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
6
5
AUXOUT
RTS
CTS
AUXIN
XCLK
RCLK
Transmit RTS on AUXOUT
Receive CTS on AUXIN
Loopback RTS to CTS
6
5
6
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
4
5
4
5
6
Figure 18 --- RCLK selection on J5, J7
7-2
Quatech Inc.
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