Serial to Ethernet converter

Discussion in 'Embedded Systems and Microcontrollers' started by IG121, Dec 30, 2014.

  1. IG121

    Thread Starter New Member

    Dec 30, 2014
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    0
    Hello

    I am kinda new with this. So the problem that I have start to build a Access Control System. I am using a card reader RAC-520 and a converter e-net TCP/IP, model e-P132-x. index.jpg index2.jpg

    And I have 2 problems

    1. The E-Net converter dose not talk to my pc. I have a software provided with the converter called ETM.
    2. I am connecting the card readers on RS-485 and the Tx and the Rx diods on the converter doesn't light up.

    Here is a link to the manual of the converter: http://www.decision-computer.de/Download/Manuals/Seriell/Konverter/E-P132-X-User-Manual.pdf



    Thank you for the help. I try to google and made a big research but no resutls.
     
  2. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
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    RS485 is notoriously hard to set up. I Think they should have said 485 half-duplex on the keyboard.
    You do need two wires and ground and you do need terminators at each end of the transmission line. Ground may create a loop, so be careful.

    Signals are sent differentially like Rs422.

    You will have to have the baud, parity and number of databits right. There is an address too.

    There is some good info at www.blackbox.com. A few measurements with a DVM and you should be set. I'm very rusty.
     
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  3. IG121

    Thread Starter New Member

    Dec 30, 2014
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    My first problem is to connect it to the computer :( afdter that i will think about RS-485
     
  4. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
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    Put things in RS232 and loop back first. That's easier.

    Then use a serial program to get communication back to yourself.
     
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  5. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,377
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    To connect directly two devices using ethernet, you need a special ethernet cable called Crossover Cable.

    If you have an ethernet hub, then you don't need crossover cable. Just plug both devices into the hub. The hub provides the necessary crossover.
     
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  6. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
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    shteii01:

    Not necessarily true. If one port is an Auto-MDiX then your OK. If one port is gigabit, it's always auto-MDIX.
    I only had one early device that would not work/configure with a crossover cable. I had to use a hub/switch.

    Hubs with a dedicated uplink port are not auto-MDIX.
     
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  7. IG121

    Thread Starter New Member

    Dec 30, 2014
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    I have try with crossover and I have try with hub but no result. This thing drive me crazy .....
     
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