Originally Posted by moisheh
Can the 210 controller be used in place of the 209?
Yes, the 210 is a direct replacement for the 209. It has a higher amp draw capacity through the relays and possibly larger traces on the circuit board.
QUOTE from the IMMI (VIP) Website: "The SM209 controller has been superseded by the SM210 controller. Any revision SM210 can be used to replace an SM209. They are plug compatible and no changes are required to make the substitution."