ES128 to/from VHF DSC via NMEA

I would like to verify the connection of a ES128 MFD to a Icom M412 VIA NMEA wiring. It is connected as follows:

Icom MFD

NMEA in - (shield) to Brown output -
NMEA in +(red) to Yellow output +
NMEA out-(shield) to Green input -
NMEA out+(white) to White input +

NMEA port is set to 1 on MFD

I was offshore this weekend when a DSC alert came accross and it did not display on the MFD, However, the VHF was only connected to receive data from the MFD (only yellow and brown were hooked up). I since hooked it up as stated above. Should this cure the problem?
The instructions I found on this forum noted a blue wire, the VHF has a blue wire and is labeled by Icom as a clone wire....