The barcode scanner module is widely used. Today we will talk about the interface issues that everyone is most concerned about. First of all, we need to know what a physical interface is: In simple terms, a physical interface is connected to the main board by a physical line, such as RS485/RS232/TTL/USB, etc.

And what are the differences between these different data interfaces, we will explain them separately below:

USB interface: USB interface is divided into: USB Keyboard, USB CDC, USB HID POS

USB KB is our most commonly used USB interface, also known as the keyboard port, which is the most widely used.

USB CDC is a USB virtual serial port.

USB HID POS has the fastest transfer speed.

The USB interfaces of our XTIOT all have their own power supply, which can transmit data and power supply at the same time. Some devices do not have power supply in the USB, so they need to connect 2 lines, one for data transmission and one for power supply.

RS485/RS232/TTL are all serial ports, TTL is 3.3V, RS232 is 3-15V, RS485 is -7~12V, the greater the voltage difference, the longer the transmission distance.

In addition to USB keyboard, these interfaces require auxiliary tools to transmit data during data transmission, such as: serial port assistant.

If you don't understand the details, you can consult the engineers of XTIOT is equipped with complete pre-sale, in-sale and after-sale engineers.