Xerox FS 5250 IPC 用户手册

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Operation
Xerox FS 5250, User’s Guide
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7. Operation of the Xerox FS 5250
  
The Xerox FS 5250 top panel  has been designed to register the operation of
the box via the four following indicator LEDs :
CU (contact to control unit)
PAR (parallel input)
SER (serial input)
READY (printer)
7.1. Top Panel of the Xerox FS 5250
7.1.1 CU
The CU indicator has 3 states which signal the following:
State
Indication
ON
Contact with the control unit.
OFF
No contact of the control unit, or the contact
has been broken for more than 1 minute
7.1.2 PAR (Parallel input)
The indicator LED has 2 states:
State
Indication
ON
Indicates that the box is processing data from the
Centronics parallel port
OFF
Indicates that the box is idle or processing data from
the twinax/RS232 inputs