Perle Systems 5500152-23 manual Problems with printer output, The printcap.spd configuration file

Problems with printer output

When you use transparent printing you may obtain incorrect printer output due to the following reasons:

Graphics printers may misinterpret some characters output through transparent print. This problem is more likely if the terminal is in 7-bit mode, because 8-bit characters will not be printed.

Some terminals suppress the output of certain characters to their printer or AUX ports. Such terminals can prevent essential control characters from reaching the printer thus generating incorrect printer output. This occurrence is extremely unpredictable because of the large number of potential hardware configurations.

The printcap.spd configuration file

The printcap.spd file defines the transparent print ON and OFF strings for each terminal type available. When a host card receives data addressed to the transparent print device it prefixes it with the transparent print mode ON string and appends it with the transparent mode OFF string.

Terminal type.

ansi ^X ^T

Transparent print OFF

Transparent print ON string.

If you don’t configure a specific terminal type printcap.spd will use the default type which is “unknown”

UltraPort Serial Adaptors User Guide

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