Joined in 2023 
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Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 2012 R2, Windows 2016, Windows 2008 R2
If install STILL failed to install the drivers or above "Prolific..." device has a yellow triangle next to it, then: Install the driver file from the disc that came with the RS232 Device.A USB to serial adapter that uses the FTDI chipset. The chipset manufacturer, Future Technology Devices International (FTDI), is a Scottish semiconductor company specializing in USB interfaces. Yes, a RS232 to USB converter does have a full-blown UART circuit built-in. As any standard UART, it does have Rx, Tx, and flow control pins. As any UART, it must be properly configured to be able to communicate with the "partner" at the other end of UART link. Standard RS232 cables connect a DTE (Data Terminal Equipment) such as a desktop computer to a DCE (Data Communications Equipment), typically a modem, printer or special-purpose peripheral. These "straight through" serial cables connect pins on the sending device to the same pins on the receiving device (e.g. pin 1 to pin 1, pin 2 to pin 2 and so on). Verify RS232 device is connected to COM PORT number between 1 to 4. This is a MUST, else it will not work.
Parallel cables are much faster than serial cables but they are bulkier, more expensive and prone to signaling errors like crosstalk, especially over longer distances. Supports Windows 2000, Windows XP, Windows Vista 32/64-bit, Windows 7, Windows 10 and Mac OS 10.12.1. Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 2012 R2, Windows 2016, Windows 2008 R2
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Serial cables can also be used to connect two DTEs together but the pins must be wired so transmitter pins are connected to receiver pins. Cables that use this "crossover" wiring are known as null modem cables. When you plug a USB to Serial Adapter like the USA-19HS into a Windows 10 machine, it should appear in the Device Manager under Ports (COM & LPT). If you do not see this heading, go to the View menu and make sure Show Hidden Devices is selected. If you still do not see your adapter, you will need to install the manufacturer's driver for your device. Connect RS232 device into any USB port. This time Windows will auto-install the drivers. You can verify a correct install going to Device Manager. Here's how... Windows Vista/7/8/10: Serial to USB adapters are typically compliant with the USB 2.0 specification, with a data rate of 12 Mbps and support USB features such as suspend (device sleeps), resume (device wakes) and remote wake-up (device wakes host). Some devices will only connect to your computer using a port called "RS232 Serial Port". This port was used on old computers before 2003.
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