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P112 is a general purpose GPIO board based on PIC16F873 micro-controller.

The board provides twelve GPIO circuits that can be configured either as input or output depending of the component mounted. Inputs are opto isolated, outputs are reed relay contact closures.

The board also provides a serial port with a RS485/422 driver. This may be useful if you plan to connect more that one P112 boards in a RS485 bus, or a single board controlled by a computer via RS422.

To help you in the development of your Firmware, a "framework" is provided. This is an skeleton program written in assembly that takes care of GPI reading and de-bouncing, interrupts handling and more, so you can focus on your application-specific code. See section "Firmware" for details.

An "ICSP" connector (In-Chip-Self-Programming) is available in the board to upload your object code to the MCU memory.

A system providing user-programmable Logic between general purpose inputs (GPI) and outputs (GPO).

Located at rack 20, this device allows for manually switching of ASI signals from Microwave or Fiber to our six TSL Decoders located at rack 19.

This manual is under construction and consequently incomplete. It will be completed as time permits and the system itself continues to develop.