Hertz Monkey

Hello Everyone; I am using a Rockwell drive PowerFlex 700. I want to replace the standard HMI with the PanelView. I am using a communications module 20-COMM-M to interface between the drive and the HMI, they communicate using modbus which is transfered by ethernet protocol . I got the latest firmware for both the drive & the HMI, loaded the application file but there seems to be a problem with the communication between them. The drive parameter values are all displayed as ********* and they cannot be changed. I've checked all my cables and replaced them, I am using a crossover ethernet cable between the HMI and the 20-COMM-M (Modbus communication using ethernet protocol) and then the COMM-M is connected to the drive through its DPI port. I've tried tweaking the IP addresses and the subnet mask. I have the subnet mask for both set at 255.255.255.0 and the IP addresses at 192.168.20.1 & 192.168.20.2 for Panelview and the COMM-M still the problem persists. The COMM-M seems to be connected with the drive because I can see it on Drive explorer but I don't know if it is with Panelview. Any ideas?