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I want to use an Elfin EW11 device as a Modbus TCP Client/Master to send requests to a Modbus TCP Server/Slave (another Elfin EW11). It is connected via RS485 to my Test-Computer/PC.

PC ---RS485--> Elfin EW11 TCP Client ---WLAN---> Elfin EW11 TCP Server---RS485--->IOT Device

The Elfin EW11 Modbus TCP Client should reveive requests from ts RS485 Interface and send them via WLAN to the Modbus TCP Server.

It appears in its status-page, that

  1. it is connected to the server 2, receives requests from RS485, but
  2. does not send anything to the server

See screenshot of the status page of the Modbus TCP Client Screenshot1

I already tried a. the Modbus TCP server. It responds well when queried directly from my PC via WLAN b. several options,timeouts etc. in the configuration of the TCP Client. Without success. No data were transmitted from the TCP Client to the TCP Server

I would have expected at least that some bytes were transferred, even if the Modbus request would be wrong.

INSERT: I am quite sure that the frames/modbus requests sent from my PC are in the correct format (See my comments below)

Anyone got an Elfin EW11 working as a Modbus TCP Client?

My Client Config (backup XML):

            <!--SYS Config-->
            <SYS key='User' value='admin'>
            <SYS key='Password' value='admin'>
            <SYS key='DHCP' value='Enable'>
            <SYS key='Ip Address' value='10.10.100.10'>
            <SYS key='GateWay' value='10.10.100.254'>
            <SYS key='Mask' value='255.255.255.0'>
            <SYS key='Host Name' value='EW11-DTU'>
            <SYS key='DNS' value='223.5.5.5'>
            <SYS key='Telnet' value='Disable'>
            <SYS key='Telnet Port' value='23'>
            <SYS key='Echo' value='Enable'>
            <SYS key='Web' value='Enable'>
            <SYS key='Web Port' value='80'>
            <SYS key='Ipv6' value='Disable'>
            <SYS key='Ipv6 address' value=''>
            <SYS key='Ipv6 DHCP' value='Disable'>
            <SYS key='NTP' value='Disable'>
            <SYS key='NTP Server' value=''>
            <SYS key='NTP Port' value='0'>
            <SYS key='NTP GMT' value='8'>
            <SYS key='Customer ID' value='EW11'>
            <SYS key='Config Version' value='0'>
            <SYS key='NetworkMode' value='Router'>
            <SYS key='WiFiMode' value='APSTA'>
            <SYS key='WiFiAPSSID' value='EW11_F330'>
            <SYS key='WiFiAPKey' value=''>
            <SYS key='WiFiSTASSID' value='myWLAN'>
            <SYS key='WiFiSTAKey' value='xxxxxxxxxx'>
            <SYS key='WiFiAPCH' value='0'>
            <SYS key='WiFiHideSSID' value='0'>
            <SYS key='WiFiRoamingEn' value='0'>
            <SYS key='ScanRSSIThreshold' value='0'>
            <SYS key='ConnectRSSIThreshold' value='0'>
            <SYS key='LanIpAddress' value='10.10.100.254'>
            <SYS key='LanMarsk' value='255.255.255.0'>
            <SYS key='LanDhcpEn' value='Enable'>
            <SYS key='EthernetMode' value='WAN'>
            <SYS key='Longitude' value='0.000000'>
            <SYS key='Latitude' value='0.000000'>
            <SYS key='SmartConfig' value='SmartLink'>
            <SYS key='ModbusTime' value='0'>

            <!--UART Config-->
            <UART key='Baudrate' value='9600'>
            <UART key='Databits' value='8'>
            <UART key='Stopbits' value='1'>
            <UART key='Parity' value='NONE'>
            <UART key='FlowCtrl' value='Half-Duplex'>
            <UART key='Software FlowCtrl' value='Disable'>
            <UART key='Xon' value='11'>
            <UART key='Xoff' value='13'>
            <UART key='Protocol' value='Modbus'>
            <UART key='Frame Length' value='16'>
            <UART key='Frame Time' value='100'>
            <UART key='Tag Enable' value='Disable'>
            <UART key='Tag Head' value='00'>
            <UART key='Tag Tail' value='00'>
            <UART key='Buffer Size' value='512'>
            <UART key='gapTime Size' value='50'>
            <UART key='cliGetin' value='1'>
            <UART key='serialStr' value='+++'>
            <UART key='waitTime' value='300'>

            <!--SOCK Config-->
            <SOCK name='netp' key='Name' value='netp'>
            <SOCK name='netp' key='Protocol' value='TCP-CLIENT'>
            <SOCK name='netp' key='Server Addr' value='10.0.0.2'>
            <SOCK name='netp' key='Remote Port' value='502'>
            <SOCK name='netp' key='Local Port' value='0'>
            <SOCK name='netp' key='Buffer Size' value='8192'>
            <SOCK name='netp' key='KeepAlive' value='32'>
            <SOCK name='netp' key='Timeout' value='60'>
            <SOCK name='netp' key='Security' value='NONE'>
            <SOCK name='netp' key='HeartBeat' value='Disable'>
            <SOCK name='netp' key='Regist Mode' value='Disable'>
            <SOCK name='netp' key='Regist Code' value=''>
            <SOCK name='netp' key='Connect Mode' value='Always'>
            <SOCK name='netp' key='VcomEn' value='0'>
            <SOCK name='netp' key='Rout' value='uart'>

            <!--CRC Config-->
            <CRC key='CheckNum' value='231438'>

Server Config:

            <!--SYS Config-->
            <SYS key='User' value='admin'>
            <SYS key='Password' value='admin'>
            <SYS key='DHCP' value='Enable'>
            <SYS key='Ip Address' value='10.10.100.10'>
            <SYS key='GateWay' value='10.10.100.254'>
            <SYS key='Mask' value='255.255.255.0'>
            <SYS key='Host Name' value='EW11-DTSU666-H'>
            <SYS key='DNS' value='223.5.5.5'>
            <SYS key='Telnet' value='Disable'>
            <SYS key='Telnet Port' value='23'>
            <SYS key='Echo' value='Enable'>
            <SYS key='Web' value='Enable'>
            <SYS key='Web Port' value='80'>
            <SYS key='Ipv6' value='Disable'>
            <SYS key='Ipv6 address' value=''>
            <SYS key='Ipv6 DHCP' value='Disable'>
            <SYS key='NTP' value='Disable'>
            <SYS key='NTP Server' value=''>
            <SYS key='NTP Port' value='0'>
            <SYS key='NTP GMT' value='8'>
            <SYS key='Customer ID' value='EW11'>
            <SYS key='Config Version' value='0'>
            <SYS key='NetworkMode' value='Router'>
            <SYS key='WiFiMode' value='STA'>
            <SYS key='WiFiAPSSID' value='EW11_F0FC'>
            <SYS key='WiFiAPKey' value=''>
            <SYS key='WiFiSTASSID' value='myWLAN'>
            <SYS key='WiFiSTAKey' value='xxxxxxxx'>
            <SYS key='WiFiAPCH' value='0'>
            <SYS key='WiFiHideSSID' value='0'>
            <SYS key='WiFiRoamingEn' value='0'>
            <SYS key='ScanRSSIThreshold' value='0'>
            <SYS key='ConnectRSSIThreshold' value='0'>
            <SYS key='LanIpAddress' value='10.0.0.2'>
            <SYS key='LanMarsk' value='255.255.255.0'>
            <SYS key='LanDhcpEn' value='Enable'>
            <SYS key='EthernetMode' value='WAN'>
            <SYS key='Longitude' value='0.000000'>
            <SYS key='Latitude' value='0.000000'>
            <SYS key='SmartConfig' value='SmartLink'>
            <SYS key='ModbusTime' value='0'>

            <!--UART Config-->
            <UART key='Baudrate' value='9600'>
            <UART key='Databits' value='8'>
            <UART key='Stopbits' value='1'>
            <UART key='Parity' value='NONE'>
            <UART key='FlowCtrl' value='Half-Duplex'>
            <UART key='Software FlowCtrl' value='Disable'>
            <UART key='Xon' value='11'>
            <UART key='Xoff' value='13'>
            <UART key='Protocol' value='Modbus'>
            <UART key='Frame Length' value='16'>
            <UART key='Frame Time' value='100'>
            <UART key='Tag Enable' value='Disable'>
            <UART key='Tag Head' value='00'>
            <UART key='Tag Tail' value='00'>
            <UART key='Buffer Size' value='512'>
            <UART key='gapTime Size' value='50'>
            <UART key='cliGetin' value='1'>
            <UART key='serialStr' value='+++'>
            <UART key='waitTime' value='300'>

            <!--SOCK Config-->
            <SOCK name='netp' key='Name' value='netp'>
            <SOCK name='netp' key='Protocol' value='TCP-SERVER'>
            <SOCK name='netp' key='Server Addr' value='0.0.0.0'>
            <SOCK name='netp' key='Remote Port' value='0'>
            <SOCK name='netp' key='Local Port' value='502'>
            <SOCK name='netp' key='Buffer Size' value='8192'>
            <SOCK name='netp' key='KeepAlive' value='32'>
            <SOCK name='netp' key='Timeout' value='600'>
            <SOCK name='netp' key='Security' value='NONE'>
            <SOCK name='netp' key='Connect Mode' value='Always'>
            <SOCK name='netp' key='VcomEn' value='0'>
            <SOCK name='netp' key='Rout' value='uart'>
            <SOCK name='netp' key='maxAccept' value='3'>

            <!--CRC Config-->
            <CRC key='CheckNum' value='222713'>
Jerry
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  • Hello Jerry, how are you sending frames from the test PC to the Elfin client? What RS485 are you using? The fact that you see bytes received on Elfin's client serial ports does not mean much, you need to be sending proper Modbus frames. Maybe you can show in detail how did you proceed to set up the server and client, are you following the D2D application manual? – Marcos G. Feb 03 '23 at 13:31
  • Hello Marcos, at my Test-PC I use the free Modbus Master Tool. This has an RTU and a TCP Mode. 1. In TCP Mode it can communicate directly with the Modbus TCP Server at 10.0.0.2. This works fine. 2. In RTU mode it communicates via COM5 and a USB-to-RS485-Dongle. I tested this hard-wired directly to my IOT Device. And this also works fine. Therefore (and because of 3. ) I am quite sure that the frames are OK 3. In my Test configuration PC ---RS485--> Elfin EW11 TCP Client ---WLAN---> Elfin EW11 TCP Server---RS485--->IOT Device it does not work. – Jerry Feb 03 '23 at 18:03
  • In my "production" configuration it should work like that: Hoymiles DTU ---> RS485 ---> Elfin EW11 (TCP Client) ---> Wlan ---> Elfin EW11 (TCP Server) --> IOT Device Of course I tried this too. But with the same result as in my test configuration. – Jerry Feb 03 '23 at 18:06
  • Marcos what is the "D2D application manual" ? – Jerry Feb 03 '23 at 18:30
  • OK, I see. I think there must be something wrong with your configuration somewhere. The D2D manual (I imagine it means device-to-device) is part of the [industry products application manual](http://www.hi-flying.com/download-center-1/application-notes-1/download-item-industry-products-application-manual). I don't know if there is something useful in there, at first sight, it seems to me to be quite hard to follow... I would start with an easier configuration, just using one of the EW11, to make it work as a forwarder, to be able to isolate the source of the problem. – Marcos G. Feb 04 '23 at 07:57
  • Yes, I assume a mis-config or a firmware bug. – Jerry Feb 05 '23 at 08:45

0 Answers0