4. OPERATION
Being a communication device, Model 840
will operate with user intervention based
on signals received from a Curtis Model 1297
motor controller. Upon initial power-up, the instrument
will go through a self-diagnostic routine in which all
display elements will be illuminated for 1 second and
then blanked for 1 second. The LCD will then display
“all asterisks” until the first message is received. The
information on the display will then be controlled by
the Curtis Model 1297 motor controller.
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