
EPC-7 Hardware Reference
MAKE SURE THAT THE PROCESS DESCRIBED HERE IS PERFORMED
IN A STATIC
-
FREE ENVIRONMENT
.
First remove the upper two EXM modules, if present. Remove the side panel from
the EPC-7 and locate the battery. The battery cell is held in place by a spring lever.
To remove the battery, apply downward pressure to the cell in the vicinity of the base
of the spring (a small screwdriver may be used), while at the same time applying
lateral pressure to the cell in the direction away from the spring base.
5
5
Apply downward pressure here
Push cell out in
this direction
RAYOVAC
BR2335
Figure 14. Battery Removal.
A new cell is installed by sliding it beneath the spring until it snaps into the holder.
Ensure that the spring has not been damaged and that it is in firm contact with, and
applying downward pressure on, the battery cell.
Watchdog Timer
The EPC-7 contains a continually running timer having a period of either about 0.2 or
6.7 seconds (software selectable). This event may be enabled as a source of the
IRQ10 interrupt, or as a hardware reset, depending on the outcome of a comparison
of registers 8154 and 8155. The watchdog timer event is generated whenever the
period expires if the watchdog timer bit is set in 815Dh and the watchdog timer bit is
set in the event enable register at 8155h. Otherwise this is masked off. The timer is
reset to its maximum value by an I/O read of the module status/control register @
815Dh.
Page 30
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Содержание EPC-7
Страница 125: ...Index I 7 I I Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 126: ...Index I 8 I I Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 127: ...I 5 I I Index Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 128: ...Index I 6 I I NOTES Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 129: ...Index I 7 I I Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...