This post list the figures which show MB EIS Test Platform connectoion for all of compatible Mercedes Benz models including W164 W221 connection, W210 W208 W202 connection, W209 W211 W169 connection, W639 W203 connection and W204 w207 connection.
Figure one: W164 W221 connection
W210 W208 W202 connection
W209 W211 W169 connection
W639 W203 connection
W204 w207 connection: this one need to connect with car’s ESL for test
This is from CarDiag – Professional Car Diagnostic Tool Online Shop technical support: MB EIS Test Platform connection diagram for different Mercedes