Hercules-EBX CPU User Manual V1.02
Page 33
5. JUMPER CONFIGURATION
Refer to the Hercules board drawing on page 9 for locations of the configuration items mentioned
here.
5.1 J4: System Configuration
Jumper block J10 is used for configuration of IRQ levels, ATX power control, and CMOS RAM.
Battery
DAQ IRQ
9
ATX
4
5
15
3
COM4 IRQ
COM3 IRQ
7
COM3
COM4
RS485
Termination :
Figure 1 : J4 – System Configuration Header
Serial Port and A/D IRQ Settings
COM3 may be directly set to IRQ3, IRQ4, or IRQ9. COM4 may be directly set to IRQ3 or IRQ15.
The A/D circuit (on models that include Data Acquisition) may be set to IRQ4, IRQ5, or IRQ7. It is
possible to share an interrupt with an on-board resource (share IRQ3 with COM2, for instance),
provided that the OS or driver can handle thee IRQ sharing.
ATX Power Control
The ATX power control is set with this jumper block. If the ATX jumper is in, ATX works normally;
an external momentary switch may be used to turn power on and off. A quick contact turns the
power on, and a long contact (> 4 seconds) turns the power off. If the ATX jumper is out, the ATX
function is bypassed and the system will power up as soon as power is connected.
Erasing CMOS RAM
The CMOS RAM may be cleared by removing a jumper as shown on the next page. This will
cause the CPU to power up with the default BIOS settings. To clear the CMOS RAM, power down
the CPU, remove the jumper as shown, wait a few seconds, return it to its default position, and
then power up again.
Before erasing CMOS RAM, write down any custom BIOS settings you have made!
Default Settings
J4
ATX / INT / COM
BAT
15
C4
3
C3
AD
7 C4T
C3T
5
4
AD
C3
9
ATX
Battery connected
COM3 = IRQ9
COM4 = (no IRQ)
DAQ = IRQ5
(no RS485 termination)
Default
Settings:
Figure 2 : J4 – Default Jumper Settings
