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Chapter 3 System Setup 29
3.4 CMOS Clear for External RTC (J3)
This jumper is used to erase CMOS data and reset system BIOS informa-
tion.
The procedure for clearing CMOS is:
1. Turn off system.
2. Short pin 2 and pin 3.
3. Return jumper to pins 1 and 2.
4. Turn on the system. The BIOS is now reset to its default setting.
3.5 COM Port Interface (J6, J7)
The panel PC provides four serial ports (COM1, 3, 4: RS-232; COM2:
RS-232/422/485) in one COM port connector.
3.5.1 COM2 RS-232/422/485 setting (J6)
COM2 can be configured to operate in RS-232, RS-422, or RS-485 mode.
This is done via J6.
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 3.3: CMOS clear (J3)
*Normal operation Clear CMOS
* default setting