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EmonTX to Rpi - Direct Serial Connection

So have the signal and gnd connected as per the photos have tried

com_port= /dev/ttyUSB0

in the file emonhub.conf

and com_port = /dev/ttyRS485-0

neither seem to work nothing is appearing in the inputs screen any way of fault finding.

The TX unit has no lights on it well just one red light on start up for a 5 seconds.

Linked post for reference Pre Order Question

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Did you go back to the original link, where there’s a link to the software changes required:

https://wiki.openenergymonitor.org/index.php/EmonTx_V3.4#Direct_connection_emonTx_V3_.3E_Raspberry_Pi_GPIO

That page predates the latest versions of both emonTx software and the RPi’s - one immediate thing to check is baud rates. The emonTx is almost certainly using 115200, not 9600.

Is this an EmonSD image you are running?

yes it is a EmonSD

I have edited the file as per the link https://github.com/openenergymonitor/emonhub/tree/emon-pi/conf/interfacer_examples/directserial-serialtx3e

Add the following to emonhub.conf in the [interfacers] section:

[interfacers]
### This interfacer manages the EmonTx3 ESP format serial
[[SerialTx3e]]
     Type = EmonHubTx3eInterfacer
      [[[init_settings]]]
           # Un-comment line below if using RS485 adapter
           #com_port = /dev/ttyRS485-0
           # default com port if using USB to UART adapter
           com_port= /dev/ttyUSB0
           com_baud = 115200
      [[[runtimesettings]]]
           pubchannels = ToEmonCMS,

So I had been entering the commands via ssh and not using the Emonhub.After entering the parameters above I am now seeing

or

depending which line I uncomment

I think it might be /dev/serial0

Note the comment refers to a USB port adapter for that not the RPi GPIO pins.

spot on with /dev/serial0 I now have some data coming through


although not consistent and lots of errors

amended the conf file further to rem out the [[RFM2Pi]] section and it seems to have solved it.

my interfaces section now looks like this

[interfacers]

### This interfacer manages the EmonTx3 ESP format serial
[[SerialTx3e]]
     Type = EmonHubTx3eInterfacer
      [[[init_settings]]]
           # Un-comment line below if using RS485 adapter
           com_port = /dev/serial0
         #com_port = /dev/ttyRS485-0
         # default com port if using USB to UART adapter
         #com_port= /dev/ttyUSB0
           com_baud = 115200
      [[[runtimesettings]]]
           pubchannels = ToEmonCMS,


### This interfacer manages the RFM12Pi/RFM69Pi/emonPi module
#[[RFM2Pi]]
#    Type = EmonHubJeeInterfacer
#    [[[init_settings]]]
#        com_port = /dev/ttyAMA0
#        com_baud = 38400                        # 9600 for old RFM12Pi
#    [[[runtimesettings]]]
#        pubchannels = ToEmonCMS,
#        subchannels = ToRFM12,
        

       group = 210
        frequency = 433
        baseid = 5                              # emonPi / emonBase nodeID
        calibration = 230V                      # (UK/EU: 230V, US: 110V)
        quiet = true                            # Disable quite mode (default enabled) to enable RF packet debugging, show packets which fail crc
        # interval =  300                         # Interval to transmit time to emonGLCD (seconds)
        

[[MQTT]]

    Type = EmonHubMqttInterfacer
    [[[init_settings]]]
        mqtt_host = 127.0.0.1
        mqtt_port = 1883
        mqtt_user = emonpi
        mqtt_passwd = emonpimqtt2016

    [[[runtimesettings]]]
        pubchannels = ToRFM12,
        subchannels = ToEmonCMS,

        # emonhub/rx/10/values format
        # Use with emoncms Nodes module
        node_format_enable = 1
        node_format_basetopic = emonhub/

        # emon/emontx/power1 format - use with Emoncms MQTT input
        # http://github.com/emoncms/emoncms/blob/master/docs/RaspberryPi/MQTT.md
        nodevar_format_enable = 1
        nodevar_format_basetopic = emon/

[[emoncmsorg]]
    Type = EmonHubEmoncmsHTTPInterfacer
    [[[init_settings]]]
    [[[runtimesettings]]]
        pubchannels = ToRFM12,
        subchannels = ToEmonCMS,
        url = https://emoncms.org
        apikey = xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
        senddata = 1                    # Enable sending data to Emoncms.org
        sendstatus = 1                  # Enable sending WAN IP to Emoncms.org MyIP > https://emoncms.org/myip/list
        sendinterval= 30                # Bulk send interval to Emoncms.org in seconds

Yes /dev/ttyAMA0 and /dev/serial0 are probably the same physical port.

Thanks again for your help I have something working, just need to extend two of the CT clamps and then will be in business.

That makes sense. With it enabled, you had a com port conflict. i.e. two devices were configured to use the same serial port at the same time.

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