guytas2

Hi, I'm using a DVR from Hikvision, model DS--7308HQHI-SH with a PTZ camera (noname) that is compatible with the commands over coax PTZ Protocol HIKVISION-C.. The camera and image clarity is just fine. But the PTZ works less than half the time. I cannot pinpoint what is causing it to work or to fail. And this is like that for years but I'm fed up with the problem and I want to get this working properly. The coax is about 100 feet. And I already replaced it with a better quality and that made no change. Rebooting the DVR or the camera does not fix the problem. When the problem happens, it simply doesn't move or zoom. And this can stay faulty for 30 minutes, or days... Sometimes, when it works, it can work for a few minutes only. Soon or later it'll stop moving. I only have one camera with the PTZ functions so I cannot compare. But I have one camera that I can control its zoom in the same way (HIKVISION-C protocol) and that one always work. Anyone has an idea what I can look for? There is no error code or anything anywhere so it is hard to investigate... Unless there is a way in the Hikvision DVR to see a log or some sort.

my god... You seems to think that I'm a twit or something. And you don't seems to know anything about that protocol. I wanted hikvision, and I wanted to use this protocol. I will not change that. I'm a engineer, programmer, and retired electronic technician (TV and computer) but speak french, so may be I'm not explaining things correctly in English, but I thought I was not so bad. But you're right... this is point less. My first question was related to an intermittent problem with this protocol and I'm searching how to investigate the problem so I can correct it. Sorry I took your time.

OK, this is in the camera. And the mode AUTO cannot be changed. You seems to think that the baud rate matters... But it is not selectable when the HIKVISION-C is selected. Anyway, if the baud rate would matter, it would not work at all if the baud rate would be wrong. I have performed the COMM RESET and it made no difference after it finished rebooting.

ok, I might be on something.... I got communiation right now. And if I go in the COMM menu, the cursor is sitting on CHECK ID 807908 There are the folliwing options on that menu (but I cant get doen to them) TARGET ID 001 SOFT PROTOCOL AUTO BAUD RATE 2400BPS COMM RESET SAVE EXIT but the cursur stays on the CHECK ID line. I can change that value but it doesn't affect anything else

When I reboot the camera, it shows PROTOCOL:AUTO, communication 2400,N,8,1 But still cannot access it at this moment

ha... It'll have to wait I just discover that the menu is also not working sometimes. I'll keep checking until the menu works. But I dont get it. What exactly you want me to check in the menu? Because when it start working, it does work fine. By the way... thanks for helping... (in case I forget later on)

It is TVI yes. And the baud rate is not selectable when the protocol is set to HIKVISION-C. But what I would like to know is how to investigate on problems with commands over coax? Pelco also have a similar protocol. Actually, HIKVISION-C is supposed to based on that pelco COAXITRON. If it was 485, it would be so simple to check... you put the scope on the line and you see the signal and you can calibrate the terminal resistors properly, and then you put a computer with a 485 interface and you can monitor the exacts commands. But what can I check with this protocol? Tapping the coax cable you can see the video signal but what? I wish I could see the commands arriving at the camera and see if they are OK. Looking at it right now, it is working just fine. I can move in any direction I want without any problem. But soon or later it will stop.

I was trying to get away from that The cable is under ground (and under snow right now).

nope... You're wrong.... The address is used to find the camera on a RS-485 line (I have created several devices using RS-485 in the past, to access cash registers) But like I said, the commands are sent via the coax cable on the same coax as the image video. When the HIKVISION-C protocol is selected, all the fields to enter the addresses and baud rate are grayed out as it is not used by this protocol.

Only one with full PTZ. The other one only have a zoom control. I do not use RS-485 so there are no addressing. The HIKVISION-C protocol is a command over coax type of communication.