Quatech HSU-200 사용자 설명서

Introduction 

This Users Manual describes how to setup and install your Quatech 
Freedom USB Adapter. 

The Quatech SSU-100, DSU-100, QSU-100, ESU-100, and HSU-100, 

respectively, provide one, two, four, eight, and sixteen independent 
RS-232 serial interfaces to the host PC via the Universal Serial Bus 

(USB) port.  
The Quatech DSU-200/300, QSU-200/300, ESU-200/300, and HSU-
200/300, respectively, provide two, four, eight, and sixteen 

independent asynchronous serial interfaces via the USB port. Each of 
these interfaces can be used as desired for either RS-422 or RS-485 

communications. 
For convenience, this manual refers to all these products as Freedom 
USB unless otherwise noted.  
The following table details the port and connection configuration for 

all the Freedom USB devices. 

Table 1 - Device port and connection options 

SSU-100 1 

RS-232 

    

RS-422 

DSU-100 2 

RS-232 

  DSU-200/300 2 

RS-422 

QSU-100 4 

RS-232 

  QSU-200/300 4 

RS-422 

ESU-100 8 

RS-232 

  ESU-200/300 8 

RS-422 

HSU-100 16 

RS-232 

  HSU-200/300 16 

RS-422 

Each adapter comes standard with 16550 Universal Asynchronous 

Receiver/Transmitters (UARTs) containing 16-byte First In First Out 

(FIFO) storage devices. These FIFOs, in conjunction with the USB 
micro controller FIFOs, help to relieve the CPU of excessive 

interrupts by buffering received and transmitted data. This 

configuration allows each channel (either two or four) to obtain data 
rates up to 460.8 kbps. The adapters are USB bus-powered; therefore 

no external power supply is required. 

The Freedom USB products are Plug-and-Play devices and require no 
hardware configuration. Your computer's BIOS or operating system 

automatically configures the ports when you install the device.