I-Stations will work with M+3 frames running software / firmware versions 2.3.7 or 2.4.0 or 2.4.1. The I-Station firmware version should match the software version to support proper station functionality.
Matrix +3 frames using software / firmware versions 2.3.0 or earlier will not allow the I-Station to connect at all. The I-Station keys will flash red constantly and display will read "INCOMPATIBLE FIRMWARE". In early PGM-WIN versions (2.3.0. or earlier) .The matrix ports menu has no i-station selection.