add infos

doc/devices/magstim-bistim.rst

@@ -15,6 +15,39 @@ Magstim devices share common features that are detailed in the
     Contrary to the `Super Rapid² Plus¹`_, the `BiStim²`_ power consumption is handled
     through a single power outlet.
 
+Settings
+--------
+
+When both stimulators are connected to the same coil, the stimulator A controls the
+intensity of both pulses (and stimulators) and the inter-pulse interval. The pulses
+can be set to different intensities.
+
+Mode ε
+~~~~~~
+
+When setting the inter-pulse interval to ``0``, then pressing the red button and turning
+the nob counter-clockwise, the `BiStim²`_ will enter mode ε. In this mode, the pulse
+delivery is controlled by the triggers only. The first trigger will deliver a pulse on
+stimulator A, the second trigger will deliver a pulse on stimulator B.
+
+.. warning::
+
+    The `BiStim²`_ stimulators need time to recharge between pulses. Thus, after a pulse
+    has been delivered on a stimulator, it is up to the user to ensure no new trigger
+    attempts to deliver a pulse on the same stimulator before it is ready. Usually, the
+    stimulator requires around 1 second to recharge (depends on the pulse intensity).
+
+    If a trigger is sent to a stimulator that is not ready, the `BiStim²`_ will wait
+    until it is recharged before delivering the pulse. Thus, the inter-pulse interval
+    will **not** be respected.
+
+Notes
+-----
+
+Using both `BiStim²`_ stimulators connected to the same coil with an inter-pulse
+interval set to ``0`` is not equivalent to using a single `BiStim²`_ stimulator. This
+mode of operation is **not recommended**.
+
 Datasheet
 ---------
 

pyproject.toml

@@ -78,7 +78,7 @@ style = [
   'codespell[toml]>=2.2.4',
   'isort',
   'pydocstyle[toml]',
-  'ruff>=0.1.8',
+  'ruff>=0.4.0',
   'toml-sort',
   'yamllint',
 ]