Auxiliary Channel: Handshaking Disabled - Quatech QSP-200/300 User Manual

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:
QSP-200/300 User's Manual
16C550
UART
TXD
RXD
-RTS
-CTS
Figure 6. Auxiliary Channel Handshaking Disabled
RS-422/485
Drivers/Receivers
DATA OUT
Driver
DATA IN
Receiver
AUX OUT
Driver
AUX IN
Receiver
+
-
+
-
+
-
+
-
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