The problem in the protocol identification

Discussion in 'General Electronics Chat' started by mohammad2050, Nov 14, 2014.

  1. mohammad2050

    Thread Starter Member

    Nov 14, 2014
    56
    1
    hi
    I have a device that has a communication port but I do not know which type of protocol.
    I've measured the voltages on pins , that The following values were obtained :
    [​IMG]

    in your opinion , this is which protocol ??
    in The manufacturer's catalog Been picture following :
    [​IMG]

    Also come in the catalog the following descriptions :
    [​IMG]


    i Already use rs485 to rs232 and ttl to rs232 converter but can not connect to device of my laptop !
    in your opinion ,Except ground pin , How do I know What are other pins ؟؟
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    mohammad2050 likes this.
  3. mohammad2050

    Thread Starter Member

    Nov 14, 2014
    56
    1
    Do you think that this is RS232 protocol ??
    Except should not be voltages between -3 to -15 and 3 to 15 volt in this protocol ? while Here are the voltages between 0 to 5 volt .
     
  4. mohammad2050

    Thread Starter Member

    Nov 14, 2014
    56
    1
    i use ttl to rs232 converter with max232
    As botton pin is for vcc and The following result appeared on hyper terminals .
    Each character that you see below is obtained by pressing tab button.
    [​IMG]

    this device works like this that with Press tab button , Settings page device appears.
    in your opinion , Why obtained this results ???
     
  5. ScottWang

    Moderator

    Aug 23, 2012
    4,855
    767
    Using RS232 still need to following the rule as 9600,n,8,2, if the frequency or setting is n't the same then it won't work probably, you have to try it until they are the same.
     
  6. mohammad2050

    Thread Starter Member

    Nov 14, 2014
    56
    1
    my device setting is 4800,n,8,1 . , i use this setting for connect to device in hiper terminal
    in your opinion , device setting change when use converter ??
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,566
    2,379
    What you want to do is use one of the RS232 trouble shooting programs such as RS232HEX COM http://download.cnet.com/RS232-Hex-Com-Tool/3000-2383_4-10064973.html
    You can set it for hex instead of ASCII and see the whole 8 bits.
    The convertor seems to change from RS232 to 5v with an optical translator, you need to go direct to the RS232 if you can and then into the Lap Top 9 pin port.
    Max.
     
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