User`s manual

Quatech USB-to-Serial Adapter User’s Manual Using configuration utilities
AuxOut/AuxIn (MEI adapters only)
This setting determines which signals are routed to the AuxIn and
AuxOut pins of the serial port connectors. Regardless of which setting
is chosen, each UART's DTR output is internally looped back to its
own DSR, DCD, and RI inputs.
Loopback (default)
Select this choice when only transmit and receive data signaling is
required.
Note: In half-duplex (2-wire)
modes, the UART’s RTS
output is looped back to its
CTS input.
¾ Each UART's RTS output is internally looped back to its CTS
input.
¾ Each port's AuxIn signal pair is looped back to its AuxOut
signal pair at the connector.
RTS/CTS
Select this choice when hardware flow control is required.
¾ Each UART's RTS output and CTS input are routed to the
AuxOut and AuxIn signal pairs, respectively.
Rev 1.00 (August 2006) Page 23