System information

Physical Details
EPM-15 Reference Manual 21
JUMPER SUMMARY
Table 3: Jumper Summary
Jumper
Block Description
As
Shipped Page
V1
(or V5*)
COM4 RS-422/485 Termination
In – Line A and B terminated with 127 Ohms
Out – No termination
Note: Places terminating resistor across COM4 RS-485 TXRX+/TXRX-
or RS-422 RX+/RX- differential pair.
In 27
V2
Battery Power Jumper
[1-2] In – Standard Operation
[2-3] In – Erase CMOS
Warning: Use care when handling the EPM-15 not to short the V2 pins
accidentally, which may cause CMOS to revert to factory settings.
[1-2] In 23
V3
COM3 RS-422/485 Termination
In – Line A and B terminated with 127 Ohms
Out – No termination
Note: Places terminating resistor across COM3 RS-485 TXRX+/TXRX-
or RS-422 RX+/RX- differential pair.
In 27
V4[1-2]
CompactFlash Master/Slave Selector
In – Compact Flash Master Device
Out – Compact Flash Slave Device
In –
V4[3-4]
Video BIOS Selector
In – Primary Video BIOS selected
Out – Secondary Video BIOS selected
Note: The secondary Video BIOS is field-upgradeable using the BIOS
upgrade utility. See the private support page for more information.
In 32
V4[5-6]
System BIOS Selector
In – Runtime system BIOS selected
Out – Master system BIOS selected
Note: The Runtime System BIOS is field upgradeable using the BIOS
upgrade utility. See the private support page for more information.
In –
V4[7-8]
ACPI Pushbutton Enable
In – ACPI pushbutton disabled.
Out – ACPI pushbutton enabled.
In 25
* Jumper block V1 was labeled V5 on revision 3.xx and earlier boards.