Clock Frequency Setting; Installing Into The Pc - Advantech PCL-720 User Manual

PCL-720
---------------------------------------------
I/o port
address
(Hex)
---------------------------------------------
200-207
208-20F
.
.
* 2A0-2A7
2A8-2AF
.
.
2E8-2EF
.
2F8-2FF
3E8-3EF
3F8-3FF
---------------------------------------------

2.3. Clock Frequency Setting

The PCL-720 offers on-board clock sources those are 1 MHz, 100 KHz and 10
KHz when a jumper is placed on the position marked " xl" of JP1. These
frequencies can be double, half or quartered by placing a jumper on position
"x2", "x1/2" or "xl/4" of the JP1. For example, a frequency source of 25 KHz
can be got from the pad marked "100K" when placing the jumper on position
"x1/4" of the JP1 as below.
oo x2
* oo xl
oo x1/2
oo x1/4
JP1

2.4. Installing into the PC

POWER MUST ALWAYS BE SWITCHED OFF when removing or inserting the
PCL-720 card and connecting or disconnecting cables.
Use a screw driver to remove the cover mounting screws from the rear of the
system unit.
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Switch position
1 2 3 4
A8 A7 A6
0 0 0 0
0 0 0 0
0 1 0 1
0 1 0 1
0 1 1 1
0 1 1 1
1 1 1 1
1 1 1 1
5 6
A5 A4 A3
0 0
0 1
0 0
0 1
0 1
1 1
0 1
1 1
* : Factory setting
Installation