Have you checked in the Control Builder's OnLine Help (typically the first place I look when programming the 800M)?
Seem to me like a legacy (obsolete?) function used to print text to a locally connected serial printer. I find it briefly mentioned in various release documents of the System Baseline 2 era, but less (not?) in the present version.
Need to speak with the world outside of the AC 800M w/o going via OPC?
Have you checked the UDP / TCP libraries with which you can implement custom communication stacks?
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