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1.The USB to TTL serial cable: such as TTL-232R-3V3;TTL-232R-5V;TTL-232R-3V3-RJ; TTL-232R-5V-RJ ; TTL-232R-RPI ; TTL-232RG-VREG1V8-WE ; TTL-232RG-VREG3V3-WE ; TTL-232RG-VSW5V-WE; TTL-232RG-VSW3V3-WE; TTL-232RG-VSW3V3-PCB; TTL-232RG-VIP-WE; TTL-232R-5V-PCB ; TTL-232R-5V-PCB……
2.The USB to RS232 converter cable: Such as USB-RS232-PCB; USB-RS232-WE-1800-BT-5.0 ; USB-RS232-WE-1800-BT-0.0 ; USB-RS232-WE-1800-3.3 ……
3.The USB to RS485 adapter cable: Such as USB-RS485-PCB ; USB-RS485-WE-1800-BT ; USB-RS485-WE-5000-BT……
4.The USB to RS422 serial cable: Such as USB-RS422-PCB ; USB-RS422-WE-1800-BT ; USB-RS422-WE-5000-BT…..
5. The USB to Hi-Speed UART Serial Adapter Cable: Such as C232HD-EDHSP-0 ; C232HD-DDHSP-0 ; C232HD-DDHSP-0 ; C232HM-DDHSL-0 ; USB NMC-2.5M ……
6. The Customization cable based FTDI chipset: Such as DB9, DB15 and DB25 ;Din 6 and Din8 ;Molex Terminal etc customer required all terminal according your application
Now we do test example based USB to RS232 converter cables :
USB rs232provide a simple communication method between serial devices with RS232 to modern USB supported devices. FTDI cable comes with an internal mounted electronic circuit which uses FTDI FT232R chip. This FTDI chip converts USB data to serial and vice versa. In other words, this cable provides an effective and cheap solution to connect TTL serial interface to USB.
To use this FTDI cable, we need a device driver which is available to download freely from FTDI website. After installation of device drivers , the US232R adapter appears as a virtual COM port in device manager settings.
This USB to serial converter is available in marker in two types. One type is just a converter module and there is USB cable connected with it as shown in figure below. If you are using this module, you will have to connect an external USB cable with this device to connect with the computer.
Another type of converter is FTDI cable which contains USB to serial converter circuitry inside the connector ,The most important point to note here is that both types use the same FT232R chip. Also, the driver installation and working procedure is the same for both. Therefore, you can use any one of these modules available with you.
The following figure shows the pinout diagram of the FTDI USB to RS232 converter. It consists of 6 pins. But mostly four pins are used to connect UART based devices with the computer through this FTDI cable. Out of these four pins, two are power supply pins such as Vcc and GND. Two other pins are Rx and Tx Pins.
The other side of the FTDI cable is just a type-A USB connector. You can simply plug it into your computer or laptop.
Now let’s first see the pin details of serial side device. Following are the details and functionality of all pins.
· Back (GND): Connect to the ground pin of the device to which you want to connect with the computer
· Brown (CTS): Clear to Send = This is control input and is used to clear the send request of Data.
· Red (Vcc): Connect it with Vcc
· Orange (TxD): Transmit Asynchronous Data = This is an output pin and used to transmit output data asynchronously
· Yellow (RxD): Receive Asynchronous Data = This is an input pin and used to receive input data asynchronously.
· Green(RTS): This is a control output pin and is used to make a request for sending the data.
Inside USB connector a USB series “A” connector is used to make a connection to a USB Host or computer. This is a USB 2.0 device.(or TYPEC 2.0 device is ok too)
The detailed description of these pins is as follows.
Power : This is a power pin and used to provide power from upstream USB Hub or HOST.
· D-: This is a bidirectional pin and is used as a data signal for USB. It has negative polarity.
· D+: This is a bidirectional pin and is used as a data signal for USB. It has a positive polarity.
· Ground: This is a power pin and provides a ground signal of power from a USB Hub or HOST.
· Shield: This is sheet outside the connector and used to prevent electromagnetic interferences from other devices to prevent data from manipulation. This is connected to the case of the host PC.
We do not need to worry about these USB pin details. Above information is provided just for your informatio
