Digi PortServer with Motorola MOSCAD PLC

Hi. I’ve been trying to access data via the Digi PortServer from a Motorola MOSCAD PLC (FLN2414A). The protocol that is used by Motorola is MDLC. I have an MDLC Gateway driver from Wonderware and have configured the Digi to use the Industrial Automation Profile but I am unable to successfully connect through. I can connect to the PLC using RS-232 serial to my computer. Is there a specific port I need to go through?