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Chapter 4 Jumper Settings and Connectors
35
4.2 CMOS Clear for External RTC (JP7)
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 (JP7)
*Normal operation Clear CMOS
* default setting
4.3 COM-port Interface
The panel PC provides four serial ports (COM1, 3, 4: RS-232; COM2:
RS-232/422/485) in one COM port connector.
4.3.1 COM2 RS-232/422/485 setting (JP2, JP3, JP4)
COM2 can be configured to operate in RS-232, RS-422, or RS-485
mode. This is done via JP3, JP4 and JP5.
Table 4-4: COM2 RS-232/422/485 setting (JP2, JP3)
*RS-232 RS-422/485
* default setting
123
1 23
26
15
JP2
JP3
26
15
JP3
JP2
26
15
26
15