User manual

PPC-S155T User Manual 22

4.1.2.2 CN19 select COM1/3 pin 9 function

There are two options available to adjust the function of COM1/3. The default setting

selects COM1/3 RING function.

Figure 4.4 CN19 jumper settings

4.1.2.3 CMOS Clear for External RTC (JP1)

Table 4.1: CN19 select COM1/3 pin 9 function

COM 1/3 RING (Default) COM1/3 +5V

Table 4.2: CN19

Pins Function

1 - 3 COM1 +5V

3 - 5 COM1 RING default

2 - 4 COM3 +5V

4 - 6 COM3 RING default

531

642

531

642

Warning! To avoid damaging the computer, always turn off the power supply

before setting “Clear CMOS”. Set the jumper back to “Normal operation”

before turning on the power supply.

Table 4.3: Clear CMOS / External RTC (JP1)

Normal Operation Clear CMOS