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6.1.2 Auxiliary Channel: Handshaking Disabled.
The SSP-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 16C750
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 0. Auxiliary Channel Handshaking Disabled
6-2 SSP-200/300 (Rev. I and later) User's Manual