Rs-422 Polarity; Serial Buffer - IBM 1220 User Reference

RS-422 Polarity

Purpose:
To establish the behavior of the positive and negative signals when using RS-422 serial
communication.
Values:
Normal* Uses default definition of one and zero.
Reverse Reverses the definition of one and zero, thereby allowing a positive connection to a
host's negative terminal without changing the physical cable.

Serial Buffer

Purpose:
To configure the size of the serial input buffer.
Values:
Disabled
Auto*
3K to maximum
size allowed
Note: Changing the Serial Buffer menu item automatically resets the printer.
See also:
Resource Save
Disables job buffering. Any jobs already buffered on the disk are printed before
normal processing of incoming jobs resumes.
Printer automatically calculates the Serial Buffer size (recommended setting).
User specifies the Serial Buffer size. The maximum size depends on the
amount of memory in your printer, the size of the other link buffers, and
whether Resource Save is set to On or Off. To maximize the range for the
Serial Buffer size, disable or reduce the size of the parallel, infrared, LocalTalk,
and USB buffers.
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