As far as I know, ALDL (Assembly Line Diagnostic Link) was developed by General Motors. I do not believe Mercedes implemented it on the W140. I believe Mercedes equipped the cars with ODB2 in 1996.
Check out these links, they will give you lots of information on the diagnostic systems Mercedes built into the W140:
http://www.w124performance.com/docs/mb/diagnostics/DTC_List_W140_M119_1992-95.pdf
http://www.mbcluster.com/Media_Diagnostics.htm
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