Xerox FS 3270 instruction manual SER Serial input, Ready Printer Ready

Operation

Xerox FS 3270, User's Guide

SER (Serial input)

The indicator LED has 3 states

State	Indication
ON	Indicates that the box is processing data from the
	RS-232 Serial input
BLINKING	Indicates that the box has defined the RS-232 as
	output for the box.
OFF	Indicates that the box is idle or is processing data
	from the coax/Centronics inputs.

READY (Printer Ready)

The indicator LED has 3 states:

State	Indication
ON	Indicates that the connected printer is ready; i.e.
	that printer's "Select" condition is active and the
	"PE" signal is inactive. If the connected printer is
	an RS 232 printer, the ready validation is done by
	the "DTR" signal.
OFF	Indicates that the connected printer is not ready
	for data input.
BLINKING	Indicates a not-ready condition

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