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USB to multi-serial port product design

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USB to multi-serial port product design

 

 
In some applications, it is necessary to expand multiple serial ports for computers or other hosts. Common expansion methods include USB to multi-serial, PCI/PCIe to multi-serial, Bluetooth and Ethernet and other network to multi-serial ports.

Nowadays, most desktop computers and notebook computers no longer provide serial ports due to the need for light weight, while the USB interface has the advantages of high speed, small size, and support for plug-and-play, etc., and has become a variety of computers, embedded industrial control hosts, mobile phones, etc. The standard interface of the device.

In order to meet the needs of communicating with serial peripherals, the use of USB to serial makes this need extremely simple. In addition, with the advantages of fast USB bus speed and rich protocols, it can realize USB to 1-channel/2-channel/4-channel/8-channel serial port, and even cascade multiple USB-to-multi-serial devices through USB Hub to realize USB Switch to 16/32 serial port, etc.


Model Main chip

 

USB interface, serial port baud rate

USB to 1-Ch UART CH343/CH9101/2
  
WCH provides USB high-speed/full-speed to multi-serial serial chips, a single chip can realize USB to 1/2/4/8 serial ports, and can support Windows, Linux, Android, macOS and other operating systems.

The serial port provided by the chip is TTL level by default, and TTL serial port products can be designed directly, or RS232/RS485/RS422 and other level conversion chips can be added to realize USB to multi-serial port products of other interface types.
 
Supports various conventional serial port baud rates and the highest baud rate of 6Mbps, and the communication is continuous, efficient and stable at high baud rates;

Multi-system compatibility, support Windows/Linux/macOS/Android and other operating systems, compatible with various serial port software;

Each serial port has a built-in independent transceiver FIFO, which works independently and does not affect each other;

Support all MODEM contact signals RTS, DTR, DCD, RI, DSR, CTS, can also be used as GPIO for MCU download, IO control, etc.;

Support serial CTS and RTS hardware automatic flow control, high-speed continuous communication without packet loss;

Built-in Unique ID, the module is inserted into any USB port, the serial port number can be kept fixed, no need to manually find the serial port, and it is more convenient to use;

 

USB to multi-serial port - USB-to-dual serial port product based on CH342 chip
USB to 2 TTL serial ports
  


USB to 2 RS232 serial ports
USB to dual serial port product design-RS232 serial port
Based on the USB to 2-channel serial port chip CH342, it can expand 2 independent serial ports for various hosts

 

USB to 2 RS485 serial ports
USB to dual serial port product design-RS485 serial port
Based on the USB to 2-channel serial port chip CH342, it can expand 2 independent serial ports for various hosts

 

High-speed USB to multi-serial ports—USB to four serial ports based on CH344 chip
High-speed USB to 4-way TTL serial port
Based on 480Mbps high-speed USB to 8-channel serial port chip CH344Q, it can expand 4 independent serial ports for various hosts


USB to 4 RS232 serial ports
High-speed USB to 4 serial port product design-RS232 serial port
Based on the 480Mbps high-speed USB to 8-channel serial port chip CH344Q, it can expand 4 independent serial ports for various hosts. The CH344 chip supports the use of the built-in CDC serial port driver in the operating system, and also supports the use of the VCP serial port driver provided by the manufacturer, and can support Windows, Linux, Android, macOS and other operating systems. Due to the CDC class protocol and class driver, the CDC serial port function is not as complete as the VCP, and there are some differences in use.

 

USB to 4 RS485 serial ports
High-speed USB to 4 serial port product design-RS485 serial port
Based on the 480Mbps high-speed USB to 8-channel serial port chip CH344Q, it can expand 4 independent serial ports for various hosts.
 High-speed USB to multi-serial port - USB to eight serial port products based on CH348 chip
 
High-speed USB to 8 serial port product design-TTL serial port
Based on 480Mbps high-speed USB to 8-channel serial port chip CH348, it can expand 8 independent serial ports for various hosts

 

High-speed USB to 8-channel RS232 serial port
High-speed USB to 8 serial port product design-RS232 serial port
Based on 480Mbps high-speed USB to 8-channel serial port chip CH348, it can expand 8 independent serial ports for various hosts

 

High-speed USB to 8-channel RS485 serial port
High-speed USB to 8 serial port product design-RS485 serial port
Based on 480Mbps high-speed USB to 8-channel serial port chip CH348, it can expand 8 independent serial ports for various hosts

 

USB to TTL serial port

USB to RS232 serial port 

USB to RS485 serial port 

USB to multi-serial port 

 

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