andyh747

The above model was purchased many years ago so I realise this is a long shot. I've set this unit up for a neighbour. It was working fine when I used it about a year ago and had been running perfectly for many years. However it now refuses to save the configured settings after reboot. Everytime the unit is rebooted it returns to defaults. Although not necessary for saving the settings, I replaced the onboard clock battery just in case but no luck. I would like to flash the firmware but I cannot find any firmware anywhere for this unit as it's so old. I'm not sure what model of Dahua this actually was as it was rebranded under QVIS. Can anyone help with a suitable firmware file or suggest anything else I can try to fix this issue? Have attached flyer for the model in question. I-APOPRODC_V1.pdf

I would also like to know if there's a list of commands which can be sent via telnet to the DVR. I would like the ability to change the display output so you can show the different views output to the HDMI interface. This should be a straight forward command set. Any pointers appreciated.

Very useful info. Many thanks. That might explain the problem. I'll investigate to see if mine have the same chipset. Thanks.

Think you're mixing up the camera model. These cameras where £160 each plus VAT (currently 20%) here in the UK. Equivalent in dollars would be around $320! So in that case yes I would expect them to honour a five year guarantee and I would expect cameras of this quality to last in excess of five years - all mine are just over four years old.

Thanks for reply. Yes that's true but these cameras are supposed to have a five year guarantee so I'm hoping they might be covered under this. I've just replaced one with a new Concept Pro and the difference is startling especially at night. Will see what the supplier says regarding the guarantee.

Hi all, Posted this in the video surveillance forum but got no response. Thought I'd try here I've had nine Concept Pro (CNB) analogue cameras installed for about four years (VVP9324DNIR). They have been excellent but I'm having a couple of issues. One camera is now showing an almost black screen at night. Having checked the IR LEDs these seem to be working ok. It looks like the camera is failing to switch to black and white and is staying in day mode. It is working ok during the day but not at night. The camera has a five year warranty so I can return it but wanted to check if there was anything I can do first to fix the problem? Second issue is a problem with two of the cameras during the day (the one mentioned above being one of them). When the sun is shining on the camera the picture is completely obscured due to being far too bright. I hadn't noticed this last year but it seems really bad this year. I haven't tried adjusting any settings yet but wonder if this is normal when cameras get direct sunlight and whether there is anything I can do to ease/solve the problem. Thanks for any help.

Anyone any advice on this? Have tried adjusting settings but the camera is not switching to night mode and is not adjusting to bright sunlight.

Hi all, I've had nine Concept Pro (CNB) analogue cameras installed for about four years (VVP9324DNIR). They have been excellent but I'm having a couple of issues. One camera is now showing an almost black screen at night. Having checked the IR LEDs these seem to be working ok. It looks like the camera is failing to switch to black and white and is staying in day mode. It is working ok during the day but not at night. The camera has a five year warranty so I can return it but wanted to check if there was anything I can do first to fix the problem? Second issue is a problem with two of the cameras during the day (the one mentioned above being one of them). When the sun is shining on the camera the picture is completely obscured due to being far too bright. I hadn't noticed this last year but it seems really bad this year. I haven't tried adjusting any settings yet but wonder if this is normal when cameras get direct sunlight and whether there is anything I can do to ease/solve the problem. Thanks for any help.

There is a major flaw with IR on my system. I have an IR pass through system which allows IR control of the DVR from another room. However the Dahua reacts to other IR remotes I have for a PVR and an AV receiver. That means if I send a signal to my amp or pvr things change on the DVR! Not ideal. Manufacturs aware but no fix as yet. Only workaround I have found is to change the remote ID to one different to that set on the DVR and only enable it again when control of DVR required. That's why I'm looking for an alternative control method.

So Dahua don't produce a code set for RS232 comms? Makes finding the correct codes a little tricky! I know it's possible using a packet sniffer but its a bit of a chore. Considering that the keyboards can communicate with the DVR using RS232 its a pity Dahua don't release the command protocols.

After doing a little more investigation I think the best method would be using RS232. However I need a list of the RS232 codes to control the DVR. I know this port is usually used for a keyboard but I want to send the codes direct for control. Anyone have a list of RS232 codes?

Control of the DVR from an iPad. Instead of using the IR which is line of sight I want to be able to change the screen display wherever I am in the house. The DVR is in a control room with other equipment but the output is piped to all TVs in the house. Therefore it would be useful to control it from any room so I can change screen display, playback etc.

Hi All, I'm looking to control my DVR directly over the Ethernet interface using a universal control app on an iPad. The app allows you to control any device by utilisng direct IP commands. I already have the iPad app to view and playback but this is not what I want to do. I want to have control of the DVR front panel by using direct commands sent via the network. I know there is a facility for doing this via a PC and I assume this is using IP to send the commands needed. Does anyone know what the command protocols are for direct IP control of a Dahua DVR? I know I could use IR via a universal blaster but using IP would be much better. Thanks.

Further to the above. The DVR has four BNC inputs for audio on channels 1-4. Audio input for the other channels is via DB25 input. Can anyone help with a suitable connecting cable for this? Ideally it would be good to have a DB25 to phono connection to connect the mic or mics to the relevant channels. There's no info from Dahua that I can find which shows the pin designations for this connector. Thanks for any pointers.

It depends if the camera is IP or analogue. If analogue will be connected to a Dahua DVR. Already have one external PTZ running on that and control is a breeze. If its IP I'll be using a Synology NAS with built in surveillance station. Again used this before and has been faultless. Have found a couple of candidates namely: SK-V207IR/Z946 (available from RF Concepts). However it's not the smallest. Other one I've looked at is: http://www.broadbandbuyer.co.uk/Shop/ShopDetail.asp?ProductID=13028 However again not an ideal form factor. Also looked at this one but not sure about quality: http://www.cctvdiscover.net/index.php?option=com_content&view=article&id=115:je-9604ir&catid=61:mini-ptz-camera&Itemid=87