Dymo LabelWriter 450 Duo Label Printer User Manual download pdf (Page 11)

Bit 1 (Top-of-Form)

This bit is returned as a 1 if the printer is in top-of-form position. Otherwise, this bit is returned

as a 0.

Bit 2 (reserved)

Bit 3 (reserved)

Bit 4 (reserved)

Bit 5 (Out of Paper)

This bit is returned as a 1 if the printer is out of paper. Otherwise, this bit is returned as a 0.

Bit 6 (Paper Jam)

Bit 7 (Error)

This bit is also sent when an out of paper condition is detected.

Optimization of Throughput

To achieve optimal performance, the data transfer from the host to the printer should be kept as

short as possible. The communication protocol was designed to allow the data to be transferred

with only one overhead byte per dot line. Command sequences, such as Set Dot Tabs or Set

Bytes per Line, should be sent only when a change is desired. The Dot Tab and Bytes per Line

commands should be used to reduce the number of bytes transmitted. The Form Feed command

should be used after transmitting the last dot line to be printed.

Self-Test Capability

The printers include a self-test capability in the form of canned print patterns. To activate the

self-test, press the form-feed button and hold it down for approximately 10 seconds. The self-

test will start printing a repeating series of test patterns. To stop the self-test, press the form-feed

button a second time.

Barcode and Graphics Print Mode

For better accuracy of dot placement and sizing, the LabelWriter 450 series printers incorporate

a feature which allows the host computer to specify a 300 x 600 dpi Barcode and Graphics print

mode. In Barcode and Graphics mode, the printer steps half as far when printing each dot line

than it does in 300 x 300 dpi Text mode. This creates smaller, more precise dots for better

image quality. Print quality is also improved by a reduction in print speed which provides

smooth and even printing, resulting in greater regularity of dot darkness and size. This mode

may improve print quality of smaller barcodes and some graphic images.

Low Power Mode

The LabelWriter 450 series includes an automatic power saving feature. After 30 seconds of

inactivity the printer will shut down its unused internal peripherals and dim its LED. Pressing

the feed button while the printer is in this state will cause it to resume normal operation rather

than feeding a label. If print data is sent to the printer while it is in Low Power mode it will

automatically resume full operation.

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Dymo LabelWriter 450 Duo Label Printer User Manual Page 11