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.

See also:

Serial Buffer

Purpose:

To configure the size of the serial input buffer.

Values:

Disabled

Disables the serial port.

Auto*

Printer automatically calculates the Serial Buffer size (recommended setting).

3K to maximum

User specifies the Serial Buffer size. The maximum size depends on the

size allowed

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.

Note: Changing the Serial Buffer menu item automatically resets the printer.

See also:

Resource Save

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IBM 1125, 1120 manual RS-422 Polarity, Serial Buffer, 162