Jumper Settings; How To Set Jumpers; Cmos Clear (Cmos1); System Memory - Advantech GMB-945GC User Manual

1.8

Jumper Settings

This section provides instructions on how to configure your motherboard by setting
the jumpers. It also includes the motherboards's default settings and your options for
each jumper.
1.8.1

How to set jumpers

You can configure your motherboard to match the needs of your application by set-
ting the jumpers. A jumper is a metal bridge that closes an electrical circuit. It consists
of two metal pins and a small metal clip (often protected by a plastic cover) that slides
over the pins to connect them. To "close" (or turn ON) a jumper, you connect the pins
with the clip. To "open" (or turn OFF) a jumper, you remove the clip. Sometimes a
jumper consists of a set of three pins, labeled 1, 2, and 3. In this case you connect
either pins 1 and 2, or 2 and 3. A pair of needle-nose pliers may be useful when set-
ting jumpers.
1.8.2

CMOS clear (CMOS1)

The GMB-945GC motherboard contains a jumper that can erase CMOS data and
reset the system BIOS information. Normally this jumper should be set with pins 1-2
closed. If you want to reset the CMOS data, set J1 to 2-3 closed for just a few sec-
onds, and then move the jumper back to 1-2 closed. This procedure will reset the
CMOS to its default setting.
Table 1.3: CMOS1
Function
*Keep CMOS data
Clear CMOS data
* Default
1.9

System Memory

The GMB-945GC has two sockets for 200-pin SODIMMx2.
All these sockets use 1.8 V unbuffered double data rate synchronous DRAMs (DDR
SDRAM). They are available in capacities of 256, 512 and 1024 MB. The sockets can
be filled in any combination with DIMMs of any size, giving a total memory size
between 256 MB and 2 GB. GMB-945GC does NOT support ECC (error correcting
code).
GMB-945GC User Manual
Jumper Setting
1
1-2 closed
1
2-3 closed
8