I assume that you guys have to vary off and vary on various line
descriptions to get the switch to work ????

vary off SDLC(ecs) line
vary on async line

I haven't seen this solution described but this beats flipping 
the "dip" switches.

> For the 7852-400 modem the SETMDMASC('END') value on the Async line
> description will take care of switching from Sync to Async (and back
> to Sync when the line varies off).  We do this for PPP, and also for
> Fax, using the 7852.
> Depending on your OS/400 release level you may need a PTF to make this
> work correctly.
> MF21288 & SF57108 for V4R2; MF21674 & SF57540 for V4R3; SF56155 for
> V4R4
> Also see informational APAR II12085.
> PS - For V4R5 if you are using PPP with an answer profile you should
> also install SF64285 or your connection will fail.
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