======================
 Arduino Uno and Nano
======================


Connection
==========

These connections are required between the Arduino UNO/Nano and the IEEE488 connector:

======= ================= ========
Arduino GPIB connector    Function
======= ================= ========
A0      1                 DIO1
A1      2                 DIO2
A2      3                 DIO3
A3      4                 DIO4
D12     5                 EOI
D11     6                 DAV
D10     7                 NRFD
D9      8                 NDAC
D8      9                 IFC
D2      10                SRQ
D7      11                ATN
GND     12                Shield
A4      13                DIO5
A5      14                DIO6
D4      15                DIO7
D5      16                DIO8
D3      17                REN
GND     18,19,20,21,22,23 GND
======= ================= ========

Wiring diagram
--------------

.. image:: /_static/wiring_uno.png

When using SN75160 and SN75161 integrated circuits, the connections involve at least one
extra pin to control the talk-enable (``TE``) pin of the IC. The ``PE`` pin on the
SN75160 is connected to VCC to maintain a 3-state outputs when ``TE`` is high.
Connecting ``PE`` to ground will allow the outputs to function in pullup-enable mode
when ``TE`` is high.

On the SN75161, the ``DC`` pin can be connected to a separate GPIO pin on the Uno/Nano,
or, since ren is always asserted when in controller mode and de-asserted in device mode,
to the GPIO pin used for the ``REN`` signal.

.. image:: /_static/wiring_uno_sn7516x.png