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This is the three axis display board I designed and built a few years back. It have configurable 32 bit counters that are software scalable to display alternate counts for different numbers of counts per inch. I.E. differing resolution of encoders. The three lines are for display of 'X', 'Y', & 'Z' respectively. The rows of buttons along side of each display controls the operation mode. The button row to the left selects absolute or relative mode, while the button on the right side clears the current mode (abs or rel).

I used five pin din connectors for connection to the linear encoders. At the time it seamed like a good idea, but since they've been plugged in and unplugged about 100 times the soft plastic housing is starting to break down. Next time I'll stick with a crimped and pined 9-pin D-Sub solution.

The power supply is an off the shelf solution I picked up at a surplus store. It turns out that it's incredibly susceptible to noise and since this device is operation off the same AC line as the 2&1/2 Hp motor in the mill, I went ahead and put in an AC line filter.

The first versions of this I built had an older static 8031 core. The later versions have an 80C320 from Dallas Semiconductor. This allows the three sets of real time floating point calculations to operate seamlessly and gets rid of the flicker during refresh.

Lower right, (3x) blue wire five pin connections facilitate electrical conductivity between the DIN-5's on the case and the PCB. The second oscillator visible in the lower left is for clocking the high speed 32 bit counting function in the CPLD.