With gas prices the way they are, a service call to Michigan could cost a pretty penny, let's see if we can walk you though this...
I don't like to assume anything, but for this I will assume that you have used the correct MUX cable between the NT-GRX-4S Wallstation and the GRX and that the connections were made according to the instructions in the Installation Guides...
It sounds like your issues revolve around addressing your Wallstation and getting it to communicate to the GRX.
Here is the description for how to accomplish this in straightforward language:Step One: Address the Wallstation
If the dipswitches 1-4 on the NT-GRX-4S are all up, that means you are addressing that wall control as "location #1". If you only have one wallstation, then this is what you want.(If you have multiple wallstations connected to the GRX, assign them each their own location number by referencing the dipswitch settings on page 4 of the GRX Wallstation Installation Guide)http://www.lutron.com/instructions/030814a.pdf
.Step Two: Address the GRX
Put the GRX into setup mode by pressing the "Scene 1" and "Off" buttons simultaneously for 3-4 seconds.
Flip up the cover and scroll through the Setup modes with the arrows in the FADE box, watching the readout on the LED window which is also in the FADE box.
Once it reads "A-", you are at the Address menu. (if it reads Sd, Sc, LS, or LC, keep scrolling up or down with the FADE arows)
To take it out of default A- mode ad assign and dedicated address, press the "master up" arrow button which is just to the right of the LED display to set it to A1, A2, A3, etc. (do NOT press the the FADE arrow buttons directly below the LED display, as you will be scrolling through Setup options again)
Take the GRX out of setup mode by pressing the same combination you used to put it into setup mode.Step Three: Initialize Communication between the GRX and the Wallstation(s)
Now, go to the NT-RX and put it into "talk" mode by pressing the scene 1 ad scene 4 buttons simultaneously for 3-4 seconds.
When it is in "Talk" mode, press the scene 1 button on the GRX (make sure the GRX is NOT in setup mode before you start this process)
Pressing the Scene 1 button tells the GRX to "Listen" to the Wallstation(s) that are in "Talk" mode at that time.
Take the NT-GRX-4S out of "Talk" mode using the same button press combination you used to put it into "Talk" mode.Setting the scenes for the Wallstation to control
If dipswitches 5 and 6 on the NT-GRX-4S are both up, then your NT-GRX-4S will mimic the front panel buttons on the GRX and they will both control Scenes 1-4 that you have programmed into the GRX.(If you have more scenes programmed in the GRX, and you would like the NT-GRX-4S to control Scenes 5-8, 9-12, or 13-16 instead of 1-4, then you can adjust the dipswitch settings according to the chart at the top of page 5 of the Grafik Eye Wallstation Installation Guide.
You are done.