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7.1 RTS/CTS handshake
Transmission of RTS, combined with reception of CTS, allows for hardware
handshaking (data flow control) between the UART and the external device. RTS
is transmitted on AUXOUT by connecting pins 4 and 5 of the jumper pack. CTS
is received on AUXIN by connecting pins 1 and 2 of the jumper pack. If
RTS/CTS handshaking is not desired, the RTS output can be looped back to the
CTS input by connecting pins 1 and 4 of the jumper pack. Figure 17 shows how
to select the RTS/CTS mode.
1 3
2
5
AUXOUT
RTS
CTS
AUXIN
XCLK
RCLK
1
3
2
65
AUXOUT
RTS
CTS
AUXIN
XCLK
RCLK
Transmit RTS on AUXOUT
Receive CTS on AUXIN
Loopback RTS to CTS
656
Figure 17 --- RTS/CTS selection on J5, J7
7.2 RCLK
This is the clock signal used by the receiver portion of the UART. It is generally
provided by connecting it to the UART's own transmit clock output (XCLK).
This is done by connecting pins 3 and 6 of the jumper pack. If desired, RCLK can
be received from an external source over the AUXIN line by connecting pins 2
and 3 of the jumper pack. Figure 18 shows how to select the RCLK mode.
1
3
2
AUXOUT
RTS
CTS
AUXIN
XCLK
RCLK
1 3
2
7
AUXOUT
RTS
CTS
AUXIN
XCLK
RCLK
Loopback XCLK to RCLK
Receive RCLK on AUXIN
45
456
Figure 18 --- RCLK selection on J5, J7
7.3 XCLK
DS-200/300 User's Manual 7-2