Signal Connections - Quatech QSC-200 User Manual

2.2 Signal Connections

The QSC-200/300 provides each of four serial ports with four differential signal pairs:
TxD, RxD, AUXOUT, and AUXIN. TxD and RxD are always present at the connector. The
AUXOUT and AUXIN signals can be used to support RTS/CTS handshaking, external clocking,
or external signal loopback. The factory default configuration, as shown in Figure 2, is a
loopback of AUXOUT to AUXIN at the connector, with RTS and CTS looped back on the
board. There is an extensive discussion of this topic in section 8.1.
2.3 Full-duplex/Half-duplex Operation
The DTR or RTS modem control output of the UART can be used to enable and disable
the transmit drivers. The inverse of these signals can also be used to enable and disable the
receivers. These options are selectable per channel. The factory default, as shown in Figure 2, is
for both the drivers and receivers of all channels to be continuously enabled. Two spare jumpers
are installed in neutral positions. For details, refer to section 8.5.
The QSC-200/300 is shipped from the factory with each channel configured as shown in
Figure 2.
XCLK
AUXOUT
Loopback AUXOUT to AUXIN
Tx ENABLE
Tx ENABLE
Tx ENABLE
Quatech QSC-200/300 Users Manual
3
6 RCLK
2
AUXIN
5
RTS 4 1
CTS
Loopback RTS to CTS
Loopback XCLK to RCLK
3
6
Rx ENABLE
RTS
2
5
4 1 DTR
Full Duplex Operation
(spare jumpers supplied)
Figure 2 --- Factory default signal interface settings
Jumpers
J9, J11, J13, J15
Jumpers
J10, J12, J14, J16
10