Quatech DS-200, User Manual

Page: 31 / 41

7.3 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 pack. If
desired, XCLK can be transmitted to an external source over the AUXOUT
line by connecting pins 5 and 6 of the jumper pack. Figure 19 shows how
to select the XCLK mode.
1 3 2
6 7
AUXOUT
RTS
CTS
AUXIN
XCLK
RCLK
1 3 2
7
AUXOUT
RTS
CTS
AUXIN
XCLK
RCLK
Loopback XCLK to RCLK
Transmit XCLK on AUXOUT
4
5
4
Figure 19 --- XCLK selection on J5, J7
7.4 AUXIN/AUXOUT Loopback
The AUXIN signal is an input from the external device, and connecting it
to the AUXOUT signal provides for a loopback 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
pack. Figure 20 shows how to select this loopback mode.
1 3
2
6
AUXOUT
RTS
CTS
AUXIN
XCLK
RCLK
Loopback AUXOUT to AUXIN
4 6
Figure 20 --- AUXIN/AUXOUT loopback on J5, J7
DS-200/300 User's Manual 7-3