8 files changed, 11 insertions, 12 deletions
diff --git a/src/plugins/canbus/passthrucan/passthrucan.pro b/src/plugins/canbus/passthrucan/passthrucan.pro
index 96ed090..cb9bdc5 100644
--- a/src/plugins/canbus/passthrucan/passthrucan.pro
+++ b/src/plugins/canbus/passthrucan/passthrucan.pro
@@ -16,6 +16,5 @@ HEADERS += \
 DISTFILES = plugin.json
 
 PLUGIN_TYPE = canbus
-PLUGIN_EXTENDS = serialbus
 PLUGIN_CLASS_NAME = PassThruCanBusPlugin
 load(qt_plugin)
diff --git a/src/plugins/canbus/peakcan/peakcan.pro b/src/plugins/canbus/peakcan/peakcan.pro
index 9f9a2de..d5b809c 100644
--- a/src/plugins/canbus/peakcan/peakcan.pro
+++ b/src/plugins/canbus/peakcan/peakcan.pro
@@ -14,6 +14,5 @@ SOURCES += \
 DISTFILES = plugin.json
 
 PLUGIN_TYPE = canbus
-PLUGIN_EXTENDS = serialbus
 PLUGIN_CLASS_NAME = PeakCanBusPlugin
 load(qt_plugin)
diff --git a/src/plugins/canbus/socketcan/socketcan.pro b/src/plugins/canbus/socketcan/socketcan.pro
index a4874b0..20a2c5d 100644
--- a/src/plugins/canbus/socketcan/socketcan.pro
+++ b/src/plugins/canbus/socketcan/socketcan.pro
@@ -12,6 +12,5 @@ SOURCES += \
 DISTFILES = plugin.json
 
 PLUGIN_TYPE = canbus
-PLUGIN_EXTENDS = serialbus
 PLUGIN_CLASS_NAME = SocketCanBusPlugin
 load(qt_plugin)
diff --git a/src/plugins/canbus/systeccan/systeccan.pro b/src/plugins/canbus/systeccan/systeccan.pro
index f1c2180..3520325 100644
--- a/src/plugins/canbus/systeccan/systeccan.pro
+++ b/src/plugins/canbus/systeccan/systeccan.pro
@@ -14,6 +14,5 @@ SOURCES += \
 DISTFILES = plugin.json
 
 PLUGIN_TYPE = canbus
-PLUGIN_EXTENDS = serialbus
 PLUGIN_CLASS_NAME = SystecCanBusPlugin
 load(qt_plugin)
diff --git a/src/plugins/canbus/tinycan/tinycan.pro b/src/plugins/canbus/tinycan/tinycan.pro
index c0aa948..c450bb9 100644
--- a/src/plugins/canbus/tinycan/tinycan.pro
+++ b/src/plugins/canbus/tinycan/tinycan.pro
@@ -13,6 +13,5 @@ SOURCES += main.cpp \
 DISTFILES = plugin.json
 
 PLUGIN_TYPE = canbus
-PLUGIN_EXTENDS = serialbus
 PLUGIN_CLASS_NAME = TinyCanBusPlugin
 load(qt_plugin)
diff --git a/src/plugins/canbus/vectorcan/vectorcan.pro b/src/plugins/canbus/vectorcan/vectorcan.pro
index b22492b..847f2aa 100644
--- a/src/plugins/canbus/vectorcan/vectorcan.pro
+++ b/src/plugins/canbus/vectorcan/vectorcan.pro
@@ -14,6 +14,5 @@ SOURCES += \
 DISTFILES = plugin.json
 
 PLUGIN_TYPE = canbus
-PLUGIN_EXTENDS = serialbus
 PLUGIN_CLASS_NAME = VectorCanBusPlugin
 load(qt_plugin)
diff --git a/src/plugins/canbus/virtualcan/virtualcan.pro b/src/plugins/canbus/virtualcan/virtualcan.pro
index 7b5504d..d719f70 100644
--- a/src/plugins/canbus/virtualcan/virtualcan.pro
+++ b/src/plugins/canbus/virtualcan/virtualcan.pro
@@ -12,6 +12,5 @@ SOURCES += \
 DISTFILES = plugin.json
 
 PLUGIN_TYPE = canbus
-PLUGIN_EXTENDS = serialbus
 PLUGIN_CLASS_NAME = VirtualCanBusPlugin
 load(qt_plugin)
diff --git a/src/serialbus/qmodbusdevice.cpp b/src/serialbus/qmodbusdevice.cpp
index 7ef358c..aa1bddc 100644
--- a/src/serialbus/qmodbusdevice.cpp
+++ b/src/serialbus/qmodbusdevice.cpp
@@ -228,10 +228,14 @@ void QModbusDevice::setConnectionParameter(int parameter, const QVariant &value)
 */
 
 /*!
-    Connects the device to the Modbus network. Returns \c true on success;
-    otherwise \c false.
+    Connects the device to the Modbus network. Returns \c true if the connection
+    process was successfully initiated; otherwise \c false. Final connection
+    success confirmation requires the \l state() changing to \l QModbusDevice::ConnectedState.
+
 
     This function calls \l open() as part of its implementation.
+
+    \sa open()
 */
 bool QModbusDevice::connectDevice()
 {
@@ -333,11 +337,13 @@ QString QModbusDevice::errorString() const
 
     This function is called by connectDevice(). Subclasses must provide
     an implementation that returns \c true on successful Modbus connection
-    or \c false otherwise.
+    or connection initiation; otherwise returns \c false.
 
     The implementation must ensure that the instance's \l state()
-    is set to \l QModbusDevice::ConnectedState upon success; otherwise
-    \l QModbusDevice::UnconnectedState.
+    is set to \l QModbusDevice::ConnectingState or \l QModbusDevice::ConnectedState upon success; otherwise
+    \l QModbusDevice::UnconnectedState. Typically, \l QModbusDevice::ConnectingState is used
+    when the connection process reports back asynchronously and \l QModbusDevice::ConnectedState
+    in case of synchronous connect behavior.
 
     \sa connectDevice()
 */