diff --git a/plugins/inputs/modbus/README.md b/plugins/inputs/modbus/README.md
index 6340672b6e13d..9f4cf5e37487c 100644
--- a/plugins/inputs/modbus/README.md
+++ b/plugins/inputs/modbus/README.md
@@ -9,7 +9,7 @@ Registers via Modbus TCP or Modbus RTU/ASCII.
 [[inputs.modbus]]
   ## Connection Configuration
   ##
-  ## The plugin supports connections to PLCs via MODBUS/TCP or
+  ## The plugin supports connections to PLCs via MODBUS/TCP, RTU over TCP, ASCII over TCP or
   ## via serial line communication in binary (RTU) or readable (ASCII) encoding
   ##
   ## Device name
@@ -29,15 +29,18 @@ Registers via Modbus TCP or Modbus RTU/ASCII.
 
   # TCP - connect via Modbus/TCP
   controller = "tcp://localhost:502"
-
+  
   ## Serial (RS485; RS232)
   # controller = "file:///dev/ttyUSB0"
   # baud_rate = 9600
   # data_bits = 8
   # parity = "N"
   # stop_bits = 1
-  # transmission_mode = "RTU"
 
+  ## For Modbus over TCP you can choose between "TCP", "RTUoverTCP" and "ASCIIoverTCP"
+  ## default behaviour is "TCP" if the controller is TCP
+  ## For Serial you can choose between "RTU" and "ASCII"
+  # transmission_mode = "RTU"
 
   ## Measurements
   ##
diff --git a/plugins/inputs/modbus/modbus.go b/plugins/inputs/modbus/modbus.go
index 8e1dc90027cf0..18a00e990dc66 100644
--- a/plugins/inputs/modbus/modbus.go
+++ b/plugins/inputs/modbus/modbus.go
@@ -68,7 +68,7 @@ const description = `Retrieve data from MODBUS slave devices`
 const sampleConfig = `
   ## Connection Configuration
   ##
-  ## The plugin supports connections to PLCs via MODBUS/TCP or
+  ## The plugin supports connections to PLCs via MODBUS/TCP, RTU over TCP, ASCII over TCP or
   ## via serial line communication in binary (RTU) or readable (ASCII) encoding
   ##
   ## Device name
@@ -88,16 +88,19 @@ const sampleConfig = `
 
   # TCP - connect via Modbus/TCP
   controller = "tcp://localhost:502"
-
+ 
   ## Serial (RS485; RS232)
   # controller = "file:///dev/ttyUSB0"
   # baud_rate = 9600
   # data_bits = 8
   # parity = "N"
   # stop_bits = 1
-  # transmission_mode = "RTU"
-
 
+  ## For Modbus over TCP you can choose between "TCP", "RTUoverTCP" and "ASCIIoverTCP"
+  ## default behaviour is "TCP" if the controller is TCP
+  ## For Serial you can choose between "RTU" and "ASCII"
+  # transmission_mode = "RTU"
+ 
   ## Measurements
   ##
 
@@ -246,9 +249,20 @@ func (m *Modbus) initClient() error {
 		if err != nil {
 			return err
 		}
-		handler := mb.NewTCPClientHandler(host + ":" + port)
-		handler.Timeout = time.Duration(m.Timeout)
-		m.handler = handler
+		switch m.TransmissionMode {
+		case "RTUoverTCP":
+			handler := mb.NewRTUOverTCPClientHandler(host + ":" + port)
+			handler.Timeout = time.Duration(m.Timeout)
+			m.handler = handler
+		case "ASCIIoverTCP":
+			handler := mb.NewASCIIOverTCPClientHandler(host + ":" + port)
+			handler.Timeout = time.Duration(m.Timeout)
+			m.handler = handler
+		default:
+			handler := mb.NewTCPClientHandler(host + ":" + port)
+			handler.Timeout = time.Duration(m.Timeout)
+			m.handler = handler
+		}
 	case "file":
 		switch m.TransmissionMode {
 		case "RTU":