Add an I/O connector overview to the documentation

doc/architecture/script_command_interface.rst

@@ -29,6 +29,8 @@ At the time of writing the ``ScriptCommandInterface`` provides the following fun
 - ``setToolVoltageT2()``: Set the tool voltage on connector T2. Requires PolyScope X 10.15.0 or later and Tool Flange
   V2, as reported by the RTDE robot properties. PolyScope 5 does not support connector T2.
 
+See :ref:`io_connectors` for what the tool connectors T0 and T2 are.
+
 Communication protocol
 ----------------------
 

doc/index.rst

@@ -15,6 +15,7 @@ can be found on `GitHub <https://github.com/UniversalRobots/Universal_Robots_Cli
 
    installation
    setup
+   io_connectors
    polyscope_compatibility
    architecture
    examples

doc/io_connectors.rst

@@ -0,0 +1,108 @@
+:github_url: https://github.com/UniversalRobots/Universal_Robots_Client_Library/blob/master/doc/io_connectors.rst
+
+.. _io_connectors:
+
+I/O connector overview
+======================
+
+This page gives a short overview of the I/O connectors on the tool flange and the control box, and
+which functions of this library act on them.
+
+- Starting with software versions 10.15 and 5.26, URScript addresses I/O through string labels such
+  as ``CB_CI0`` or ``T0_V`` (unified I/O).
+- A label that does not exist on the connected hardware raises a runtime exception in URScript.
+- The library reports the connected hardware as ``ControlBoxType`` (``CB5`` or ``CB7``) and
+  ``ToolFlangeType`` (``V1`` or ``V2``), available from the ``PrimaryClient`` and the
+  ``RTDEWriter``.
+- For the complete list of labels and the connector drawings, refer to the robot manual.
+
+Tool connectors
+---------------
+
+- **e-Series and UR-Series robots**: connector ``T0`` only. Reported as ``ToolFlangeType::V1``.
+- **g-Series robots**: connectors ``T0`` to ``T3``. Reported as ``ToolFlangeType::V2``.
+
+  - ``T0`` works the same as on e-Series and UR-Series robots.
+
+T0 -- M8 8-pin (CB3, e-Series, UR-Series and g-Series)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+- Digital inputs ``T0_CI0``, ``T0_CI1``, can be configured for Safe freedrive.
+- Digital outputs ``T0_DO0``, ``T0_DO1``.
+- Analog inputs ``T0_AI0``, ``T0_AI1``.
+- Tool power output ``T0_V``: 0, 12 or 24 V.
+- Library: ``setToolVoltage()``, ``RTDEWriter::sendToolDigitalOutput()`` with pins 0-1.
+
+T1 -- Smart Panel pogo-pin connector (g-Series only)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+- Digital inputs ``T1_DI0`` to ``T1_DI2``.
+- Digital inputs ``T1_CI0``, ``T1_CI1``, can be configured for Safe freedrive.
+- Digital outputs ``T1_DO0`` to ``T1_DO3``. ``T1_DO0`` is the Smart Panel LED.
+- ``T1_CONNECTED`` is true when a Smart Panel is connected and powered.
+- Library: ``RTDEWriter::sendToolDigitalOutput()`` with pins 2-5.
+
+T2 -- M8 4-pin (g-Series only)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+- Power output only, ``T2_V``: 0, 24 or 48 V.
+- Library: ``setToolVoltageT2()``, requires PolyScope X 10.15.0 or later.
+
+T3 -- Industrial Ethernet (g-Series only)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+- Ethernet connection to the tool.
+- No I/O or power labels.
+
+CB5 control box
+---------------
+
+- I/O:
+
+  - Digital inputs ``CB_DI0`` to ``CB_DI7``.
+  - Digital outputs ``CB_DO0`` to ``CB_DO7``.
+  - Configurable digital inputs ``CB_CI0`` to ``CB_CI7`` and outputs ``CB_CO0`` to ``CB_CO7``,
+    can be used for safety functions.
+  - Digital inputs ``CB_DI8`` to ``CB_DI11`` with high-speed encoder input functions.
+  - Analog inputs ``CB_AI0``, ``CB_AI1`` and analog outputs ``CB_AO0``, ``CB_AO1``.
+
+- External ports:
+
+  - One Ethernet port.
+  - Two USB-A ports.
+
+CB7 control box
+---------------
+
+- I/O:
+
+  - Configurable digital inputs ``CB_CI0`` to ``CB_CI15`` and outputs ``CB_CO0`` to ``CB_CO15``,
+    can be used for safety functions.
+  - No standard digital outputs.
+  - Digital inputs ``CB_DI0`` to ``CB_DI3`` with high-speed encoder input functions.
+  - Analog inputs ``CB_AI0``, ``CB_AI1`` and analog outputs ``CB_AO0``, ``CB_AO1``.
+
+- External ports:
+
+  - Three Ethernet ports.
+  - Two USB-C ports with DisplayPort output.
+  - Two USB-A ports.
+  - Five Ethernet ports in total, counting the end-of-arm and Teach Pendant connections.
+
+Configuration on the Teach Pendant
+----------------------------------
+
+- Network configuration of the Ethernet ports, such as routing and firewall settings.
+- Configuration of the configurable I/Os, for example whether one is used for a safety function.
+
+Control box library functions
+-----------------------------
+
+- ``RTDEWriter::sendStandardDigitalOutput()``: sets the standard digital outputs. Returns ``false``
+  on a CB7, which has none.
+- ``RTDEWriter::sendConfigurableDigitalOutput()``: sets the configurable digital outputs.
+
+  - Pins 0-7 with RTDE protocol versions below 3.
+  - Pins 0-15 with RTDE protocol version 3.
+
+- ``RTDEWriter::sendStandardAnalogOutput()``: sets the analog outputs 0-1.