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No. 1701 Re: Re: Re: SMG-5420 - No Signals via Modbus RTU 2019-11-14


Great to hear that!

Best regards,

> Benjamin Beck wrote:
> ------------------------------------
> Works! Thank you for your fast response.
>
> Benjamin Beck
>
>
> > Sollae Systems wrote:
> > ------------------------------------
> > Dear Benjamin Beck,
> >
> > SMG-5420 device receives Modbus/TCP frame from TCP, converts it to Modbus RTU/ASCII frame and sends it to the serial port, and vice versa.
> >
> > Seemingly, the date frame you sent via TCP is the Modbus RTU frame, NOT Modbus/TCP frame. Therefore, It does NOT work.
> >
> > You can refer to Mobus/TCP frame in this document https://www.eztcp.com/en/download/pds_files/an_modbus_tcp_en.pdf
> >
> > We recommend you to use a Modbus Tool for testing instead of sending raw data for testing.
> >
> > For more information about configuring SMG-5420, you can refer to this FAQ: https://www.eztcp.com/en/support/view.php?page=1&cid=484
> >
> > If the problem is not solved, could you please send us via email (support@eztcp.com) the following information:
> > - The screenshot of SMG-5420's setting
> > - Modbus configuration of your control unit
> >
> > And, is your network topology similar to the scheme in this image https://www.eztcp.com/en/support/images/case1.png ?
> >
> >
> >
> >
> > > Benjamin Beck wrote:
> > > ------------------------------------
> > > Dear Madams and Sirs,
> > >
> > > I am trying to connect a SMG-5420 device to control unit via ModbusRTU (RS485). Seemingly, the SMG does not recognize any Signals on TX and RX. I am using the following configuration
> > >
> > > Bd-rate: 9600 bps
> > > Data bits: 8
> > > Stop bits: 2
> > > Parity: None
> > > SMG working as TCP Server
> > > Port 502
> > > Connection Timeout 60s
> > > Query Flow: TCP to Serial
> > > Slave ID 0
> > > Response Time: 500 ms
> > > Send Gateway Exception: Disable
> > >
> > > When I try to access the Modbus via EzTerm (or similar tools) and try to send
> > >
> > > 15 04 00 02 00 01 93 1E
> > >
> > > The connection is terminated.
> > >
> > > Trying to emulate a Com-Port via ezVSP didn't either.
> > >
> > > Is a 120 Ohm resistor necessary for proper signal termination? What might be the reason for the Modbus Connection problems?
> > >
> > > Best regards,
> > >
> > > Benjamin Beck
> > >
> > >
> > >

Writer Sollae Systems Company sollae