Add note about DTR behavior on linux

serialport · Jan 22, 2025 · ec256f0 · ec256f0
1 parent a71198e
commit ec256f0
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/lib.rs b/src/lib.rs
@@ -396,6 +396,10 @@ impl SerialPortBuilder {
     }
 
     /// Set data terminal ready (DTR) to the given state when opening the device
+    ///
+    /// Note: On Linux, DTR is automatically set on open. Even if you set `dtr_on_open` to false,
+    /// DTR will be asserted for a short moment when opening the port. This can't be prevented
+    /// without kernel modifications.
     #[must_use]
     pub fn dtr_on_open(mut self, state: bool) -> Self {
         self.dtr_on_open = Some(state);