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
5
3
1
6
4
2
5
3
1
6
4
2
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
1
2
3
1
2
3
