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DCN Next Generation Open Interface Release 2.4 General
en | 22
Bosch Communications Systems | 2007 February | SRS_INF | Du010933
For the protocol the following items are of importance:
• Before accepting any data-messages a heartbeat packet must be received first. Because
the heartbeat includes the sequence number of the next data packet, the receiver can only
check if the received data packet is in sequence after the reception of a heartbeat.
• The sequence number coming along with the message must be used to detect if a
message is received twice (same sequence number).
• Each message is sent with a checksum. After each message sent, the transmitter waits for
the (negative) acknowledge from the receiver.
• Upon reception of a message, the checksum is checked and a response (ACK or NAK
packet) is sent back according to the result.
• After sending a message the transmitter waits for a valid ACK or NAK message. Any
incorrect message received before the ACK message will be ignored.
• The sending side retransmits the message upon reception of a negative acknowledge or
after a time-out time.
• A maximum of 2 retries will be done (either on time-out or on reception of negative
acknowledge).
• The maximum message length is limited to 5000 bytes to detect transmission errors in the
length field of the message (see §4.1.2.4.3).
• The connection-check will be performed using a heartbeat mechanism (see §4.1.2.4.3).
• The maximum delay between two bytes may be 50 ms.
4.1.2.4.1 Negative Acknowledge handling
When an invalid checksum is received a NAK-packet should be transmitted to request a
retransmission of the packet. To help the sending side the receiver should sent along with the
packet the sequence number expected. This sequence number can have the following
values:
Expecting packet
Transmit Acknowledge
Transmit message Transmit NAK
A
: Unmark Message
A
: Set last ACK-seq = 0
C: Correct Message packet received
A
: Send ACK (sequence received)
A
: Set last ACK-seq = received-seq
C: Packet Checksum failed
C: Marked Message absent
A
: Send NAK (sequence expected)
C: Request to send Message packet
A
: Mark Message
A
: Send Message packet
C: TRUE
C: Packet Checksum failed
C: Marked Message present
A
: Ignore Packet
C: Correct ACK packet received
C: Marked Message present
A
: Unmark Message
C: ( Correct NAK(Sequence) packet
C: || Timeout of ACK/NAK reception)
C: && Marked Message present
A
: Send marked message packet
C: TRUE
C: TRUE
Figure 3 State transition diagram 'Full' feature protocol
- DCN Next Generation 1
- Open Interface Release 2.4 1
- Table of sections 3
- General Description 5
- 1.3 References 9
- 1.4 Overview 9
- 2. SYSTEM SETUP 10
- 2.2 Requirements 11
- 2.3 Hardware connection 11
- 3. MESSAGE FORMAT 12
- 3.3 Ethernet message layout 15
- 3.3.4 Buffer overflow 17
- 4. PROTOCOL DESCRIPTION 18
- } RSMT_CHECKSUM; 20
- BYTE byCorrection; 20
- BYTE byChecksum; 20
- Controlling PC 24
- 5. REMOTE FUNCTIONS 29
- APPENDIX C. ERROR CODES 34
- 2. SC, SI AND DB 40
- 2.3 System Modes 41
- 3.4 SC_C_STOP_APP 43
- 3.5 SC_C_GET_CCU_VERSIONINFO 43
- 3.9 SC_C_GET_SLAVE_NODES 48
- Related functions 49
- SC_C_GET_SERIAL_NUMBER 49
- 4.2 SC_C_CCU_REBOOT 52
- 4.3 SC_C_CONNECT_UNIT 52
- 4.4 SC_C_DISCONNECT_UNIT 53
- 4.5 SC_C_CONNECT_SLAVE_CCU 53
- 4.7 SC_C_CCU_MODE_CHANGE 54
- 4.8 SC_C_UNIT_SERIAL_NR 54
- WORD wInstallMode; 55
- 5.3 SI_C_STOP_INSTALL 56
- 5.4 SI_C_SELECT_UNIT 56
- 5.5 SI_C_SET_MASTER_VOL 57
- 5.6 SI_C_SET_EXT_CONTACT 57
- 5.7 SI_C_GET_EXT_CONTACT 58
- 5.8 SI_C_SET_MICROPHONE_GAIN 58
- WORD wUnitId; 59
- WORD wGain; 59
- WORD wUnitId; 59
- WORD wGain; 59
- DWORD dwSerialNr; 60
- BYTE byMode; 60
- } SI_T_OPERATION_MODE; 60
- SI_T_SLAVE_ID tSlaveId; 61
- BYTE byUnitType; 62
- } SI_T_UNIT_STRUCT; 62
- 6.3 SI_C_OPERATION_MODE 63
- 6.4 SI_C_SLAVE_ID 63
- BYTE byControlType; 64
- } DB_T_APP_CONTROL; 64
- 7.4 DB_C_MAINT_CCU 65
- 7.5 DB_C_DOWNLOAD_CCU 67
- 7.6 DB_C_CLEAR_CCU 67
- 7.7 DB_C_CCU_APPLY_ONE 68
- Microphone Management 79
- WORD wOperationMode; 90
- WORD wActiveMics; 91
- 3.2.7 MM_C_GET_SETTINGS 92
- 3.2.8 MM_C_SET_SETTINGS 93
- BOOLEAN bMicroOn; 94
- } MM_T_MICRO_ONOFF; 94
- } MM_T_SPK; 95
- 3.3.5 MM_C_SPK_GET 96
- 3.4.1 MM_C_CS_REMOVE 96
- WORD wNrOfCS; 97
- } MM_T_CCU_CSLIST; 97
- 3.5.2 MM_C_NBK_CLEAR 98
- 3.5.3 MM_C_NBK_GET 98
- 3.5.4 MM_C_NBK_SET 99
- WORD wUnitId; 100
- WORD wDelegateId; 100
- } MM_T_RTS; 100
- 3.6.1 MM_C_RTS_APPEND 101
- 3.6.2 MM_C_RTS_REMOVE 101
- 3.6.3 MM_C_RTS_CLEAR 101
- 3.6.4 MM_C_RTS_GET 102
- 3.6.5 MM_C_RTS_SET 102
- 3.6.6 MM_C_SHIFT 103
- 3.7.1 MM_C_CR_REMOVE 104
- 3.7.2 MM_C_CR_GET 104
- 3.8 MM Speechtime functions 105
- WORD wUnitId; 107
- 4. UPDATE NOTIFICATIONS 108
- 4.2 MM General notifications 110
- 4.3.2 MM_C_NR_CHAIR_MICS_ON 111
- 4.3.3 MM_C_SPK_SET_ON_PC 111
- 4.3.4 MM_C_SPK_CLEAR_ON_PC 112
- 4.3.5 MM_C_SPK_APPEND_ON_PC 112
- 4.3.6 MM_C_SPK_REMOVE_ON_PC 112
- 4.3.7 MM_C_SPK_INSERT_ON_PC 112
- 4.3.8 MM_C_SPK_REPLACE_ON_PC 112
- MM_T_SPK tNewSpk; 113
- } MM_T_SPK_REPLACE; 113
- MM_T_SPK tCSpkAdd; 113
- MM_T_SPK tCSpkRemove; 113
- WORD wMicroType; 114
- } MM_T_NBK; 114
- 4.6.5 MM_C_RTS_INSERT_ON_PC 115
- 4.6.6 MM_C_RTS_REPLACE_ON_PC 115
- 4.7.1 MM_C_CR_CLEAR_ON_PC 116
- 4.7.2 MM_C_CR_ADD_ON_PC 116
- 4.7.3 MM_C_CR_REMOVE_ON_PC 116
- 4.7.4 MM_C_CR_REPLACE_ON_PC 116
- 4.8.1 MM_C_TIMER_ON_OFF 116
- APPENDIX B. ERROR CODES 120
- APPENDIX C. EXAMPLES 122
- Camera Control 125
- 1. INTRODUCTION 127
- 2.1 Introduction 128
- 3. REMOTE FUNCTIONS 129
- 3.2.2 CC_C_STOP_CAMERA_APP 130
- BYTE bySeatTextMode; 131
- } CC_T_GLOBAL_SETTINGS; 131
- 3.2.8 CC_C_SET_CAMERA_ID 134
- WORD wLength; 135
- } CC_T_DATA_FRAME; 135
- Event CC_C_RECEIVE_DATA 138
- 4.2 CC General notifications 139
- Simultaneous Interpretation 145
- WORD wDummy; 149
- WORD wPCActive; 149
- WORD wNrOfInstances 150
- WORD wNrOfInstances; 150
- 3.2.7 IN_C_BOOTH_UPDATE 153
- 3.2.8 IN_C_UPDATE_LCK 154
- 3.2.9 IN_C_UPDATE_LOCK 154
- 3.2.10 IN_C_LOAD_INT_DB 155
- 3.2.11 IN_C_CHANNEL_UPDATE 157
- BOOLEAN bFloorDistribution; 159
- BOOLEAN bSpeakSlowlySign; 160
- BOOLEAN bHelpSign; 161
- 3.2.19 IN_C_GET_HELP_SIGN 162
- 3.2.20 IN_C_ASSIGN_UNIT 162
- 4.2.1 IN_C_CHAN_STATUS 2 166
- 4.2.2 IN_C_CCU_CONFIG 2 167
- 4.2.3 IN_C_FLASHING_MIC_ON 1 168
- 4.2.5 IN_C_LANGUAGE_LIST 15 168
- BOOLEAN bSpeakSlowlySign 6 169
- BOOLEAN bHelpSign 13 169
- APPENDIX B. ERROR CODES 1 171
- APPENDIX C. EXAMPLES 1 172
- 2.1 Voting subject 178
- 2.2 Voting kind 178
- 2.3 General Voting setting 178
- 2.4 Communication settings 178
- 2.5.1 Standalone settings 181
- 3.2.2 VT_C_STOP_APP 184
- 3.2.3 VT_C_START_VOTING 184
- BOOLEAN bShowResults; 185
- } VT_T_SHOW_RESULTS; 185
- 3.2.6 VT_C_RESTART_VOTING 186
- 3.2.7 VT_C_DOWNLOAD_SUBJECT 186
- 3.2.8 VT_C_SET_VOTINGPARAMS 187
- VT_C_100_EXTERNAL_PRESENT 191
- BYTE byAttentionTone; 191
- BYTE byAttentionTone; 192
- VT_C_100_EXTERNAL_PRESENT 5 195
- Text Status Display 203
- 3.2.2 LD_C_STOP_LD_APP 208
- WORD wDisplayId; 209
- 4.2 LD General notifications 213
- Message Distribution 219
- 3.2.2 MD_C_STOP_MON_MD 225
- 3.2.5 MD_C_AUX_LED_CONTROL 226
- Attendance Registration 235
- 2.2.1 State definitions 240
- 2.2.2 Events definitions 241
- 2.2.3 Parameter definitions 241
- 2.2.4 Event / state matrix 241
- BYTE byRemoteControlType; 247
- } AT_T_APPCONTROL; 247
- 3.2.2 AT_C_STOP_AT_APP 248
- 3.2.3 AT_C_STORE_SETTING 248
- BOOLEAN bAttendanceOn; 249
- BOOLEAN bAccessOn; 249
- } AT_T_ACTIVATE; 249
- WORD wClusterIndex; 251
- } AT_T_GET_REGISTRATION; 251
- WORD wAttend; 254
- WORD wLeave; 254
- } AT_T_REGISTER_TOTAL; 254
- Intercom 263
- 2.2 Remote Intercom Control 266
- 3.2.2 IC_C_CLOSE_IC_APP 268
- 3.2.3 IC_C_SET_LINKS 268
- 3.2.4 IC_C_CLEAR_ LINKS 268
- BYTE byLines; 269
- 4.2.2 IC_UPD_OPERATOR_STATE 270
- 4.2.3 IC_UPD_CONNECTION_INFO 270
- 4.2.4 IC_UPD_INCOMING_CALL 270
- Appendix DCN Wireless 275
- 2.1 Remote function handling 278
- 3.1 SC_C_GET_CCU_VERSIONINFO 279
- 3.2 SC_C_GET_CCU_CONFIG 279
- WORD wNrOfUnits; 280
- } SC_T_UNIT_LIST; 280
- 3.5 SC_C_SIGNAL_STATUS_REQ 281
- 3.6 SC_C_SIGNAL_QUALITY_REQ 281
- 3.7 SC_C_VERSIONINFO_REQ 281
- 4.1 Introduction 283
- 4.2 SC_C_BATTERY_STATUS 283
- 4.3 SC_C_BATTERY_INFO_SERIAL 283
- 4.4 SC_C_BATTERY_INFO_COND 284
- 4.5 SC_C_SIGNAL_STATUS 284
- 4.6 SC_C_SIGNAL_QUALITY 284
- 4.7 SC_C_HW_VERSIONINFO 285
- 4.8 SC_C_SW_VERSIONINFO 285
- 5.1 SI_C_GET_WAP_SETTINGS 286
- 5.2 SI_C_SET_WAP_SETTINGS 286
- BYTE bySystemId; 287
- BYTE byRepetitions; 287
- } SI_T_WIRELESS_SETTINGS; 287
- SI_T_WIRELESS_MODE tMode; 288
- } SI_T_UNIT_LIST; 289
- 6.1 SI_C_WAP_SETTINGS 290
- 6.2 SI_C_WIRELESS_SETTINGS 290
- 6.3 SI_C_WIRELESS_MODE 290
- 7.1 MM_C_GET_SETTINGS 291
- 7.2 MM_C_SET_SETTINGS 291
- 8.1 MM_C_SET_SETTINGS_ON_PC 292
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