Quatech QSP-200/300 - Manual (Page 43)

6.3.2 Auxiliary Channel: Handshaking Disabled
The QSP-200/300 ports may be configured so that the RTS-CTS handshake is disabled. This is
the default configuration. In this configuration, RTS and CTS from the 16C550 UART will be
looped back to each other. In addition, the auxiliary output and input signals will be looped back
to each other. This configuration is shown below:
RS-422/485
+
+
+
+
-
-
-
-
16C550
UART
DATA OUT
DATA IN
AUX OUT
AUX IN
TXD
RXD
-RTS
-CTS
Drivers/Receivers
Driver
Receiver
Driver
Receiver
Figure 6. Auxiliary Channel Handshaking Disabled
QSP-200/300 User's Manual 37