If you are having problems with your USB to RS232 serial connection then troubleshooting it will help. We will have to complete a loop-back test to confirm that there is a connection. This will tell you if there is a connection as well as is it a UART driver problem or is it a hardware issue that has been overlooked. This will work with most USB serial RS232 adapters which you will find on the market.
USB to Serial
These are the serial ports from different manufactures. Some prefer to have a PCI card rather than an adapter. These serial port cards will allow you to have more COM ports on your computer than what you would normally have available on todays computers. You can see a list of USB to serial adapters on this website as well as the the list of USB to Serial also on here.
If you are looking for a USB to Serial driver then you will first need to know what processor the convertor is using. You will also need to know which type of serial device you are trying convert to. This can be a USB to Serial RS232 which covers the processors from the MosChip, FTDI as well as Prolific. There is also the USB to Serial RS485 and RS422 which covers the same Prolific processor as well as FTDI and SilLabs.
The CP2104 USB to UART Driver is added below and is widely used on a number of UART bridges. The adapter we are covering here is the module which is a USB adapter or programmer for the ESP01 which is based on ESP8266 WiFi micro-controller. This module uses the CP2104 USB serial port chip and will also add the ESP01 automatic download circuit. This WiFi module will automatically enter the download mode.
The UC00C (CH340) USB to UART Converter is a well known low cost alternative to the popular FTDI USB to UART converter. It much like other works with both 3.3V as well as a 5V system. The UART driver has also been added below. The serial communication in particular the UART (Universal Asynchronous Receiver and Transmitter), is one of the most commonly used communication protocol for computers. There are certain versions of the Arduino main boards have USB to UART converter built-in.
This is the Cytron USB to UART Converter overview. You can see further down how this works as well as it driver. This is similar to the RS232 adapter as well as the FT232R USB UART driver which is also on this website. The Cytron USB to UART converter driver is also listed below for download. The serial communication way of communication is the most popular interface which is used between devices and this applies to the micro-controller as well as the computer. The UART port is one of those serial interfaces.
The Thunderlinx USB to Serial adapter is most probably the most well known USB to serial adpater that uses the FT231X processor. This USB to Serial adapter converts serial data to USB data and vice versa. There are a few advantages to this newer technology as have been explained below and may be of interest to you if you are in a complex environment.
When we talk about the RS485 we first need to know that is stands for the “Recommended Standard no. 485” and that it is the serial communication standard which was established in 1998. The standard is used in many industrial equipment as the signal can be sent far and can still be sent simultaneously at multiple points. This uses Half duplex communication meaning that it can only send information in one direction at a time.
If you are trying to convert the RS232 signal to another signal such as the RS422 then your will need a RS232 – RS422 converter to achieve this. The XS202 from US Converters LLC is a bi-directional RS232 to RS422 converter which is port powered how you can add additional power if needed such as an external 5VDC power source which needs a 6 pin DB9 Terminal Block Header.
The following USB to Serial devices are all from Prolific and they all use the same USB to serial driver which you can also find on this website. Note that there are UART as well as Serial and Printer chips which they make. You will find this rather easy to understand.Search this website for more Prolific device drivers.
The PL2303TA is a USB to Serial Bridge Controller from Prolific. The chipset provides USB to straight-through RS232 serial connectivity at baud rates up to 128Kbps. This allows you to use a USB port in your computer to a RS232 type devices such as point-of-sale terminals, serial modems as well as industrial equipment.