Gasboy CFN Series Diagnostic Manual - Manual (Page 197)

Pump Control Unit
12/26/02 6-7
Jumpers
Jumper K1 supplies the charge voltage to the battery. It is shipped installed. It should only be
removed if you are making a charge current measurement. Jumper K2, when installed, allows
battery backup power to the CPU IC at U3. The jumper should be installed during normal
operation and removed for storage. The CPU board is shipped with K2 removed.
Switches
SA - Reset Switch
The Reset switch starts a hardware and software reset of the CPU PCB. The SB and SC switch
settings are read when a reset occurs (and at power up). This switch should be pressed
whenever switch settings are changed.
SB - Address Switches
An address must be set to
identify the pump control unit
when it is connected to the
GASBOY CFN Series Fuel
Management System. This
address is a unique identifier
for when multiple PCU's are
connected on the same RS-
422 line. Addressing should
start at 1 and continue
sequentially through 16. The
physical wiring order does not
have to correspond with the
address order, that is, the first
unit on the RS-422 line does
not have to be address 1. The
chart on the right gives the
switch settings for the address
selections.