Microcom 424M Operator's Manual page 29

Getting Started
The Detect Hardware button is used to read
settings from the printer.
When the Autodetect is enabled, the driver will
communicate to the printer and automatically set
the Internal Parameters section.
3-12
The Calculate SPG button is to manually
calculate the SPG which is a registration
parameter used by the printer.
The AutoCalc SPG will cause the printer
to automatically calculate the parameter.
324M/424M Operator's Manual - 880026-0144
Chapter 3