User's Manual

4.3 Jumper Settings
4.3.1  CMOS Clear for External RTC (JP2)
Warning!  1.  To avoid damaging the computer, always turn off  the power supply 
before setting “Clear CMOS.”
2.
 Set the jumper back to “Normal Operation” before turning on the 
power supply!
Table 4.3: Clear CMOS / External RTC (JP1)
Normal Operation (Default) 
Clear CMOS
1 
23 1 23 






4.3.2  Power Input Voltage Setting (JP1)
TREK-550 must be configured properly according the power input range.
Table 4.4: Power Input Voltage Selection (JP1)
12V
Input (Default) 
24V Input
1 
23 1 23 



4.3.3 Pin 9 of COM3 Function Selection (JP3)
Pin 9 on COM3 port can be configured as RI, 5V or 12V output.
Table 4.7: Pin 9 of COM3 Function Selection (JP3)
RI +5VDC (max. 500mA) +12VDC (max. 250mA)
1 5 1 5 1 5
4.3.4
 Pin 9 of COM8 Function Selection (J3)
Pin 9 on COM8 port can be configured as RI, 5V or 12V output.
Table 4.7: Pin 9 of COM8 Function Selection (J3)
RI +5VDC (max. 500mA) +12VDC (max. 250mA)
1 6 1 6 1 6
TREK-550 User Manual  24