One last board to show off.
32Khz RTC crystal
4 - 24Vdc, 100mA Sinking Outputs
4 - 24Vdc inputs
2 - 0-10Vdc inputs (voltage divider)
1 - RS485 with SPI UART
I hope the RS485 UART works. I haven’t written the driver yet to test it. I am using the MAX3107 SPI UART with 128-word FIFO. http://www.maximintegrated.com/en/products/interface/controllers-expanders/MAX3107.html
If anyone has any experience with it and want to pass along any pointers I would appreciate it.