Xclk; Auxin/Auxout Loopback - Quatech QSC-200 User Manual

8.3 XCLK

This is the output clock signal used by the transmitter portion of the UART. It is
generally connected to the UART's own receive clock input (RCLK). This is done by connecting
pins 3 and 6 of the jumper block. If desired, XCLK can be transmitted to an external source over
the AUXOUT line by connecting pins 5 and 6 of the jumper block. Figure 21 shows how to
select the XCLK mode.
XCLK
AUXOUT
RTS
Loopback XCLK to RCLK

8.4 AUXIN/AUXOUT Loopback

The AUXIN signal is an input from the external device, and connecting it to the
AUXOUT signal provides for a loop back mode of operation. In other words, whatever signal is
transmitted by the external device over the AUXIN line will be fed back to the external device
over the AUXOUT line. This mode is accomplished by connecting pins 2 and 5 of the jumper
block. Figure 22 shows how to select this loopback mode.
Quatech QSC-200/300 Users Manual
Jumpers J9, J11, J13, J15
3
6 RCLK
2
5 AUXIN
4 1
CTS
Figure 21 --- XCLK selection
Jumpers J9, J11, J13, J15
XCLK 6
5
AUXOUT
RTS 4
Loopback AUXOUT to AUXIN
Figure 22 --- AUXIN/AUXOUT loopback
XCLK 6
AUXOUT 5
RTS 4
Transmit XCLK on AUXOUT
3
RCLK
2
AUXIN
1
CTS
3
RCLK
2
AUXIN
1
CTS
31