Reading RS232 give's unknow text

Rudie

Rudie

n3wb
Nov 19, 2021
4
1
Netherlands
Hello,


I want to reset the admin user on my Dahua recorder using the rs232 port.
I connected my laptop to the rs232 port and using NCOM to read the boot proces when the recorder is starting up.

But it give's unknow symbols.



Çp2
ÆofHþõÿÞµßÏçÖ¨Î4ßGŽ…OÚÞ£âo’=ßâckNÖoŽ^Øÿgïßhÿ×ñŠrRνcÃöJÁ£ãvÐFZÂk”«Ô«÷çþïÆæïAoýAÃ΢ k$dÞl#ö)Þ÷dÎþßœ„çΆveîó?„•ëŒ¤g•ÏÄ@æÖïÏ߃
€Ôk+uq΢2—ÿG6ïãæÞkPÞ#öÖiè½ïï÷@æmæ® Ì®bLÏDfï
{cŽ-¯Y¯{ïϯsì{ìÓ koïû¯æ®"fæmßcÃsGg@ûÊîfßkïhs‚¾{©Y„/1c;ïoï¦[{ì¡Aï×sCÎÏ¥cÿNÖcfî뢮Öó{‚ï{æï{‚ïçFCÅ{kûŒcÂêcäADA{O{{ÂþïÖ†öå×îk!¤aÕßks¬ãªÇcÅfÇà€ÞÁïç®Íæ†ÍìOŸ+óà 0ckæ¯î`Â{î®Çi4{ËskâÖs{LCµ*íV©ÀÆãFnssÃ÷ÎcÊÿkjænÏ{{£k̃ÃFïskŽïά¯wûkFÆ<I¥B8–pëïZëï#[HqK½{nÆ ½ù¿x9+q?xoo™Ä0Z4Æx8½zh+0Úˆ»Z
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I can't make sense of it.
 
Could be the terminal emulation type too. I'm not sure what the NVR's call for off-hand.
 
Are you using 115200 for baudrate and 8,N,1 ( 8 data bits, no parity, 1 stop bit) and no flow control?
 
Rudie said:
I connected my laptop to the rs232 port
Click to expand...
To the back panel of the (unspecified) NVR?
Unusual to have an RS232 interface on a laptop.

Or to the serial console on the main board?
Which would be a TTL serial interface., not RS232.

What type of interface are you using on the laptop?
 
I used NCOM and Putty.

The setting i used are:
baudrate: 115200, 57600, 38400, 19200, 9600.
8 Databits
1 stopbit
No flow control

The character set is: UTF-8

The recorders model DHI-NVR4104-P-4KS2-UK

My laptop has an serial interface (DB-9) connector.
I connect it to the motherboard of the recorder, using a DB-9 connector to JST-4 connector
 
The recorder needs serial TTL, not RS232.
These have different signal types.
You need a USB to serial TTL converter such as a PL2303TA based device or similar.
 
Its working know.

It was indeed TTL.
I used Putty and a USB to TTL converter.

Then you can read the system/bootloader.
From here you can default the recorder.


When you use a converter such as a PL2303TA based device or similar.
U need an old USB Driver version 3.3 (not higher) because higher isn't supported by windows 8 and higher.

Futher information and download:

The Famous Old Driver of PL2303 USB – Embedded Area

embeddedarea.com embeddedarea.com



close topic.
 
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Rudie said:
Its working know.
It was indeed TTL.
Click to expand...
That's good!

Rudie said:
When you use a converter such as a PL2303TA based device or similar.
U need an old USB Driver version 3.3 (not higher) because higher isn't supported by windows 8 and higher.
Click to expand...
It sounds like someone sold you a PL2303HX or similar device that only works with the old driver.
The PL2303TA device driver works OK for Win10.
 
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