Quatech DSCLP-300, SSCLP-300, SSCLP-200, DSCLP-200 user manual RTS/CTS Handshake, Rclk

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 not connecting pins 1 and 2 of the jumper blocks J11-12. CTS is received on AUXIN by not connecting pins 1 and 2 of the jumper block J10. If RTS/CTS handshaking is not desired, the RTS output can be looped back to the CTS input by connecting pins 1 and 2 of the jumper block J10. Figure 16 shows how to select the RTS/CTS mode.

Jumpers J10-12

J10 CTS0_SEL

J11 AUX0_SEL0

J12AUX0_SEL1

Transmit RTS on AUXOUT Receive CTS on AUXIN

J10 CTS0_SEL

J11 AUX0_SEL0

J12AUX0_SEL1

Loopback RTS to CTS

Figure 16 --- RTS/CTS selection

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 (TCLK). This is done by not connecting pins 1 and 2 of the jumper block J13. If desired, RCLK can be received from an external source over the AUXIN line by connecting pins 1 and 2 of the jumper block J13. Figure 17 shows how to select the RCLK mode.

Jumper J13

J13 RCLK0_SEL J13

Loopback TCLK to RCLK

RCLK0_SEL

Receive RCLK on AUXIN

Figure 17 --- RCLK selection

DSCLP/SSCLP-200/300 User's Manual 39