What is a Serial to USB adapter?
A serial to USB adapter is an adapter that allows a user to use legacy serial devices on newer PC's, or simply put, it allows a serial device to be connected to a USB computer. This device can come in various configurations, from a simple cable with a 9-pin connector on one end and a USB plug on the other end, to a hub that allows multiple serial devices to be attached.
What can I use the adapter for?
There are many older (and some newer) serial devices that are still useful.
Some personal examples are:
- Serial communication cable,
- Older data collection hardware,
- Older Point of Sale (POS) applications,
- Or, you may have an older printer or fax modem. that could still be useful.
The list can go on, but you can see that this handy little device can be indispensable!
What to look for in an adapter.
Although the serial to USB adapter is usually a simple device there are some technical specifications to consider:
Connector Types:
USB Connector - This should always be "USB A Female". I've never seen anything else, but check to make sure as standards can change.
Serial connector - This is usually described as either DB-9 Male, DB-9 Female, RS-232 Male or RS-232 Female. Just confirm that the polarity (Male/Female) is correct for your needs. If you do get the wrong gender, you'll need to get a gender changer (usually about the cost of a generic cup of coffee).
Number of connectors (sometimes called number of ports) - In the case of a hub, the serial end will have more than one connector, confirm that there are enough connections for all your devices.
Data Transfer Rate:
Look for 230 Kb/s or better - This appears to be the standard. It is slower than standard USB but faster than most serial communications needs.
Physical size:
Always check the physical size to make sure it will fit in an out-of-the-way location. Also make sure the cable length is long enough for your needs.
Power:
Most non-hub and some hub adapters do not require external power as they draw power directly from your computer. However some do and some offer it as an option. If you are using a hub and it will have a few serial devices plugged in, you probably should consider this as an option. Of course always confirm that the voltage matches the location where you are installing this device.
Operating System Compatibility:
This is very important, make sure the serial to USB adapter is compatible with your operating system, and when installing the drivers that are included with the product, check for the latest update. Manufacturers are frequently updating their software to fix bugs and add features. Its free, so take advantage of it.
What to watch out for.
While most serial to USB adapters on the market are compatible with current technology, always confirm that the cable and associated drivers are compatible with your system. Check the hardware requirements on either Amazons product page or the manufacturers' web site.
Conclusion
While serial computer devices will eventually become extinct, with a serial to USB adapter you can extend the life of many old reliable devices. In my 30+ years in the electronic and computer fields I've come to appreciate any device that can extend the life of my equipment.
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