C6810 JPEG Module w/UART Interface User Manual
Contents
1. ID 0x27 Description Set frame rate of video clip ID Command Oxaa 03 27 p1 checksum Parameter P1 Oxnn nn 1 15 in hex default is 5 note there is the limitation for the frame rate to duration of recording Operation Mode Preview mode Return from the 0x00 OK Module 0x01 Failed 0x50 Mode error Example Set frame rate to 15fps Host Module Oxaa 03 27 0f e3 Oxaa 30 aa 02 00 ac OK Wait for Response 48 0x30 Request System File information ID 0x30 Description Get system file information which includes total no of files and number of current file ID Command Oxaa 02 30 checksum Parameter Command n a Operation Mode Preview Playback mode Return from Module Preview Oxaa 03 p1 p2 checksum Playback Oxaa 05 pl p2 ql q2 checksum pl p2 total no of file q1 q2 the number of current file follow with the status 0x00 OK 0x01 Failed Example in the playback mode get current files in memory Host Oxaa 02 30 de Wait for Response Module Oxaa 30 aa 05 00 04 00 04 b7 total file is 4 current fie is 4 aa 0200ac OK Page 14 of 14 Rev 2 01 49 0x31 Get Current File information C6810 Users Manual ID 0x31 Description Get current file information which includes file s name and file size in of particular file Note this command MUST send before Download current file ID Command Oxaa 02 31 dd Paramete2. 4 channel UART lt active low common ground J5 UART port 4 pin connector 3 3VDC Tx ees Rx GND J6 Alarm output 2 pin connector active low ees 4 a output Note need to apply the short bar to select TV system PAL NTSC before power up 1 1 Pin description of the connectors E TANIA A tnanQ gt a e Za s3348 BBB Beas 8 28 DC and Video In Trigger In UART Video Out Alarm out 2 Module Specification On Board SD Ram 64 Mb 8 Mbytes Storage External SD card up to 4GB Display Connector Composite video out Video Capture 320 x 240 up to 15fps Photo Resolution 640 x 480 JPEG format UART Baud Rate 9600 bps Video Input 4Ch Composite video 1V p p Trigger Input 4Ch active low Alarm Output Active low Power Input DC 5V 500mA Board size 55 x47 mm 2 1 Electrical Characteristics at 5VDC Condition Min Typ Max Units Preview 264 267 270 mA CaptureJPG Peak capturing 268 273 282 mA CaptureAVI Peak recording 295 298 312 mA Playback JPG 312 270 272 mA Playback AVI 278 280 282 mA Data transmit 265 270 275 mA Note if SD card is used current consumption will be bigger about 10 20mA depends on the memory size as well as the brands Page 3 of 3 Rev 2 01 C6810 Users Manual Software 3 Send Commands to the Module First of all one needs to setup the communication between the host machine to the module Please follow the format described below to send the commands Otherwise the module will not response
3. Mode Preview mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error 0x03 External memory card write protect Example Format the external memory Host Module Oxaa 02 04 b0 Wait for OK Oxaa 30 aa 02 00ac OK 5 0x05 Motion Detect Set ID 0x05 Description Enable or disable Motion detect ID Command Oxaa 03 05 p1 checksum Parameter P1 0x00 off 0x01 on Operation Mode Preview mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Enable the motion detect Host Module Oxaa 03 05 01 b3 Oxaa 30aa 02 00ac OK Wait for OK 6 0x06 Motion Sensitivity Set ID 0x06 Description Set sensitivity for Motion detect ID Command Oxaa 03 06 p1 checksum Parameter P1 0x00 low 0x01 medium 0x02 high Operation Mode Preview mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Set sensitivity to High Host Module Oxaa 03 06 02 b5 Oxaa 30 aa 02 00 ac OK Wait for OK Page 9 of 9 Rev 2 01 7 0x07 GPIO input C6810 Users Manual ID 0x07 Description Enable or disable GPIO input ID Command Oxaa 03 07 p1 checksum Parameter P1 0x00 off 0x01 on Operation Mode Preview mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Enable GPIO input Host Oxaa 03 07 01 b5 Wait for OK Module Oxaa 30
4. aa 0200ac OK 8 0x08 GPIO output ID 0x08 Description Enable or disable GPIO output If the active channel has a motion detected it will output an active low signal to Alarm Out user can connect it to trigger external device such as siren Note this feature is only active at motion detect on ID Command Oxaa 03 08 p1 checksum Parameter P1 0x00 off 0x01 on Operation Mode Preview mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Enable GPIO output Host Oxaa 03 08 01 b6 Wait for OK Module Oxaa 30 aa 0200 ac OK 10 0x0a Get Version ID 0x0a Description Get the firmware version of the module ID Command Oxaa 02 0a b6 Parameter n a Operation Mode Preview mode Return from Module Oxaa Oa pl p9 checksum pl p9 is the version of the module in ASCII Example Get the version Host Oxaa 02 0a b6 Wait for Response Page 10 of 10 Camera Oxaa 30 aa 0a 36 38 31 30 20 76 31 30 31 f7 Command Length 0a 36 38 31 30 20 76 31 30 31 version of the module f7 checksum Rev 2 01 C6810 Users Manual 16 0x10 Select the operation mode ID 0x10 Description Select the operation mode preview or playback Note all system configuration and capture function is operated within preview mode File management is operated under playback mode If operate under wrong working mode it will f
5. 0 01 dO dn checksum aa 0xaa 30 aa nn nn dO dn checksum aa Detail explanation of command and return from module can be referred to the command list in the following pages Page 5 of 5 Rev 2 01 5 Summary of Commands C6810 Users Manual System Configurations ID in Dec ID in Hex Function 00 00 Get module status 01 01 Set the system clock 02 02 Request the system time 03 03 Select the TV Standard NTSC PAL 04 04 Format the storage media 05 05 Motion Detect set on or off 06 06 MD sensitivity set HML 07 07 GPIO Input enable or disable 08 08 GPIO Output enable or disable 10 0a Get Version Operation 16 10 Set operation mode preview or playback 17 11 Request current mode 18 12 Channel select select ch1 to 4 19 13 Manual capture JPG or AVI JPG Capture 32 20 Set the compression ratio HML 33 21 Set Intervals between MD 1 99 sec 34 22 Set number of shot per trigger 1 9 AVI Capture 37 25 Set the compression ratio of the AVI recorded 38 26 Set the duration of AVI capture 1 99sec 39 27 Set frame rate 1 15fps File Management 48 30 Get current file information 49 31 Get current file content 50 32 Select a particular file 51 33 Select the Previous Next file 52 34 Playback the current AVI 53 35 Set packet size 54 36 Download current file from the Module 55 37 Delete file curren
6. 0 ac Page 7 of 7 Rev 2 01 C6810 Users Manual 2 0x02 Request the system time ID 0x02 Description Request the system time ID Command Oxaa 02 02 ae Parameter n a Operation Mode Preview mode Return from Module Oxaa 08 P1 P2 P3 P4 P5 P6 P7 Checksum P1 P2 Y3Y Y Yo Year in hex P3 MMe Month in hex P4 DD Day in hex P5 H Ho Hour in hex P6 MmijMio Minutes in hex P7 S So Second in hex Oxaa 01 Failed Example Request the system time Host Oxaa 02 02 ae Wait for Response Module Oxaa 30 Oxaa 08 07 d5 04 OF 17 1e 05 DB aa 02 00 ac Length of the command 6 bytes Return 0x07d5 Year 2005 0x04 Month 04 OxOf Day 15 0x17 Hour 23 Oxle Minute 30 0x05 Second 05 2005 04 15 23 30 05 Checksum Oxdb 3 0x03 Select the TV Standard ID 0x03 Description Select the TV Standard Parameter NTSC PAL ID Command Oxaa 03 03 p1 Checksum Parameter P1 0x00 NTSC 0x01 PAL Default Operation Mode Preview mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Select NTSC as the TV standard Host Oxaa 03 03 00 b0 Wait for OK Module Oxaa 30 aa 0200ac OK Page 8 of 8 Rev 2 01 4 0x04 Format the storage media C6810 Users Manual ID 0x04 Description Format the storage media ID Command Oxaa 02 04 bO Parameter n a Operation
7. C6810 JPEG Module w UART Interface User Manual Note this user manual apply for the firmware version of V2 00 o COMedia rol Rm 802 Nan Fung Ctr Castle Peak Rd Tsuen Wan NT Hong Kong Tel 852 2498 6248 Fax 852 2414 3050 Email sales comedia com hk http Awww comedia com hk C6810 Users Manual Table of Content Hardware 1 Understand the connectors esee ehenet eset enne nh ener sess eene tesis eese 3 1 1 Pin description of connectors 2 Moule Speciticaigi sen Udo ud inui odia rM UI A IS ED 3 2 1 Electrical Characteristics ceret eterne eet erae eee rera earn aeuo ead 3 Software 4 Send Command to M d l sisena a a eene a etse sentent E 4 3 Definition of Command 3 1 1 ID Command 3 1 2 ACK Command 4 Get Data Trom Module iiie s E ERREUR AU INSERERE E TU etal aas 5 DSU ALY of Command Meer 6 Gz Eistot Command aae eee oa ales a a E A Appendix ASCH eode tables ioo aot tu d pde np ates VIAL ROI UM EUR dua 18 Documentation Change E09 hcg cote ieee te di eee dt tu iuo d o Bae deca ups 19 Page 2 of 2 Rev 2 01 C6810 Users Manual Hardware 1 Understanding the connectors J2 Video output 2 pin connector connect to TV video input Alati Out J3 Video and DC input 6 pin connector 4 ad lt for 4 channel video signal input DC Video Out 4 2 input 5V z J4 Trigger input 5pin connector
8. M 108 06C 047 02F 078 04E N 109 06D m 048 030 0 079 04F O 110 06E n 049 031 1 080 050 P 111 06F o 050 032 2 081 051 Q 112 070 p 051 033 3 082 052 R 113 071 q 052 034 4 083 053 S 114 072 r 053 035 5 084 054 T 115 073 S 054 036 6 085 055 U 116 074 t 055 037 7 086 056 V 117 075 u 056 038 8 087 057 Ww 118 076 v 057 039 9 088 058 X 119 077 w 058 03A 089 059 Y 120 078 x 059 03B 090 05A Z 121 079 y 060 03C lt 091 05B 122 07A Zz 061 03D 092 05C Page 18 of 18 Rev 2 01 C6810 Users Manual Document Change Log 1 first released on June 5 2007 2 V2 0 released on July 3 2007 2 1 change data download method add packet size 2 2 add get module status 2 3 add operation mode to the command description 2 4 add ASCII code table 3 V2 01 released on July 13 2007 3 1 Add note for some commands Page 19 of 19 Rev 2 01
9. a 0200ac OK Wait for OK Page 15 of 15 Rev 2 01 C6810 Users Manual 52 0x34 Playback the current AVI ID 0x34 Description Playback the current AVI if current file is AVI ID Command Oxaa 02 34 e0 Parameter n a Operation Mode Playback mode and the current file is AVI Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Play the current AVI Host Oxaa 02 34 e0 Wait for OK Module Oxaa 30 aa 0200ac OK 53 0x35 Set the packet size ID 0x35 Description Set the packet size before Download current file It can be any size but note the connection should be affordable if the size is too big ID Command Oxaa 04 35 pl p2 checksum Parameter p1p2 packet size Operation Mode Playback mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Set packet size 61000 Host Oxaa 04 35 ee 48 19 Wait for OK Oxaa 30 aa 0200ac OK 54 0x36 Download Current File ID 0x36 Description Down load current file ID Command Oxaa 04 36 p1 p2 checksum Parameter plp2 package number Operation Mode Playback mode Return from Module Oxaa pl p2 dO dn checksum 16bit Oxaa plp2 packet number dO dn is image data Note there is the sync byte Oxaa follow the checksum to indicate the end of data return Also note that dO dn is one packet data equal to the packet size set i
10. correctly 3 1 Definitions of Commands The commands are string of the hexadecimal number it consists synchronization bit and check bit There are 2 types of commands ID Command and ACK Command Synchronization byte 0xaa is placed at the front of command used for the synchronization between the host machine and the Module Checksum Byte is equal to the lowest 8 bit of the summation of all the other bytes in the command It is used for the verification of the command 3 1 1 ID Command is a variable length command containing the sync byte length of the command command ID and Checksum The format of ID command is shown in the following Format Sync Byte Length of the command Command ID in Parameter N Checksum 8 bits 8 bits HEX 8 bits 8 bits x N 8 bits Example Oxaa 0x03 0x12 0x03 Oxc2 display ch3 Explanation Sync Byte Oxaa as described before Length of the command this is to tell the module how many bytes to be followed In the example there are 3 bytes following the 2 byte so we tell the module there are 3 bytes to be followed in this command we assign 0x03 for this byte Command ID refer to the command list in this document In the example the command ID 0x12 is for channel selection Parameter each command may follow different numbers of parameters may be 0 or many In this case one parameter Channel 3 If there are more parameters the 2 byte length of command
11. eed back by mode error ID Command Oxaa 03 10 p1 checksum Parameter P1 0x10 preview 0x11 playback Operation Mode Preview playback mode Return from Module 0x00 OK 0x01 Failed Example Select Playback as the operation mode Host 0xaa 03 10 11 ce Wait for OK Module Oxaa 30 aa 02 00 ac OK 17 0x11 Request the current operation mode ID Ox11 Description Request the current operation mode ID Command Oxaa 02 11 bd Parameter n a Operation Mode Preview playback mode Return from Module Ox10 preview mode 0x11 playback Mode Follow the status 0x00 OK 0x01 Failed Example Request the current operation mode Host Oxaa 02 11 bd Wait for Response Module Oxaa 30 aa 02 10 be 10 preview 11 playback Mode aa 0200ac OK Page 11 of 11 Rev 2 01 18 0x12 Channel Select C6810 Users Manual ID 0x12 Description Set channel as operation channel ID Command Oxaa 03 12 p1 checksum Parameter P1 0x01 chl 0x02 ch2 0x03 ch3 0x04 ch4 Operation Mode Preview mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Set channel to 3 Host Module Oxaa 03 12 03 c2 Oxaa 30aa 02 00ac OK Wait for Response 19 0x13 Manual Capture ID 0x13 Description Snap shot a JPG or Capture AVI as per setting ID Command Oxaa 03 13 p1 checksum Paramete
12. n 0x35 0x01 Failed 0x50 Mode error Example Download first packet of current file Download package 1 Host Oxaa 04 36 00 00 e4 Wait for OK Module Oxaa 30 aa 00 00 ff d8 20 43 4f 2e aa note last aa is the sync byte Page 16 of 16 Rev 2 01 55 0x37 Delete file C6810 Users Manual ID 0x37 Description Delete file s ID Command Oxaa 03 37 p1 df Parameter P1 0x00 current file 0x01 all files Operation Mode Playback mode Return from the Oxaa 05 pl p2 q1 q2 checksum Module p1 p2 the current file s number q1 q2 the total file s number Follow the status 0x00 OK 0x01 Failed 0x50 Mode error Example Delete all files Host Module Oxaa 03 37 01 e5 Oxaa 30 aa 05 00 00 00 00 b1 Wait for OK 00 00 the current file s number 00 00 the total file number aa 02 00 ac OK Page 17 of 17 Rev 2 01 C6810 Users Manual Appendix ASCII code table Dec Hex Character 062 03E gt 093 05D 032 020 SP 063 03F 094 05E 033 021 064 040 e 095 05F 034 022 065 041 A 096 060 035 023 066 042 B 097 061 a 036 024 067 043 C 098 062 b 037 025 926 068 044 D 099 063 C 038 026 amp 069 045 E 100 064 d 039 027 070 046 F 101 065 e 040 028 071 047 G 102 066 f 041 029 072 048 H 103 067 g 042 02A 1 073 049 104 068 h 043 02B 074 04A J 105 069 i 044 02C 075 04B K 106 06A j 045 02D 076 04C L 107 06B k 046 02E 077 04D
13. r Command n a Operation Mode Playback mode Return from Module Oxaa 12 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P1 checksum 1 P12 P13 P14 P15 P16 P17 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 file name in ASCII P14 P15 P16 P17 file size Follow the status 0x00 OK 0x01 Failed 0x50 Mode error Example Get current files in memory Host Oxaa 02 31 dd Wait for Response Module Oxaa 30 aa 12 49 4D 47 30 30 30 31 2E 4A 50 47 00 00 00 06 0A AB 24 49 4D 47 30 30 30 31 2E 4A 50 47 00 00 file name 00 06 0A AB file size395947 aa 0200ac OK 50 0x32 Select a particular file ID 0x32 Description Select a particular file as current file ID Command Oxaa 04 32 pl p2 checksum Parameter P1 higher byte of file no P2 lower byte of file no Note max no of file is 1024 if SD card is existed Operation Mode Playback mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Select the file of that the ID is 01 1 file Host Module Oxaa 04 32 00 01 e1 0xaa 30 aa0200ac OK Wait for OK 51 0x33 Select the Previous Next file ID 0x33 Description Select the Previous Next file ID Command Oxaa 03 33 p1 checksum Parameter P1 0x00 Previous 0x01 Next Operation Mode Playback mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Select the next file Host Module Oxaa 03 33 01 el Oxaa 30 a
14. r P1 0x00 JPG 0x01 AVI Operation Mode Preview mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Perform a snap shot Host Module Oxaa 03 13 00 c0 Wait for Response Oxaa 30 aa 02 00ac OK 32 0x20 Set compression ratio for JPG ID 0x20 Description Set compression ratio for photos ID Command Oxaa 03 20 p1 checksum Parameter P1 0x00 low 0x01 medium 0x02 high Note compression ratio low means better image quality and bigger file size Operation Mode Preview mode Return from Module 0x00 ok 0x01 failed 0x50 Mode error Example Set compression ratio to High Host Oxaa 03 20 02 cf Wait for Response Module Oxaa 30 aa 02 00 ac Page 12 of 12 Rev 2 01 33 0x21 Set interval between MD C6810 Users Manual ID 0x21 Description Set interval between triggers by motion detected when MD enabled It means during this period the trigger is ignored Note this is only effective for the still picture capture not for video recording ID Command Oxaa 03 21 p1 checksum Parameter P1 Oxnn nn 1 99sec in hex Operation Mode Preview mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Set interval to 5 sec Host Oxaa 03 21 05 d3 Wait for Response Module Oxaa 30 aa 02 00 ac 34 0x22 Set no of shots per trigger ID 0x22 Descrip
15. t or ALL Page 6 of 6 Rev 2 01 6 List of Commands 0 0x00 Get status of the module C6810 Users Manual ID 0x00 Description Get status of the module ID Command Oxaa 02 00 ac Operation Mode Preview playback mode Parameter n a Return from the Module Oxaa Od p1 p2 p3 p4 p5 p6 p7 p8 p9 p11 p12 checksum motion detect on 1 off 0 P2 P3 GPIO Output on 1 off 0 Channel Select ch1 1 ch2 2 ch3 3 ch4 4 Jpeg Ratio Hi 2 Mid 1 Low 0 Interval Capture Num AVI Ratio Hi 2 Mid 1 Low 0 P1 P4 MD sensitivity Hi 2 Mid 1 Low 0 GPIO Input on 1 off 0 P10 Frame Rate P11 Duration P12 Set TV standard NTSC 0 PAL 1 Oxaa 01 Failed Example Get status of the module Host Oxaa 02 00 ac Wait for reply Module Oxaa Od 00 02 01 01 01 00 05 03 01 05 05 01 d3 1 0x01 Set the system clock ID 0x01 Description Set the system clock ID Command Oxaa 09 01 P1 P2 P3 P4 P5 P6 P7 Checksum Operation Mode Preview mode Parameter P1 P2 Y3Y gt Y Y Year in hex P3 P4 P5 P6 P7 M Mo Month in hex D Do Day in hex H Ho Hour in hex Mi Mip Minutes in hex S So Second in hex Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Set the system clock to 2004 11 19 18 10 00 Host Oxaa 09 01 07 d4 Ob 13 12 0a 00 c9 Wait for OK Module Oxaa 30 aa 02 0
16. t will NOT ack anything Note some commands need to take time for execution so need to make sure it is available before sending the other command Otherwise it will encounter the machine hang problem If motion detect ON need to turn it OFF before sending other command Otherwise it will be always activated and not response to other command Page 4 of 4 Rev 2 01 4 Get Data from the Module Before getting image data from the module one needs to get the relative file information the total files and which file want to down load Then set the desired file to current get the file information such as file name size After that one can set the packet size and calculate the no of packet to get the data accordingly Below is the flow of the operation Note this operation is valid at playback mode only Host Get system file information gt Oxaa 02 30 dc Get current file information gt Oxaa 02 31 dd Set Packet size gt 0xaa 04 35 pl p2 checksum Download 1 packet 73 0xaa 04 36 00 00 e4 Download 2 packet gt 0xaa 04 36 00 01 e5 Download n packet gt 0xaa 04 36 nn nn checksum C6810 Users Manual Module 0xaa 30 aa 05 plp2 p3p4 checksum p1p2 total no of file p3p4 no of current file 0xaa 30 aa 12 pl p17 checksum pl p13 file name in ASCII p14 17 file size 0xaa 30 aa 02 00 ac ack 0xaa 30 aa 00 00 dO dn checksum aa dO dn data aa after checksum is sync bit 0xaa 30 aa 0
17. tion Set number of snap shots per trigger when motion detection It can do multi shots when it is activated by MD ID Command Oxaa 03 22 p1 checksum Parameter P1 Oxnn nn 1 9 default is 1 Operation Mode Preview mode Return from Module 0x00 OK 0x01 Failed 0x50 Mode error Example Set 5 shots per trigger Host Oxaa 03 22 05 d4 Wait for Response Module Oxaa 30 aa 02 00 ac 37 0x25 Set compression ratio for AVI ID 0x25 Description Set compression ratio for video clip ID Command Oxaa 03 25 p1 checksum Parameter P1 0x00 low 0x01 medium 0x02 high Note compression ratio low means better image quality but bigger file size Operation Mode Preview mode Return from Module 0x00 ok 0x01 failed 0x50 Mode error Example Set compression ratio to High Host Oxaa 03 25 02 d4 Wait for Response Module Oxaa 30 aa 02 00 ac Page 13 of 13 Rev 2 01 C6810 Users Manual 38 0x26 Set Duration of recording AVI ID 0x26 Description Set duration of video clip per trigger ID Command Oxaa 03 26 p1 checksum Parameter P1 Oxnn nn 1 99sec in hex Operation Mode Preview mode Return from the 0x00 OK Module 0x01 Failed 0x50 Mode error Example Set duration to 15 sec Host Module Oxaa 03 26 Of e2 Oxaa 30aa 0200 ac OK Wait for Response 39 0x27 Set frame rate of AVI
18. will be different Checksum The sum of the command is AA 03 12 03 c2 so Checksum is Oxc2 3 1 2 ACK Command is a variable length command containing the acknowledgement and the results returned for the ID command Similar to ID command it contains also the length of the results and check bit for verification The format of ACK Command is shown in the following Format Sync Byte Length of the Return variable Checksum 8 bits command 8 bits 8 bits Example Oxaa 0x08 0x07 Oxd5 0x04 0xOc 0x11 0x36 Oxe5 Request the 0x00 system clock 2005 04 12 11 54 00 If the ID command is received correctly and proceed to action the module will send Oxaa 30 to acknowledge host Means the module has received the command tell host to wait for further ACK command There are 3 types of fail message return from the module 1 If the checksum of the ID command is not received correctly the module will acknowledge the fail message Oxaa 02 01 ad Such case no Oxaa 30 will be sent before the acknowledgement 2 Ifthe ID command is received correctly but the module cannot execute correctly it will send Oxaa 30 before the error code Oxaa 02 01 ad 3 If the command is correct but not valid for the operation it will return mode error Oxaa 50 to acknowledge host For instance at playback mode you ask it to do a snap shot it will return mode error 4 The worst case if there is not the correct command format or command not existed i
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