My GX2150 and e7 manuals show the following:
e7 MFD Port 1:
white: Input +, green: Input -, yellow: Output +, Brown: Output -
GX2150 (No GPS in radio):
green: NEMA Common ground/-, blue: GPS input +, grey: DSC output +, brown: AIS output +
GX2150 manual says if using one MFD NMEA port, then set up MFD at 38400 baud I/O to send GPS to GX2150 using blue wire and receive AIS/DSC from GX2150 using grey wire. GX2150 Brown not used. So looks like 2150 sends both DSC + AIS over grey wire.
So e7 to GX2150 wiring diagram will be:
e7 GX2150
white (I+) grey (O+)
green (I-) green (O-)
yellow (O+) blue (I+)
brown (O-) green (I-)
Leslie/Rob- Look OK?