Join Date: Feb 2011
Location: San Francisco Bay area
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Re: SH Ggxx 2150 AIS Matrix+
Possibly, but the 2150 is not one of them. No good can come of connecting inverting inputs and outputs to ground.
Did your combinations include : ground to ground, out + to in +, and in + to out +? Because if you never connected ground to ground, that is why it never worked.
I just took a look at the MA500 installation manual, and on page 37 there is a list of pins on the connector.
It mentions GND on pin 1, then - and + outputs. A common misconception is that the minuses are grounds. At least on my GX2150, they are inverting inputs/outputs.
So connect pin 1 (ground) to the plotter ground. (might be a wire, might be the cable sheath)
Then connect plus to plus, both ways : plotter o/p + to MA500 in +, and plotter input + to MA500 out +. Simple.
I've had to work through all these issues myself when I first connected up my GX2150. I ended up consulting a highly expert electronics engineer. What SH have done is provided two separate inverting and non-inverting, labelled - and +, inputs and outputs. In this case the - ones are simply left unused. It is NOT a bipolar or balanced input, when grounding one or adding a capacitor would otherwise help.
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