diff --git a/api/@ohos.usbManager.serial.d.ts b/api/@ohos.usbManager.serial.d.ts
index 937fe88b31050d884040cc96f1fe2233cc8728ec..73a5022e54f889c4b2ba4f9870ef995c187cc9ec 100644
--- a/api/@ohos.usbManager.serial.d.ts
+++ b/api/@ohos.usbManager.serial.d.ts
@@ -22,7 +22,8 @@
  * Provides APIs for managing USB-to-virtual serial ports and implementing USB-to-virtual serial port communication.
  * @namespace serialManager
  * @syscap SystemCapability.USB.USBManager.Serial
- * @since 19
+ * @since arkts {'1.1':'19', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare namespace serialManager {
 
@@ -30,7 +31,8 @@ declare namespace serialManager {
    * Obtains the serial port device list.
    * @returns { Readonly<SerialPort>[]} Returns the list of serial port devices obtained.
    * @syscap SystemCapability.USB.USBManager.Serial
-   * @since 19
+   * @since arkts {'1.1':'19', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function getPortList(): Readonly<SerialPort>[];
 
@@ -45,9 +47,25 @@ declare namespace serialManager {
    * @throws { BusinessError } 31400003 Device does not exist.
    * @syscap SystemCapability.USB.USBManager.Serial
    * @since 19
+   * @arkts 1.1
    */
   function hasSerialRight(portId: number): boolean;
 
+/**
+   * Checks whether a serial port device has the access right. The system applications have the access right by default.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @returns {boolean} Returns <b class="+ topic/ph hi-d/b " id="b48481049115520">true</b> if the device has the right; returns <b class="+ topic/ph hi-d/b " id="b192241323195610">false</b> otherwise.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 14400005 Database operation exception.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @since 20
+   * @arkts 1.2
+   */
+  function hasSerialRight(portId: int): boolean;
+
   /**
    * Requests the right for accessing a serial port device from the user. The system applications do not need to call this API.
    * @param { number} portId ID of the target device. For details, see <b>SerialPort.portId</b>.
@@ -61,9 +79,27 @@ declare namespace serialManager {
    * @throws { BusinessError } 31400003 Device does not exist.
    * @syscap SystemCapability.USB.USBManager.Serial
    * @since 19
+   * @arkts 1.1
    */
   function requestSerialRight(portId: number): Promise<boolean>;
 
+  /**
+   * Requests the right for accessing a serial port device from the user. The system applications do not need to call this API.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @returns { Promise<boolean> } Promise used to return the result.
+   * The value <b class="+ topic/ph hi-d/b " id="b529434412284">true</b> means the user allows the access;
+   * the value <b class="+ topic/ph hi-d/b " id="b89755211297">false</b> means the opposite.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 14400005 Database operation exception.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @since 20
+   * @arkts 1.2
+   */
+  function requestSerialRight(portId: int): Promise<boolean>;
+
   /**
    * Adds the access right for a serial port device.
    * @permission ohos.permission.MANAGE_USB_CONFIG
@@ -79,9 +115,29 @@ declare namespace serialManager {
    * @syscap SystemCapability.USB.USBManager.Serial
    * @systemapi
    * @since 19
+   * @arkts 1.1
    */
   function addSerialRight(tokenId: number, portId: number): void;
 
+  /**
+   * Adds the access right for a serial port device.
+   * @permission ohos.permission.MANAGE_USB_CONFIG
+   * @param { int } tokenId Token ID of the target application.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @throws { BusinessError } 201 Permission verification failed. The application does not have the permission required to call the API.
+   * @throws { BusinessError } 202 Permission verification failed. A non-system application calls a system API.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 14400005 Database operation exception.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @systemapi
+   * @since 20
+   * @arkts 1.2
+   */
+  function addSerialRight(tokenId: int, portId: int): void;
+
   /**
    * Cancels the access right for a serial port device. This API will not cancel the default access right of system applications.
    * @param { number} portId ID of the target device. For details, see <b>SerialPort.portId</b>.
@@ -93,9 +149,25 @@ declare namespace serialManager {
    * @throws { BusinessError } 31400003 Device does not exist.
    * @syscap SystemCapability.USB.USBManager.Serial
    * @since 19
+   * @arkts 1.1
    */
   function cancelSerialRight(portId: number): void;
 
+  /**
+   * Cancels the access right for a serial port device. This API will not cancel the default access right of system applications.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 14400005 Database operation exception.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400002 Access denied. Call requestSerialRight to request user authorization first.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @since 20
+   * @arkts 1.2
+   */
+  function cancelSerialRight(portId: int): void;
+
   /**
    * Opens a serial port device.
    * @param { number} portId ID of the target device. For details, see <b>SerialPort.portId</b>.
@@ -107,9 +179,25 @@ declare namespace serialManager {
    * @throws { BusinessError } 31400004 The serial port device is occupied.
    * @syscap SystemCapability.USB.USBManager.Serial
    * @since 19
+   * @arkts 1.1
    */
   function open(portId: number): void;
 
+  /**
+   * Opens a serial port device.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400002 Access denied. Call requestSerialRight to request user authorization first.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @throws { BusinessError } 31400004 The serial port device is occupied.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @since 20
+   * @arkts 1.2
+   */
+  function open(portId: int): void;
+
   /**
    * Closes a serial port device.
    * @param { number} portId ID of the target device. For details, see <b>SerialPort.portId</b>.
@@ -120,9 +208,24 @@ declare namespace serialManager {
    * @throws { BusinessError } 31400005 The serial port device is not opened. Call the open API first.
    * @syscap SystemCapability.USB.USBManager.Serial
    * @since 19
+   * @arkts 1.1
    */
   function close(portId: number): void;
 
+  /**
+   * Closes a serial port device.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @throws { BusinessError } 31400005 The serial port device is not opened. Call the open API first.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @since 20
+   * @arkts 1.2
+   */
+  function close(portId: int): void;
+
   /**
    * Obtains the communication parameters of a serial port device.
    * @param { number} portId ID of the target device. For details, see <b>SerialPort.portId</b>.
@@ -134,9 +237,25 @@ declare namespace serialManager {
    * @throws { BusinessError } 31400005 The serial port device is not opened. Call the open API first.
    * @syscap SystemCapability.USB.USBManager.Serial
    * @since 19
+   * @arkts 1.1
    */
   function getAttribute(portId: number): Readonly<SerialAttribute>;
 
+  /**
+   * Obtains the communication parameters of a serial port device.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @returns { Readonly<SerialAttribute> } Communication parameters obtained, which are read-only.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @throws { BusinessError } 31400005 The serial port device is not opened. Call the open API first.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @since 20
+   * @arkts 1.2
+   */
+  function getAttribute(portId: int): Readonly<SerialAttribute>;
+
   /**
    * Sets the communication parameters for a serial port device.
    * @param { number} portId ID of the target device. For details, see <b>SerialPort.portId</b>.
@@ -148,9 +267,25 @@ declare namespace serialManager {
    * @throws { BusinessError } 31400005 The serial port device is not opened. Call the open API first.
    * @syscap SystemCapability.USB.USBManager.Serial
    * @since 19
+   * @arkts 1.1
    */
   function setAttribute(portId: number, attribute: SerialAttribute): void;
 
+  /**
+   * Sets the communication parameters for a serial port device.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @param { SerialAttribute } attribute Communication parameters to set.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @throws { BusinessError } 31400005 The serial port device is not opened. Call the open API first.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @since 20
+   * @arkts 1.2
+   */
+  function setAttribute(portId: int, attribute: SerialAttribute): void;
+
   /**
    * Reads data from a serial port device. This API uses a promise to return the result.
    * @param { number} portId ID of the target device. For details, see <b>SerialPort.portId</b>.
@@ -167,9 +302,30 @@ declare namespace serialManager {
    * @throws { BusinessError } 31400007 I/O exception.
    * @syscap SystemCapability.USB.USBManager.Serial
    * @since 19
+   * @arkts 1.1
    */
   function read(portId: number, buffer: Uint8Array, timeout?: number): Promise<number>;
 
+  /**
+   * Reads data from a serial port device. This API uses a promise to return the result.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @param { Uint8Array } buffer Buffer for storing the data read, with a maximum length of 8192 bytes.
+   * @param { int } timeout Timeout duration for reading data. The value is a non-negative number.
+   * The default value <b class="+ topic/ph hi-d/b " id="b98612056312">0</b> indicates that there is no time limit for data reading.
+   * @returns { Promise<int> } Promise used to return the length of the data read.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @throws { BusinessError } 31400005 The serial port device is not opened. Call the open API first.
+   * @throws { BusinessError } 31400006 Data transfer timed out.
+   * @throws { BusinessError } 31400007 I/O exception.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @since 20
+   * @arkts 1.2
+   */
+  function read(portId: int, buffer: Uint8Array, timeout?: int): Promise<int>;
+
   /**
    * Reads data from a serial port device. This API returns the result synchronously.
    * @param { number} portId ID of the target device. For details, see <b>SerialPort.portId</b>.
@@ -186,9 +342,30 @@ declare namespace serialManager {
    * @throws { BusinessError } 31400007 I/O exception.
    * @syscap SystemCapability.USB.USBManager.Serial
    * @since 19
+   * @arkts 1.1
    */
   function readSync(portId: number, buffer: Uint8Array, timeout?: number): number;
 
+  /**
+   * Reads data from a serial port device. This API returns the result synchronously.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @param { Uint8Array } buffer Buffer for storing the data read, with a maximum length of 8192 bytes.
+   * @param { int } timeout Timeout duration for reading data. The value is a non-negative number.
+   * The default value <b class="+ topic/ph hi-d/b " id="b25229382302">0</b> indicates that there is no time limit for data reading.
+   * @returns {int} Length of the data read.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @throws { BusinessError } 31400005 The serial port device is not opened. Call the open API first.
+   * @throws { BusinessError } 31400006 Data transfer timed out.
+   * @throws { BusinessError } 31400007 I/O exception.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @since 20
+   * @arkts 1.2
+   */
+  function readSync(portId: int, buffer: Uint8Array, timeout?: int): int;
+
   /**
    * Writes data to a serial port device. This API uses a promise to return the result.
    * @param { number} portId ID of the target device. For details, see <b>SerialPort.portId</b>.
@@ -205,9 +382,30 @@ declare namespace serialManager {
    * @throws { BusinessError } 31400007 I/O exception.
    * @syscap SystemCapability.USB.USBManager.Serial
    * @since 19
+   * @arkts 1.1
    */
   function write(portId: number, buffer: Uint8Array, timeout?: number): Promise<number>;
 
+  /**
+   * Writes data to a serial port device. This API uses a promise to return the result.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @param { Uint8Array } buffer Buffer for storing the data written, with a maximum length of 128 KB.
+   * @param { int } timeout Timeout duration for writing data. The value is a non-negative number.
+   * The default value <b class="+ topic/ph hi-d/b " id="b2661577365">0</b> indicates that there is no time limit for data writing.
+   * @returns { Promise<int> } Promise used to return the length of the data written.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @throws { BusinessError } 31400005 The serial port device is not opened. Call the open API first.
+   * @throws { BusinessError } 31400006 Data transfer timed out.
+   * @throws { BusinessError } 31400007 I/O exception.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @since 20
+   * @arkts 1.2
+   */
+  function write(portId: int, buffer: Uint8Array, timeout?: int): Promise<int>;
+
   /**
    * Writes data to a serial port device. This API returns the result synchronously.
    * @param { number} portId ID of the target device. For details, see <b>SerialPort.portId</b>.
@@ -224,14 +422,36 @@ declare namespace serialManager {
    * @throws { BusinessError } 31400007 I/O exception.
    * @syscap SystemCapability.USB.USBManager.Serial
    * @since 19
+   * @arkts 1.1
    */
   function writeSync(portId: number, buffer: Uint8Array, timeout?: number): number;
 
+  /**
+   * Writes data to a serial port device. This API returns the result synchronously.
+   * @param { int } portId ID of the target device. For details, see <b>SerialPort.portId</b>.
+   * @param { Uint8Array } buffer Buffer for storing the data written, with a maximum length of 128 KB.
+   * @param { int } timeout Timeout duration for writing data. The value is a non-negative number.
+   * The default value <b class="+ topic/ph hi-d/b " id="b45639213380">0</b> indicates that there is no time limit for data writing.
+   * @returns { int } Length of the data written.
+   * @throws { BusinessError } 401 Parameter error. Possible causes:
+   * 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.
+   * @throws { BusinessError } 31400001 Serial port management exception.
+   * @throws { BusinessError } 31400003 Device does not exist.
+   * @throws { BusinessError } 31400005 The serial port device is not opened. Call the open API first.
+   * @throws { BusinessError } 31400006 Data transfer timed out.
+   * @throws { BusinessError } 31400007 I/O exception.
+   * @syscap SystemCapability.USB.USBManager.Serial
+   * @since 20
+   * @arkts 1.2
+   */
+  function writeSync(portId: int, buffer: Uint8Array, timeout?: int): int;
+
   /**
    * Represents a serial port device.
    * @typedef SerialPort
    * @syscap SystemCapability.USB.USBManager.Serial
-   * @since 19
+   * @since arkts {'1.1':'19', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   interface SerialPort {
 
@@ -240,14 +460,25 @@ declare namespace serialManager {
      * @type { number }
      * @syscap SystemCapability.USB.USBManager.Serial
      * @since 19
+     * @arkts 1.1
      */
     portId: number;
 
+    /**
+     * Serial port device ID.
+     * @type { int }
+     * @syscap SystemCapability.USB.USBManager.Serial
+     * @since 20
+     * @arkts 1.2
+     */
+    portId: int;
+
     /**
      * Serial port device name.
      * @type { string }
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     deviceName: string;
  }
@@ -255,7 +486,8 @@ declare namespace serialManager {
    * Represents the communication parameters of a serial port device.
    * @typedef SerialAttribute
    * @syscap SystemCapability.USB.USBManager.Serial
-   * @since 19
+   * @since arkts {'1.1':'19', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   interface SerialAttribute {
 
@@ -263,7 +495,8 @@ declare namespace serialManager {
      * Baud rate.
      * @type { BaudRates }
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     baudRate: BaudRates;
 
@@ -272,7 +505,8 @@ declare namespace serialManager {
      * @type { DataBits }
      * @default DATABIT_8
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     dataBits?: DataBits;
 
@@ -281,7 +515,8 @@ declare namespace serialManager {
      * @type { Parity }
      * @default NONE
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     parity?: Parity;
 
@@ -290,7 +525,8 @@ declare namespace serialManager {
      * @type { StopBits }
      * @default STOPBIT_1
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     stopBits?: StopBits;
  }
@@ -298,35 +534,40 @@ declare namespace serialManager {
    * Enumerates the baud rates of a serial port device, in bit/s.
    * @enum { number }
    * @syscap SystemCapability.USB.USBManager.Serial
-   * @since 19
+   * @since arkts {'1.1':'19', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   enum BaudRates {
 
     /**
      * The baud rate is 50 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_50 = 50,
 
     /**
      * The baud rate is 75 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_75 = 75,
 
     /**
      * The baud rate is 110 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_110 = 110,
 
     /**
      * The baud rate is 134 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_134 = 134,
 
@@ -334,182 +575,208 @@ declare namespace serialManager {
      * The baud rate is 150 bit/s.
      *
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_150 = 150,
 
     /**
      * The baud rate is 200 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_200 = 200,
 
     /**
      * The baud rate is 300 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_300 = 300,
 
     /**
      * The baud rate is 600 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_600 = 600,
 
     /**
      * The baud rate is 1200 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_1200 = 1200,
 
     /**
      * The baud rate is 1800 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_1800 = 1800,
 
     /**
      * The baud rate is 2400 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_2400 = 2400,
 
     /**
      * The baud rate is 4800 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_4800 = 4800,
 
     /**
      * The baud rate is 9600 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_9600 = 9600,
 
     /**
      * The baud rate is 19200 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_19200 = 19200,
 
     /**
      * The baud rate is 38400 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_38400 = 38400,
 
     /**
      * The baud rate is 57600 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_57600 = 57600,
 
     /**
      * The baud rate is 115200 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_115200 = 115200,
 
     /**
      * The baud rate is 230400 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_230400 = 230400,
 
     /**
      * The baud rate is 460800 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_460800 = 460800,
 
     /**
      * The baud rate is 500000 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_500000 = 500000,
 
     /**
      * The baud rate is 576000 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_576000 = 576000,
 
     /**
      * The baud rate is 921600 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_921600 = 921600,
 
     /**
      * The baud rate is 1000000 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_1000000 = 1000000,
 
     /**
      * The baud rate is 1152000 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_1152000 = 1152000,
 
     /**
      * The baud rate is 1500000 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_1500000 = 1500000,
 
     /**
      * The baud rate is 2000000 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_2000000 = 2000000,
 
     /**
      * The baud rate is 2500000 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_2500000 = 2500000,
 
     /**
      * The baud rate is 3000000 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_3000000 = 3000000,
 
     /**
      * The baud rate is 3500000 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_3500000 = 3500000,
 
     /**
      * The baud rate is 4000000 bit/s.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     BAUDRATE_4000000 = 4000000
  }
@@ -517,85 +784,89 @@ declare namespace serialManager {
    * Enumerates the data bits of a serial port device.
    * @enum { number }
    * @syscap SystemCapability.USB.USBManager.Serial
-   * @since 19
+   * @since arkts {'1.1':'19', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   enum DataBits {
 
     /**
      * The number of data bits is 8.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     DATABIT_8 = 8,
 
     /**
      * The number of data bits is 7.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     DATABIT_7 = 7,
 
     /**
      * The number of data bits is 6.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     DATABIT_6 = 6,
 
     /**
      * The number of data bits is 5.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
-    DATABIT_5 = 5,
-
-    /**
-     * The number of data bits is 4.
-     * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
-     */
-    DATABIT_4 = 4
+    DATABIT_5 = 5
  }
   /**
    * Enumerates the parity bits of a serial port device.
    * @enum { number }
    * @syscap SystemCapability.USB.USBManager.Serial
-   * @since 19
+   * @since arkts {'1.1':'19', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   enum Parity {
 
     /**
      * No parity.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     PARITY_NONE = 0,
 
     /**
      * Odd parity.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     PARITY_ODD = 1,
 
     /**
      * Even parity.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     PARITY_EVEN = 2,
 
     /**
      * Mark parity, whose parity bit is always <b class="+ topic/ph hi-d/b " id="b1627884485115">1</b>.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     PARITY_MARK = 3,
 
     /**
      * Space parity, whose parity bit is always <b class="+ topic/ph hi-d/b " id="b1551818484291">0</b>.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     PARITY_SPACE = 4
  }
@@ -603,31 +874,27 @@ declare namespace serialManager {
    * Enumerates the stop bits for serial port communication.
    * @enum { number }
    * @syscap SystemCapability.USB.USBManager.Serial
-   * @since 19
+   * @since arkts {'1.1':'19', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   enum StopBits {
 
     /**
      * The number of stop bits is 1.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     STOPBIT_1 = 0,
 
-    /**
-     * The number of stop bits is 1.5.
-     * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
-     */
-    STOPBIT_1P5 = 1,
-
     /**
      * The number of stop bits is 2.
      * @syscap SystemCapability.USB.USBManager.Serial
-     * @since 19
+     * @since arkts {'1.1':'19', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
-    STOPBIT_2 = 2
+    STOPBIT_2 = 1
  }
 }
 
-export default serialManager;
\ No newline at end of file
+export default serialManager;