Gasboy CFN Series Diagnostic Manual - Manual (Page 30)

GASBOY CFN Series
2-4 0021
SITE CONTROLLER CPU PCB
The site controller CPU PCB controls all activity in the site controller. There are three versions of
this PCB:
Site Controller CPU (C04835)
This is the original CPU PCB and is in very few site controllers. It controlled up to 128K of RAM.
This PCB is not documented in this manual.
Site Controller Memory Plus CPU (C04940)
This version provided additional space for on-board RAM and ROM. It controls up to 128K of
RAM.
Site Controller I CPU - 512K (C05820)
This version allows the use of 128K or 512K of RAM.
NOTE: EPROM's are not interchangeable between CPU PCB's.
The CPU PCB:
•
processes all site controller data
•
communicates to all CFN equipment via the RS-485 lines
•
communicates to the RS-232 equipment
•
controls the memory PCB
•
contains the system program (EPROM & EEROM)
•
contains on-board scratchpad RAM
•
provides diagnostic LED's
•
provides a manual reset switch