Chapter 3
Hardware
28
Reference Manual
CoreModule 740
Miscellaneous
Real Time Clock (RTC)
The CoreModule 740 contains a Real Time Clock (RTC). The RTC can be backed up with a battery. If the
battery is not present, the board BIOS has a battery-less boot option to complete the boot process.
Oops! Jumper (BIOS Recovery)
The Oops! jumper function is provided in the event the BIOS settings you have selected prevent you from
booting the system. By using the Oops! jumper you can prevent the current BIOS settings in flash from
being loaded, allowing you to re-load default settings.
Use a jumper to connect the DTR pin (4) to the RI pin (9) on Serial Port 1 (COM 1) prior to boot-up to
prevent the present BIOS settings from loading. After booting with the Oops! jumper in place, remove the
Oops! jumper and return to BIOS Setup. You must now load factory defaults by selecting
Load Optimal
Defaults
from the
Exit
menu. Then select
Save Changes and Exit
to reboot the system. Now you can modify
the default settings to your desired values. Ensure you save the changes before rebooting the system.
To convert a standard DB9 connector to an Oops! jumper, short together the DTR (4) and RI (9) pins on the
front of the connector as shown in
on the Serial Port 1 DB9 connector.
Figure 3-1. Oops! Jumper Serial Port (DB9)
Serial Console
The CoreModule 740 BIOS supports the serial console (or console redirection) feature. This I/O function is
provided by an ANSI-compatible serial terminal, or the equivalent terminal emulation software running on
another system. This can be very useful when setting up the BIOS on a production line for systems that are
not connected to a keyboard and display.
Serial Console Setup
The serial console feature is implemented by entering the serial console settings in BIOS Setup Utility and
connecting the appropriate serial cable (a standard null modem serial cable or “Hot Cable”) between one of
the serial ports (serial 1 or 2), and the serial terminal or a PC with communications software.
Hot (Serial) Cable
To convert a standard serial cable to a “Hot Cable”, certain pins must be shorted together at the Serial port
connector or on the DB9 connector. Short together the RTS (7) and RI (9) pins on either serial port DB9
.
Figure 3-2. Serial Console Jumper
CM740_Oopsjump
Standard DB9 Serial
Port Connector (Male)
Front View
5
4
3
2
1
9
8
7
6
CM740_HotCable
Standard DB9 Serial
Port Connector (Female)
Rear View
5
4
3
2
1
9
8
7
6