to the world of common devices: digital cameras and Web cameras
If you want to get picky, these five common I/O devices enable a user only to input data; they don t provide any output at all
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