R650

The flyer linked on this page covers ECM motor interface boards R600 and R650. It says the boards convert thermostat inputs and field-selectable CFM settings into signals used by the ECM motor. R600 features on the flyer are an ECM motor connector, a CFM LED that flashes once per 100 CFM, fan-speed selectable jumpers, CFM, delay, heat, and cool adjust settings, a dehumidification jumper and LED, a thermostat terminal block, and quick connects labeled R, C, EM, W1, O, Y2, Y1, and G.

The R650 section says the R650 has all of those features except the terminal block, and that it adds a W2 quick connect and LED, a HUM quick connect, and a field-selectable dehumidification jumper. This page identifies R650 as an ECM motor control and calls the linked file an ECM motor flyer. The flyer is the source for the connector, CFM indication, adjust settings, and the R650 differences from the R600 list.