Operation Of The Xerox Ls 3270; Indicators Of The Xerox Ls 3270; Cu (Contact With Control Unit); Par (Parallel Input) - Xerox LS 3270 User Manual

Operation
Xerox LS 3270

3. Operation of the Xerox LS 3270

The Xerox LS 3270 top panel has been designed to register the
operation of the box via the following indicator LEDs :
•
CU (contact to Control Unit)
•

PAR (parallel input)

See the illustration in the section Knowing the Front Panel for the
position of the LEDs.

3.1. Indicators of the Xerox LS 3270

CU (Contact with Control Unit)

This indicator LED has 3 states:
State
ON
BLINKING
OFF
PAR (Parallel input)
The indicator LED has 2 states:
State
ON
OFF
Indication
Contact with the control unit.
1. Contact with the control unit, and data pending
in the Xerox LS 3270 buffer.
2. Indicates that the address switch has been
activated and the box is ready to enter on-line
HEX dump mode
No contact to the control unit, or the contact has
been broken for more than 1 minute.
Indication
Indicates that the box is processing data from the
Centronics parallel port
Indicates that the box is idle or processing data
from the coax input
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