Any device that supports MMC can be controlled directly from within Pro Tools, with either the device or Pro Tools acting as clock master.
The external devices supported by Pro Tools implement “open loop” communications only. Because of this, while Pro Tools is the Transport Master, any direct operation of the receiving device’s transport will not be communicated back to Pro Tools. Instead, you can use the Transport pop-up to select the external device (MMC in the pop-up) and use the Pro Tools on-screen transport controls to drive the device.
Pro Tools does not support remote track arming of MMC-controlled external devices. You need to manually arm tracks for recording on the external device.