diff --git a/cmd/root.go b/cmd/root.go
index 2db00aa..cb2bd08 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -17,9 +17,10 @@ package cmd
 
 import (
 	"fmt"
-	"github.com/spf13/cobra"
 	"os"
 
+	"github.com/spf13/cobra"
+
 	"github.com/spf13/viper"
 )
 
@@ -28,6 +29,7 @@ var (
 	device   string
 	baudrate int
 	bytesize byte
+	stopbits byte
 	lograw   bool
 
 	dbFile string
@@ -95,6 +97,7 @@ func initConfig() {
 		device = viper.GetString("serial.device")
 		baudrate = viper.GetInt("serial.baudrate")
 		bytesize = byte(viper.GetInt("serial.bytesize"))
+		stopbits = byte(viper.GetInt("serial.stopbits"))
 		lograw = viper.GetBool("serial.lograw")
 		dbFile = viper.GetString("sqlite.file")
 		dbInit = viper.GetBool("sqlite.init")
diff --git a/cmd/start.go b/cmd/start.go
index 0857a5a..4083d79 100644
--- a/cmd/start.go
+++ b/cmd/start.go
@@ -86,7 +86,7 @@ func start() {
 	for utils.ServerRunning {
 		if !utils.IsPortOpen() {
 			log.Println("try to open port")
-			err := utils.OpenPort(device, baudrate, bytesize)
+			err := utils.OpenPort(device, baudrate, bytesize, stopbits)
 			if err != nil {
 				log.Fatal("error in open serial port ", err)
 			}
diff --git a/cmd/test.go b/cmd/test.go
index 18c2391..8b0832d 100644
--- a/cmd/test.go
+++ b/cmd/test.go
@@ -16,9 +16,10 @@ limitations under the License.
 package cmd
 
 import (
+	"log"
+
 	"github.com/spf13/cobra"
 	"it2000.com.cn/tele-recv/utils"
-	"log"
 )
 
 // testCmd represents the test command
@@ -35,7 +36,7 @@ Test load sqlite database and init table`,
 
 func test() {
 	log.Println("Testing environment")
-	_ = utils.OpenPort(device, baudrate, bytesize)
+	_ = utils.OpenPort(device, baudrate, bytesize, stopbits)
 
 	err := utils.InitDb(dbFile, dbInit)
 	if err != nil {
diff --git a/telegram.yaml b/telegram.yaml
index 56d430a..213dd07 100644
--- a/telegram.yaml
+++ b/telegram.yaml
@@ -1,7 +1,8 @@
 serial:
   device: ttyS1
   baudrate: 9600
-  bytesize: 7
+  bytesize: 8
+  stopbits: 7
   lograw: true
 
 
diff --git a/utils/serial.go b/utils/serial.go
index 06c1855..cd5575d 100644
--- a/utils/serial.go
+++ b/utils/serial.go
@@ -12,13 +12,21 @@ var (
 	device     string
 	baudrate   int
 	bytesize   byte
+	stopbits   byte
 	port       *serial.Port
 	portOpened = false
 )
 
-func OpenPort(device string, baudrate int, bytesize byte) error {
-	log.Println("opening port device:", device, ", baudrate=", baudrate, ", bytesize=", bytesize)
-	config := &serial.Config{Name: device, Baud: baudrate, Size: bytesize, ReadTimeout: time.Second * 1}
+const readDuration = 500 * time.Millisecond
+
+// OpenPort open serial port
+func OpenPort(device string, baudrate int, bytesize byte, stopbits byte) error {
+	log.Println("opening port device:", device, ", baudrate=", baudrate, ", bytesize=", bytesize, "stopbits=", stopbits)
+	config := &serial.Config{Name: device,
+		Baud:        baudrate,
+		Size:        bytesize,
+		StopBits:    serial.StopBits(stopbits),
+		ReadTimeout: readDuration}
 	var err error
 	port, err = serial.OpenPort(config)
 	if err != nil {
@@ -30,6 +38,7 @@ func OpenPort(device string, baudrate int, bytesize byte) error {
 	return nil
 }
 
+//ReadPort read byte array from port
 func ReadPort() ([]byte, int) {
 	buffer := make([]byte, 256)
 	if !ServerRunning {
@@ -43,6 +52,7 @@ func ReadPort() ([]byte, int) {
 	return buffer, count
 }
 
+//IsPortOpen check serial port status
 func IsPortOpen() bool {
 	return portOpened
 }