087 is a Buffer Overflow. It means the PC has sent more than 10 characters after the NC has sent the XOFF. Try turning off the FIFO buffers on your COM port. Go to Control Panel, System, Hardware, Device Manager, Ports, and right click on the COM port you are using. Click Properties, go to the Port Settings tab, click Advanced.
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087 is a Buffer Overflow. It means the PC has sent more than 10 characters after the NC has sent the XOFF. Try turning off the FIFO buffers on your COM port. Go to Control Panel, System, Hardware, Device Manager, Ports, and right click on the COM port you are using. Click Properties, go to the Port Settings tab, click Advanced.
I'm not so sure that 087 is an exact alarm. I think it merely means that something is wrong.
I can download the parameter file which is very long with 3 wires, no hand shaking without a problem.
I can then send a 10 line program and get an error.
In my case, I was either writing to the 9000+ area of my program, which I hadn't enabled or the format of the file was wrong.
Take 087 with a pinch of salt, not only buffer overflow..