… copied from the plugin sources.
#@BUILD_PLUGIN_MEMCACHEC_TRUE@LoadPlugin memcachec
#@BUILD_PLUGIN_MEMCACHED_TRUE@LoadPlugin memcached
@BUILD_PLUGIN_MEMORY_TRUE@@BUILD_PLUGIN_MEMORY_TRUE@LoadPlugin memory
+#@BUILD_PLUGIN_MODBUS_TRUE@LoadPlugin modbus
#@BUILD_PLUGIN_MULTIMETER_TRUE@LoadPlugin multimeter
#@BUILD_PLUGIN_MYSQL_TRUE@LoadPlugin mysql
#@BUILD_PLUGIN_NETAPP_TRUE@LoadPlugin netapp
# Port "11211"
#</Plugin>
+#<Plugin modbus>
+# <Data "data_name">
+# RegisterBase 1234
+# RegisterType float
+# Type gauge
+# Instance "..."
+# </Data>
+#
+# <Host "name">
+# Address "addr"
+# Port "1234"
+# Interval 60
+#
+# <Slave 1>
+# Instance "foobar" # optional
+# Collect "data_name"
+# </Slave>
+# </Host>
+#</Plugin>
+
#<Plugin mysql>
# <Database db_name>
# Host "database.serv.er"