User manual HARMAN KARDON CITATION 21

[. . . ] The control data is sent from the PC or control device to the AVR using commands issued using either a PC Keyboard or Mouse or a touch screen controller and data from the AVR with its status may be displayed on the PC or interpreted for touch screen display. Harman Kardon AVR Products RS-232 Code Programming Information Version 1. 0 ~ 14-November-05 Page 2 of 12 3. 0 Connections and Settings 3. 1 Connections The connection between the computer and the AVR is via a two-wire connection using standard DB-9 connections. The connections should be made directly ("straight through") from pin 3 (TxD) to pin 3, and from pin 5 (GND) to pin 5. No other connections are needed, although a standard serial connection cable with all pins connected may be used. [. . . ] DO NOT use a "null modem" cable. Since the AVR cross over the pin connections internally, the use of null modem cable will render RS-232 control system inoperable. 3. 2 RS-232 Settings The following settings should be made on PC or control device: Baud Rate: 38, 400 bps Data Bits: 8 Parity: No Stop Bit: 1 Flow Control: No (off) Command Acceptance Time: 50 ms 4. 0 Data Communication Format 4. 1. Transmission Transmission Data Type Length Information Field Check Sum Transmission recognition code is 6 bytes long ASCII code and it is used to make a distinction between AVR Control Data being sent from PC to AVR or AVR status Data coming from AVR to be displayed on PC. Following codes are used for this purpose: "PCSEND"(ASCII) AVR Control Data (PC to AVR) using PC Keyboard or Mouse "MPSEND"(ASCII) Data for AVR Status Display on PC (AVR to PC) Harman Kardon AVR Products RS-232 Code Programming Information Version 1. 0 ~ 14-November-05 Page 3 of 12 4. 2 Data Type Transmission Data Type Length Information Field Check Sum Data Type field is a one byte long and distinguishes between different types of data being used in protocol as explained in the following table: Purpose DSP UPGRADE PC Remote Controller CPU UPGRADE Send Data from AVR 4. 3 Data Length Transmission Data Type Length Information Field Check Sum Direction PC AVR PC AVR PC AVR AVR PC Value 1 2 4 3 Length field is one byte long and represents length of information field. As information field is variable depending on direction of data transfer, this field is necessary. Length field value will be 4 if Remote Control through PC to AVR is used and the value will be 48 if AVR status display on PC is desired. 4. 4 Information Field Transmission Data Type Length Information Field Check Sum Information field is hex code data of either four-byte command from PC to AVR or 48-byte hex code for AVR status display on PC. We explain both of them in detail in the following sections: Harman Kardon AVR Products RS-232 Code Programming Information Version 1. 0 ~ 14-November-05 Page 4 of 12 4. 4. 1 Information Field Command Sequences 4. 4. 1. 1 Command Transmission Sequence from PC to AVR Each command consists of a four-byte hex code from the table at the end of this document. In constructing commands for Surround Select, Multi-room, Speaker Configuration, Digital Input and Delay, the direct access setup controls for these options require that you should first send the code that accesses the control sequence. To adjust the settings or scroll through the menus, you must then issue the specific "Up" or "Down" commands that are associated with the item being controlled. For example, when changing the surround mode using the Dolby, DTS Surround, DTS Neo:6, Logic 7 or Stereo commands, note that first command selects the mode and the next command should select the mode choices. 6. 0 Procedures for Switching AVR and PC Modes In case of AVR Normal Mode and PC Remote Control (REMOCON), normal protocol procedures as mentioned already will be applied. The following sections explain the other switching modes. 6. 1 Switching from PC REMOCON Mode to PC CPU Writing Mode Step 1: User selects CPU button at the screen box of PC REMOCON. As a result, PC sends the following command: Command: "PCSEND" + 0x04 + 0x02 + 0x00 + 0x00 + 0x00 + 0x00 Response: No response comes from AVR Step 2: After receiving the command from step 1, AVR will switch from normal mode to AVR CPU writing mode and will stop sending its status information. Step 3: User clicks the open button at the screen box of PC CPU Writing. User selects and loads CPU HEX DATA (This HEX file has Intel-HEX format) using explorer box. Harman Kardon AVR Products RS-232 Code Programming Information Version 1. 0 ~ 14-November-05 Page 7 of 12 Step 4: User clicks the Start button at the screen box of PC CPU Writing. [. . . ] This step creates the following protocol behind the scene: a) Check Connection ­ Following command is used to check connection: Command: 0x08 + Sync Data (0x00) X 16 + CRC (2bytes) Response: 0x08 + CRC (2bytes) Check CRC to make sure the message reached correctly. We have already discussed CRC calculation method. b) Erase Earlier Settings ­ Unless response is OK, continue to send this command: Command: 0x01 + CRC (2bytes) Response: if OK, 0x01 + CRC (2bytes) if Error, 0x0e + CRC (2bytes) c) Program CPU - Follow sending the required command, the command is sent again till correct response is received: Command: 0x03 + address (3bytes: Low, Mid, High byte in order) + Hex Data (256byte) + CRC (2bytes) Response: 0x03 + address (3bytes) + CRC (2bytes) Program Control Flow is as follows: Harman Kardon AVR Products RS-232 Code Programming Information Version 1. 0 ~ 14-November-05 Page 8 of 12 (d) Verify that program stored in CPU - Follow sending the required command, the command is sent again till correct response is received: Command: 0x04 + address (3bytes: Low, Mid, High byte in sequence) + CRC (2 bytes) Response: 0x04 + address (3bytes) + Hex Data (256) + CRC (2bytes) Verify Control Flow is as follows: (e) End CPU Writing/Work End ­ Following command and response are used: Command: 0x06 + CRC (2 bytes) Response: 0x06 + CRC (2 bytes) (f) CutOff ­ Following command and response are used: Command: 0x07 + CRC (2 bytes) Response: 0x07 + CRC (2 bytes) Harman Kardon AVR Products RS-232 Code Programming Information Version 1. 0 ~ 14-November-05 Page 9 of 12 Step 5: User switches from AVR CPU writing Mode to AVR Normal Mode. 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