question

Tim Schlak avatar image
Tim Schlak asked

Connecting Multiplus-II with ET112

Hey,

I have a problem establishing a working connection between the Multiplus-II 48/3000/35-32 230V GX an the Carlo Gavazzi ET112.

Basics about our setup: Wie have a PV Inverter feeding into the grid, we want to store overproduced Energie into batteries. So we installed the ET112 directly behind the energy meter from our provider. Then connected the data lines following the instructions from the manual, (10-15m CAT-5 cable, FTDI-USB RS485 Bridge with cable shortend to less than 20cm, etc).

When plugging in the FTDI Bridge, there is a short blinking of RX and TX Leds, but nothing else. To verify that our connection is working, we downloaded the Carlo Gavazzi Software for the meter, which instantly connected to the meter. So i guess the RS485 Bus, FDTI and ET112 are working just fine.

But there is no energy meter shown in the remote console of the Multiplus-II.

We tried multiple Configurations of the meters RS485 interface without success.

To verify that the FTDI ist recognised by the Multiplus-II we logged into the system via SSH an lsusb revealed that the USB/RS485 bridge is at least hooked to the system. A hexdump of /dev/ttyUSB1 did not show anything. No LEDs blinking on the FTDI showing that the Device is trying to transmit data.

In the Carlo Gavazzi Software, the standard RS485 configuration is 9600, parity none, stop 1, modbus id 1. Due to the fact, that a baudrate of 1152000 did not lead to any problems during the use of the Carlo Gavazzi Software, there should not be any issues with the cabeling.

So i hope that someone here might have an idea of what is wrong.


Multiplus-IIESSEnergy Meter
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3 Answers
agriengineer avatar image
agriengineer answered ·

Hi Tim, did you get to the bottom of this?

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matt1309 avatar image
matt1309 answered ·

I had a similar issue when plugged mine in. Steps I took (not sure what fixed it).

1. Upgraded GX to latest firmware

2. Changed baud rate in Carlos software. I think I went to max baud rate then saved. Then back to 9800 but not 100% certain.

3. Reboot GX device and waited. Eventually the rs485 to USB started flashing white (the victron one, blue light first then white when data is flowing i think) and the et112 light on left hand side will flash orange/green.


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h-copter avatar image
h-copter answered ·

Hi, I am interested to know what works as I am planning on installng a MP-II 30m from grid connection point. Please can someone provide details on specific products I need to get current sense across that distance. Thanks

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pau1phi11ips avatar image pau1phi11ips commented ·

Either

  • Send the RS-485 down Cat-5 or Cat-6 cable
  • Or RS-485 to ZigBee wireless bridge - https://www.victronenergy.com/accessories/zigbee-converters

    The ZigBee adapters can be purchased a lot cheaper directly from China if you can wait for them DRF2659C and DRF2658C are the part codes.
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