Serial (COM) ports have been a standard feature on computers for decades. However, with the rise of USB, many newer computers no longer have serial ports. This has led to the need for adapting serial devices to work with USB. One common adaptation involves connecting a 9 pin serial connector to a USB port. This article will provide a wiring diagram for such a connection, as well as answer some frequently asked questions about this type of setup.
Wiring Diagram
The following diagram shows the wiring connections for a 9 pin serial to USB adapter:
| 9 Pin Serial Connector | USB Connector |
|---|---|
| Pin 2: RXD | Pin 2: D- |
| Pin 3: TXD | Pin 3: D+ |
| Pin 5: GND | Pin 4: GND |
Note that some serial devices may require additional pins to be connected, so this diagram may not be applicable in all cases. Always refer to the documentation for your specific device.
Frequently Asked Questions
Q: Why would I need to connect a serial device to a USB port?
A: As mentioned earlier, many newer computers no longer have serial ports. Additionally, USB is generally faster and more reliable than serial connections. By adapting a serial device to work with USB, you can continue to use it with modern computers.
Q: Will this adapter work with all serial devices?
A: No. Some serial devices require additional pins to be connected, beyond what is shown in the wiring diagram above. In addition, some devices may not be compatible with USB adapters at all. Always refer to the documentation for your specific device to determine if it can be adapted to work with USB.
Q: Are there any limitations to using a USB adapter for serial devices?
A: Yes. While USB is generally faster and more reliable than serial connections, there are some limitations. For example, USB adapters may not support all of the same baud rates as a dedicated serial port. Additionally, some high-speed serial devices may not be able to operate at their full speed when connected to a USB adapter.
Q: Can I use any USB to serial adapter?
A: No. There are many different USB to serial adapters on the market, and not all of them will work with all devices. It is important to choose an adapter that is compatible with your specific device. In addition, some adapters may require special drivers or software to work properly. Always refer to the documentation for your specific adapter.
Q: How do I install drivers for a USB to serial adapter?
A: Most USB to serial adapters will come with a CD or DVD containing the necessary drivers. Simply insert the disc into your computer and follow the on-screen instructions to install the drivers. Alternatively, you may be able to download the drivers from the manufacturer’s website.
Conclusion
Adapting a 9 pin serial device to work with USB can be a useful solution for those who no longer have serial ports on their computers. However, it is important to choose the right adapter and consult the documentation for your specific device to ensure compatibility and proper wiring connections.
