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IPDS Resolution (600 DPI Only)

Selecting IPDS(TM) resolution

Printer Definition -> Printer -> Basic -> IPDS Resolution

With a 480/600 switchable printhead switched to 600 DPI(R) resolution, the operator is able to select an intelligent printer data stream (IPDS) resolution. The choices are:

The operator selects an option from this screen. The printer reports the option selected to PSF.

240 DPI and 300 DPI IPDS Resolution Mode

When the printer is set in 240 DPI IPDS resolution mode, it reports to PSF that it is a 240 DPI printer. PSF can then send 240 DPI raster fonts to the printer without receiving an error. The printer automatically scales the 240 DPI raster fonts (and all other resources) to 600 DPI for printing. When the printer is set in 300 DPI IPDS resolution mode, it reports to PSF that it is a 300 DPI printer. PSF can then send 300 DPI fonts to the printer without receiving an error. Operational considerations for switching between 240 and 300 DPI IPDS resolution modes are the same as those for switching between 480 and 600 DPI as discussed in 480/600 Switchable Resolution.

However, unlike a 240/300 DPI switchable printer, the print resolution is actually 600 DPI. Applications using outline fonts can take full advantage of the 600 DPI resolution in either mode. The printer renders the outlines at full 600 DPI resolution.

Note that when the printer has both a 480 DPI printhead and a 600 DPI printhead, it is generally preferable to print 240 DPI jobs using the 480 DPI. See 480/600 Switchable Resolution.

600 DPI IPDS Resolution Mode

When the printer is set in 600 DPI IPDS resolution mode, it reports to PSF that it is a 600 DPI printer. PSF does not send 240 or 300 DPI raster fonts to the printer. It sends outline fonts only. Although technically the printer could accept 600 DPI raster fonts, IBM(R) does not supply 600 DPI raster font and does not encourage you to use 600 DPI raster fonts. At 600 DPI, outline fonts are the recommended font technology.

Note that setting the printer in 600 DPI IPDS resolution mode does not provide any benefit over either 240 or 300 DPI IPDS resolution mode. In all cases, the resolution at which the data is printed is 600 DPI. Also in all cases, outline fonts are accepted and rendered at 600 DPI. The only difference between a 600 DPI printer set in 240 DPI IPDS resolution mode or in 600 DPI IPDS mode is that when the printer is in 600 DPI IPDS resolution mode, it cannot receive and print 240 DPI raster fonts.

Automatic IPDS Resolution Mode

The final IPDS resolution mode is "Automatic". When a 600 DPI printer is in Automatic IPDS resolution mode, the printer reports to PSF that it is capable of accepting any font resolution. This allows PSF to send 240 DPI raster fonts, 300 DPI raster fonts, or outline fonts to the printer without requiring the operator to change any printer configuration options on the touchscreen. Jobs needing 240 DPI fonts can be intermixed with those needing 300 DPI fonts.

Using automatic mode can simplify operating procedures for enterprises with jobs requiring resource resolutions. However, with a 480/600 switchable printhead, you need to weigh this advantage against possible improvements in throughput and print clarity of 480 DPI for jobs formatted using 240 DPI resources. See 480/600 Switchable Resolution.

Note:
Automatic IPDS resolution mode requires updates to PSF to enable it to respond to and take advantage of this printer capability. Do not select this mode unless you have PSF capable of Multiple Resolution support. PSF/MVS 2.2 with APAR OW27622 has this support. See the APAR documentation for details.