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    TCP Modbus Master

    All,

    I'm new to Modbus and am struggling a bit with the finding a RS485 to IP-RTU device to use as a gateway. I think I need one with two channels for the reasons discussed in the next paragraph. Can anyone help? Will one of the devices that follow work or can you recommend others (In order of ascending cost):
    - EKM iSerial v.2 TCP/IP Ethernet to RS-485 Serial Converter. (1 Channel) https://www.ekmmetering.com/ekm-iser...verter.html#qa
    - gridconnect NET485. (1 Channel, I think, although the docs discuss RS485 Multi-Drop network support which might support more than one channel?) https://gridconnect.com/industrial-e...-ethernet.html
    - Advantech Adam-6060-CE. (6 Channels) http://www.newark.com/advantech/adam...ule/dp/18X2332
    - SolarEdge Control and Communications Gateway SE1000-CCG-G. https://www.civicsolar.com/product/s...way-se1000-ccg

    I want to use the ModBus plugin to pull data from two solar edge inverters (Thanks to John den Dunnen for the info he posted in another ModBus thread. Without his help, I'd be trying to use the SolarEdge API). The Solar Edge SunSpec Manual gave me the impression I could connect directly to the "master" inverter. Unfortunately, but I couldn't communicate directly with it (even tried modpoll to test). I'd also like to pull data from two EKM pulse water meters. I've been unsuccessfully getting the pulse data into HS. I've tried using an Elk Security Panel input and Arduino. If I get ModBus working, I'll have to add an EKM Omnimeter Pulse v.4 to read the pulses and convert them to ModBus protocol. https://www.ekmmetering.com/ekm-omni...ric-meter.html. The inverters and the water meters are in different locations, but I have Cat6 wire home runs to both.

    Thanks, Forrest

    #2
    Hello Forrest,
    About EKM and Modbus, EKM is not modbus compliant. I have one unit myself and discussed with John (EKM) about this.
    The converter is following the same idea
    EKM devices are using the rs485 communication but NOT the modbus protocol.
    So, I think you should use a script to talk to the EKM unit/converters directly, using RS485.
    I'm new here (HS) but I have knowledge about modbus (lot of modbus units): Tbox, Barionet, Cel-Mar 1wire, modbus relays, etc.
    And about energy modbus meters, I tested some eastron meters and waiting for a global one with CT's
    The advantage of Eastron is that they are real modbus units and you just need to harvest some registers to obtain instant Watts, amps and kWh
    <a href="https://www.aliexpress.com/item/SDM63M-CT-Mutli-Function-Four-Module-Three-Phase-Digital-Din-Rail-Power-Meter/721824531.html" target="_blank">Eastron</a>
    Will post, if interested, some info about HS, modbus and Eastron energy meters.
    Regards,
    Mike
    Hope it helps
    Last edited by ppz1961; January 1, 2018, 01:48 PM.

    Comment


      #3
      Originally posted by ppz1961 View Post
      Hello Forrest,
      About EKM and Modbus, EKM is not modbus compliant. I have one unit myself and discussed with John (EKM) about this.
      The converter is following the same idea
      EKM devices are using the rs485 communication but NOT the modbus protocol.
      So, I think you should use a script to talk to the EKM unit/converters directly, using RS485.
      I'm new here (HS) but I have knowledge about modbus (lot of modbus units): Tbox, Barionet, Cel-Mar 1wire, modbus relays, etc.
      And about energy modbus meters, I tested some eastron meters and waiting for a global one with CT's
      The advantage of Eastron is that they are real modbus units and you just need to harvest some registers to obtain instant Watts, amps and kWh
      <a href="https://www.aliexpress.com/item/SDM63M-CT-Mutli-Function-Four-Module-Three-Phase-Digital-Din-Rail-Power-Meter/721824531.html" target="_blank">Eastron</a>
      Will post, if interested, some info about HS, modbus and Eastron energy meters.
      Regards,
      Mike
      Hope it helps
      Mike,

      I appreciate the help. You've saved me from wasting some money, since I haven't purchased the EKM iSerial or EKM Energy meter. I don't need an energy meter. But I do need to pull data from my Solar Edge Inverters into HS. They use ModBus protocol per the SolarEdge Document at https://www.solaredge.com/sites/defa...nical-note.pdf. I think I need a RS485 to TCP/IP RTU Gateway Device to pull the data from the inverters into HS. Additionally, I'd like to find a modbus device that converts the inputs form two EKM pulse water meters to Modbus protocol. Any additional information you could provide on reasonably priced modbus devices that would work for these purposes would be great.

      Thanks

      Forrest

      Comment


        #4
        TCP Modbus Master vs EKM Metering

        Hi Forrest,

        I think you need to convert the strings from the devices (1200,7,E,1) to modbus signal. I don't think a hardware device can do that because the protocol used is not following modbus rules. So a kind of driver will do that task "easily".
        I suggest that you contact Jameson at EKM.

        That's the reason I'll change my main meter very soon. To stick on modbus protocol and be able to daisy chain all my devices together. I'm too lazy to program a driver. Select 4 or 5 registers on a modbus unit is faster than you imagine.

        Mike

        some link about this:

        http://www.eastrongroup.com/data/upl..._2016_V5_6.pdf

        modbus protocol for eastron meters
        http://www.flanesi.it/blog/download/...col%20V1.2.pdf

        http://forum.ekmmetering.com/viewtop...cc38fcb3#p6373

        and a sample of the protocol used:
        http://documents.ekmmetering.com/Omn...v4-Parsing.pdf
        Attached Files
        Last edited by ppz1961; January 2, 2018, 12:32 AM.

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