dahua nvr require specific serial cable?

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wozzzzza

Pulling my weight
Jan 5, 2015
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i got a prolific serial cable with gender adaptor from local electronics shop, as that was all they had, to try and unbrick my nvr but it doesnt work, i tried with another known working nvr and nothing again, using securecrt and it displays nothing at all when i connect cable to it and laptop and set baud rate of cable and securecrt to 115200 and restart nvr, blank screen.
do i need a specific cable?
 
Take the cable RX and TX put them together and type anything on the keyboard does it show what you typed? Like if you press 0000 does it show up? If not then the cable isn't connected to right port or isn't a good cable.. I bought 3 some years ago and only 2 of them were good. I had to take one apart and flow some new solder on some of the parts of the device to get it to come to life..
 
Revo2Maxx said:
Take the cable RX and TX put them together and type anything on the keyboard does it show what you typed? Like if you press 0000 does it show up? If not then the cable isn't connected to right port or isn't a good cable.. I bought 3 some years ago and only 2 of them were good. I had to take one apart and flow some new solder on some of the parts of the device to get it to come to life..
Click to expand...
yes did that and it works fine.
 
The sound like the system will need to be looked over for some other type of issue. Wrong Uart, Hard Brick device that is so bad it hasn't initialize Uart? Power circuit bad? Wrong Uart speed? Also maybe your using Wrong 5v Uart device on 3.3v Uart system?
 
I don't know, Without seeing the PCB, The Uart device, knowing if your device is OEM or pure Hikvision. There are some people OEM and Hik both that lock out the Uart. At times there might be something on the PCB that will let you get the info needed and other times no. Not all area built equal.

Sorry wasn't more help.
 
wozzzzza said:
i got a prolific serial cable with gender adaptor from local electronics shop,
Click to expand...
Does this mean that the (unspecified) model of NVR has a DB9 connector on the back panel?
If so, the 'gender adaptor' must convert the connections of the usual RS-232 serial interface to those of a 'null-modem' cable, in particular swapping pins 2 & 3 around.
If you have a multimeter it would be worth checking that the adaptor has done that.
 
alastairstevenson said:
Does this mean that the (unspecified) model of NVR has a DB9 connector on the back panel?
If so, the 'gender adaptor' must convert the connections of the usual RS-232 serial interface to those of a 'null-modem' cable, in particular swapping pins 2 & 3 around.
If you have a multimeter it would be worth checking that the adaptor has done that.
Click to expand...
yes db9 connector.i will check later, so maybe the tx and rx are around the wrong way??
 
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alastairstevenson said:
Does this mean that the (unspecified) model of NVR has a DB9 connector on the back panel?
If so, the 'gender adaptor' must convert the connections of the usual RS-232 serial interface to those of a 'null-modem' cable, in particular swapping pins 2 & 3 around.
If you have a multimeter it would be worth checking that the adaptor has done that.
Click to expand...
its a NVR608H-32-XI
i checked the adaptor and pins 2 and 3 and 5 all come out the other side how they should do.
any other ideas?
 
To make it almost like a null-modem connection, pins 2 and 3 needed to be reversed. If 2 goes to 2 and 3 goes to 3 on the adaptor the interface adaptor will not connect to the serial console.
 
alastairstevenson said:
To make it almost like a null-modem connection, pins 2 and 3 needed to be reversed. If 2 goes to 2 and 3 goes to 3 on the adaptor the interface adaptor will not connect to the serial console.
Click to expand...
so you saying get some wires out and make up some connectors and swap pins 2 and 3 and see what happens then?
 
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