Quatech SSP-200, SSP-300 user manual Auxiliary Channel Handshaking Disabled

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:

16C550 UART

TXD

RS-422/485

Drivers/Receivers

DATA OUT +

Driver

-

DATA IN

RXD

Receiver

+

-

AUX OUT +

Driver

AUX IN

-

+

-RTS

-CTS

Receiver

-

Figure 0. Auxiliary Channel Handshaking Disabled

6-2 SSP-200/300 (Rev. I and later) User's Manual