diff --git a/Cargo.toml b/Cargo.toml
index 42f727f5..cc4f6bae 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "zproto"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Stephen Hunt <stphnhnt.git@gmail.com>"]
 edition = "2021"
 description = "A library from communicating with Zaber products in Rust."
diff --git a/README.md b/README.md
index befef114..c91b0454 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Add this to your `Cargo.toml:
 
 ```toml
 [dependencies]
-zproto = "0.3.0"
+zproto = "0.3.1"
 ```
 
 ## Getting started
@@ -66,7 +66,7 @@ By default, both the ASCII and Binary protocols are enabled via the `ascii` and
 
 ```toml
 [dependencies]
-zproto = { version = "0.3.0", default-features = false, features = ["ascii"] }
+zproto = { version = "0.3.1", default-features = false, features = ["ascii"] }
 ```
 
 This will only include portions of the library related to the ASCII protocol
diff --git a/src/error.rs b/src/error.rs
index 29cf007b..04be601f 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -70,12 +70,31 @@ macro_rules! impl_error_display {
 
 #[cfg(any(feature = "ascii", feature = "binary"))]
 macro_rules! impl_is_timeout {
+    ($name:ident) => {
+        paste::paste! {
+            impl $name {
+                /// A convenience function for determining if the error is due to the
+                /// port timing out.
+                ///
+                /// Note that a timeout error is a kind of IO error, so [`is_io`][1] will
+                /// also return true for timeout errors.
+                ///
+                #[doc = "[1]: " $name "::is_io"]
+                pub fn is_timeout(&self) -> bool {
+                    matches!(self, $name::Io(e) if e.kind() == std::io::ErrorKind::TimedOut)
+                }
+            }
+        }
+    };
+}
+
+#[cfg(any(feature = "ascii", feature = "binary"))]
+macro_rules! impl_is_io {
     ($name:ident) => {
         impl $name {
-            /// A convenience function for determining if the error is due to the
-            /// port timing out.
-            pub fn is_timeout(&self) -> bool {
-                matches!(self, $name::Io(e) if e.kind() == std::io::ErrorKind::TimedOut)
+            /// A convenience function for determining if the error is an IO error.
+            pub fn is_io(&self) -> bool {
+                matches!(self, $name::Io(_))
             }
         }
     };
diff --git a/src/error/all.rs b/src/error/all.rs
index ef2c5370..2c518911 100644
--- a/src/error/all.rs
+++ b/src/error/all.rs
@@ -69,6 +69,7 @@ error_enum! {
     }
 }
 impl_is_timeout! { Error }
+impl_is_io! { Error }
 impl_from_serialport_error! { Error }
 impl_from_ascii_check_error! {
     Error {
diff --git a/src/error/ascii.rs b/src/error/ascii.rs
index 26eaec34..8849bbba 100644
--- a/src/error/ascii.rs
+++ b/src/error/ascii.rs
@@ -495,6 +495,7 @@ error_enum! {
     }
 }
 impl_is_timeout! { AsciiError }
+impl_is_io! { AsciiError }
 impl_from_serialport_error! { AsciiError }
 impl_from_ascii_check_error! {
     AsciiError {
diff --git a/src/error/binary.rs b/src/error/binary.rs
index bf51adc5..459ab419 100644
--- a/src/error/binary.rs
+++ b/src/error/binary.rs
@@ -124,6 +124,7 @@ error_enum! {
     }
 }
 impl_is_timeout! { BinaryError }
+impl_is_io! { BinaryError }
 impl_from_serialport_error! { BinaryError }
 
 macro_rules! define_error_codes {