====== OpenLogger Screw Terminal Adapter ======
The OpenLogger Screw Terminal Adapter is intended to be used with the Digilent OpenLogger to provide external connections to the OpenLogger via screw terminal adapters for more readily accessible inputs. The Screw Terminal Adapter connects directly on top of the OpenLogger to maintain a small form factor.


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/*
== Download This Reference Manual ==
  * {{:reference:test-and-measurement:discovery_bnc_adapter:discovery_bnc_adapater_rm.pdf|Discovery BNC Adapater }}
*/

==== Features ====
  * Standard Screw Terminal Adapters for easy connectivity
  * Designed to fit directly on top of the OpenLogger

==== Physical Dimensions ====
The long side of the Screw Terminal Adapter for the Openlogger is 2.838 inches (72.1 mm) and the short side of the PCB is 2.2835 inches (58 mm) in length. 

===== Functional Description =====
The OpenLogger Screw Terminal Adapter provides screw terminals for each analog input and each digital pin, with an analog ground pin to pair with each analog input. A screw terminal pair for the 5V power supply from the OpenLogger is available in the center of the board as well as additional headers for access to a few of the OpenLogger specific pins.

/*The Discovery BNC adapter board has BNC terminations to each of the two oscilloscope channels on the Analog Discovery. Each channel of the oscilloscope can be selected as AC or DC coupled by adjusting the jumper that is located behind that channel's BNC input connector. Note that the negative inputs for both oscilloscope channels are tied to ground, creating single ended inputs with the BNC Adapter board. 

The two AWG channels are equipped with BNC terminations for use with BNC style test leads. Each of the two channels can have either the 50Ω or the 0Ω termination selected. This enables the user to match the Analog Discovery's output impedance with either standard 50-ohm test leads or to be directly tied to the lead.

All the remaining signals from the Analog Discovery pass through the adapter to a female header located on the outer edge of the board.*/

===== Pinout Diagram =====

|< 100% 12.5% 12.5% 12.5% 12.5% 12.5% 12.5% 12.5% 12.5%>|
^  Primary connector             ^^^^  West Screw Terminals      ^^ North Screw Terminals  ^^
| 1  | GPIO3  | 2  | GPIO7          | DC2  | DC Output 2          | DIO0  | GPIO 0  |
| 3  | GPIO2  | 4  | GPIO6          | GND  | Digital Ground       | DIO1  | GPIO 1  |
| 5  | GPIO1  | 6  | GPIO5          | DC1  | DC Output 1          | DIO2  | GPIO 2  |
| 7  | GPIO0  | 8  | GPIO4          | WGEN  | Waveform Generator  | DIO3  | GPIO 3  |
| 9  | DC 2  | 10  | GND            | AI8+  | Analog Input 8      | DIO4  | GPIO 4  |
| 11  | DC 1  | 12  | GND           | AGND  | Analog Ground       | DIO5  | GPIO 5  |
| 13  | Wavegen  | 14  | GND        | AI7+  | Analog Input 7      | DIO6  | GPIO 6  |
| 15  | Reserved  | 16  | Reserved  | AI6+  | Analog Input 6      | DIO7  | GPIO 7  |
| 17  | Reset  | 18  | PROG         ^  South Screw Terminals     ^^  Center Screw Terminals  ^^
| 19  | +5V  | 20  | GND            | AGND  | Analog Ground       | 5V  | 5V Output  |
| 21  | AI8+  | 22  | AGND8         | AI5+  | Analog Input 5      | GND  | Digital Ground  |
| 23  | AI7+  | 24  | AGND7         | AI4+  | Analog Input 4      ^  Center Pin Headers  ^^
| 25  | AI6+  | 26  | AGND6         | AGND  | Analog Ground       | TRG OUT  | Trigger Output (unused)  |
| 27  | AI5+  | 28  | AGND5         | AI3+  | Analog Input 3      | TRG IN  | Trigger Input (unused)  |
| 29*  | AI4+  | 30  | AGND4        | AI2+  | Analog Input 2      | PROG BTN  | Program Button  |
| 31*  | AI3+  | 32  | AGND3        | AGND  | Analog Ground       | RESET BTN  | Reset Button  |
| 33  | AI2+  | 34  | AGND2         | AI1+  | Analog Input 1      | GND  | Digital Ground  |
| 35  | AI1+  | 36  | AGND1         | ||||

*Note -- pin 29 is mislabeled as pin 31 on the silkscreen in Rev A of the Screw Terminal Adapter


{{tag>openlogger doc}}