Microsoft KB Archive/69417

PRB: Print Manager Puts Epson LQ850 in Unidirectional Mode PSS ID Number: Q69417 Article last modified on 08-13-1991 PSS database name: O_Os2SDK

1.21 1.30

OS/2

Summary:

SYMPTOMS When using OS/2 version 1.21 and the OS/2 Print Manager, the Epson LQ850 printer is always put into unidirectional mode even though it supports bidirectional printing,

CAUSE The Presentation Manager (PM) driver initializes the printer when OS/2 first boots up. PM requires unidirectional printing for the proper printout of graphics. By design, the Epson LQ850 PM printer driver only supports unidirectional mode.

RESOLUTION To turn off unidirectional printing (that is, turn on bidirectional printing) for non-PM applications, the printer must be sent the following escape sequence just before the non-PM output is printed:

U0 /* This turns off the unidirectional mode. */

The Epson LQ850 printer can be put back into unidirectional mode by using the following setting for applications that do not use the PM printer driver. This involves sending the printer the following escape sequence:

U1 /* This turns on the unidirectional mode. */

Copyright Microsoft Corporation 1991.