Quatech SSCLP-300, SSCLP-200, DSCLP-200, DSCLP-300 user manual Tclk, AUXIN/AUXOUT Loopback

7.3 TCLK

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 not connecting pins 1 and 2 of the jumper block J13. If desired, TCLK can be transmitted to an external source over the AUXOUT line by connecting pins 1 and 2 of the jumper block J12. Figure 18 shows how to select the TCLK mode.

Jumpers J11-13

J11

J13RCLK0_SEL

J12

J13

AUX0_SEL0 AUX0_SEL1 RCLK0_SEL

Loopback TCLK to RCLK Transmit TCLK on AUXOUT

Figure 18 --- TCLK selection

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 1 and 2 of the jumper blocks J11 and J12. Figure 19 shows how to select this loopback mode.

Jumpers J11-13

J11

J12

J13

AUX0_SEL0 AUX0_SEL1

RCLK0_SEL

Loopback AUXOUT to AUXIN

Figure 19 --- AUXIN/AUXOUT loopback

DSCLP/SSCLP-200/300 User's Manual 40