"BS2 with or without an RS232 level translator? "
Um, I don't know.  It is an old BS2 from way back when they were newish.

I am sorry, I should have been more clear on what I meant by "4800 baud 
8,n (non-inverted) "
I know that n does not stand for non-inverted.  I meant, 4800bps, 8 data 
bits, no parity, non-inverted.

Then camera blocks are no addressable.  When the dome camera sends 
commands that are exactly as the PDF describes them.  I can sniff the 
data sent from the dome to the camera block using the above baud 
settings.  So I would think I should be able to send the exact same data 
from the BS2 using the exact same Baud settings.  But that does not work 
for some reason. 


> I finally got the PDF to download. Sloooowwww

Sorry, my cable modem's upstream can get all choked up sometimes.  :-)

>
> Seems to be a very simple protocol.
> Set your port to 4800,N,8,1.
> Send commands using hyperterm.
> They must be prefixed with ":" or "/". They are case sensitive.
> You can send only ONE command per field. e.g 1/50 or 1/60 second.
> Zoom commands require 6 fields spacing.

Being the camera is RS-232C and that it seems to need non-inverted data, 
I suppose that totally rules out directly connecting a PC com port to 
the camera doesn't it?

>
> The camera will echo back all commands.
> Do you SEE the echo?? If not, then it's not listening to you.

I will set it up so I can monitor the echo and I will post my results here.

> Are you using the correct baud rate since the camera can
> be commanded to change baud rates?

I am pretty sure I am using the correct baud rate because I have not 
tried to change it and I am able to sniff the data the dome cam sends 
using the above baud rate that the camera does respond to.


   -Dan



>
> Dan Gliebe wrote:
>
>> Does anybody here know anything about camera blocks and sending 
>> serial data to them?  I have a Hitachi VK-S274 color camera block, 
>> commonly used in PTZ Dome cameras.  I have the datasheet with the 
>> serial protocol here..  
>> http://ip.gliebetronics.com:800/hitachi/S274R_Comm_E11.pdf  It is 
>> simple enough, but I just can't seem to get the camera to do anything 
>> when I send commands.
>>
>> A friend and I have tried sending data to the camera block using a PC 
>> com port and using a BS2.  I found that I can successfully capture 
>> data at 4800 baud 8,n (non-inverted) that is sent to this camera from 
>> a SpeedDome Ultra V dome camera.  I just can't seem to send data to 
>> the camera and make it do anything.  We're rather confused and any 
>> tips or advice would be greatly appreciated.  Can a PC Com port send 
>> non-inverted data?  Maybe I need some sort of serial interface chip?  
>> What does non-inverted really mean?.. since inverted captured only 
>> garbage.
>>
>> Thanks for any advice, suggestions, and ideas.  :-)
>>
>>   -Dan
>>
>>

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