Quatech HSU-200 사용자 설명서

All Loopback (default) 

Select this radio button when only transmit and receive data 

signaling is required.  

Each UART's RTS output is internally looped back to its CTS 

input.   

 

 

Each port's AuxIn signal pair is looped back to its AuxOut 
signal pair at the connector.  

Modem Control 

Select this radio button when hardware flow control is required.   

Each UART's RTS output and CTS input are routed to the 

AuxOut and AuxIn signal pairs, respectively.   

 

 

Duplex Mode (DSU/QSU/ESU/HSU-200/300 only) 

Full Duplex (default) 

Select this radio button to allow simultaneous transmit and receive 

operation. Transmit and receive data must move over separate 

dedicated pairs of conductors in the attached cable. Each UART's 
transmit drivers are always active in this mode. 

Half Duplex using RTS 

Select this radio button to allow communication in only one direction 

at a time. Transmit and receive data can share a single pair of 
conductors in the attached cable. The software application can disable 

the port's transmit drivers by deasserting the UART's RTS output. To 

allow transmission again, the software application must assert the 
RTS output. 

Half Duplex using DTR 

This mode operates the same as Half Duplex using RTS, except that 

the UART's DTR output is used. 

Half Duplex Automatic Transmitter Control 

If this box is checked when using a half duplex mode, the USB serial 
adapter will automatically control the RTS or DTR signal to enable 

and disable the transmit drivers. The transmit drivers will be 
enabled when there is data from the software application ready to be 

sent. The transmit drivers will be disabled after all data has been 

transmitted and the device drivers' internal transmit buffers are 
empty. 
The USB serial adapter inserts a delay between the movement of the 

final character into the UART and the disabling of the transmitter to 
allow time for the final character to be fully transmitted. The 

minimum length of this time can be calculated as follows: 
delay (us) = 3.3µs * (baud rate divisor / data rate multiplier) + 20.5µs