Waveshare Modbus RS485 Relay Board via Node-Red and ZLAN Ethernet Modbus Gateway - full Guide

Since i found a viable solution to substitute the Tuya-Energy-Meters with ORNO-Modbus-Meters i still wanted to have a way of switching the electrical circuits i am measuring ON/OFF.

Must Haves:

  • switch things on and off
    ** maybe will become a Emergency Power Transfer Box with prority-based switchable circuits
  • all typical Voltages should be swhitchable
    ** 5V= Power Supply / USB-Power
    ** 12V= Power Supply, DIN-Rail-Relay
    ** 24V= Solar Battery Power, DIN-Rail-Relay
    ** 48V= Solar Battery Power
    ** 230V~
    ** 400V~
  • not use a Wireless connection

Since i already had a ZLAN 5143D Ethernet to Modbus RS485 Gateway lying around
image
i settled for the Waveshare RTU Relay Board
image

And then the Node-Red-Waltz went 1-2-3, 1-2-3 and with a little reading around the internet and documentation …

… i came up with this:

The upper half shows fetching the Relay-State:

1.)
We read the values every 10 seconds
image

2.)
We use a function mode to prep the read-command for the MODBUS Flex Getter
image

msg.payload = {
    'fc': 1,
    'unitid': 1,
    'address': 0x00ff,
    'quantity': 1,
};
return msg;

Then feed it to the Flex-Getter that accesses the Server-Settings
image

We get a message-Object that reads:
image

…and contains an array with the relay-states:
image

3.)
We use a function node to split that array into 8 descreet messages
image

var msg1= { payload: msg.payload[0] };
var msg2= { payload: msg.payload[1] };
var msg3= { payload: msg.payload[2] };
var msg4= { payload: msg.payload[3] };
var msg5= { payload: msg.payload[4] };
var msg6= { payload: msg.payload[5] };
var msg7= { payload: msg.payload[6] };
var msg8= { payload: msg.payload[7] };
return [msg1, msg2, msg3, msg4, msg5, msg6, msg7, msg8];

Each “exit” then transports a specific relay state over to home assistant.

4.)
A Home-Assistant Entity is created and fed the relay-state:
image

image

Voilà - we did not need to yammer into the config-file

The lower half shows, how to trigger a specific relay
1.)
A Home Assistant Switch entity is created:
image

image

The JSON-Payload shows the two states that are represented by the two outputs.

2.)
We use a fuction-node to create the payload for switching a single relay according to the switch state the message-payload announces
image

var val;
if (msg.payload=='on') {
    val= true;
}
if (msg.payload=='off') {
    val= false;
}
msg.payload = {
    'value': val,
    'fc': 5,
    'unitid': 1,
    'address': 0x0000,
    'quantity': 1,
};
return msg;

3.)
The MODBUS Flex writer is used to trigger the Relay-Board
image

Now we can create a Lovelace Dashboard:

And now we are ready to flip some switches…
e.g. when the battery state is below 15% we switch off the feed to the Inverter

for your delight - The Node-Red-JSON
Have fun, Playing around!

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    {
        "id": "4e0097f58dfc9d4b",
        "type": "ha-entity",
        "z": "659bdcb5f51541a2",
        "name": "Switch 4",
        "server": "69eb452d.8a610c",
        "version": 1,
        "debugenabled": false,
        "outputs": 2,
        "entityType": "switch",
        "config": [
            {
                "property": "name",
                "value": "Waveshare Relay 4 Switch"
            },
            {
                "property": "device_class",
                "value": ""
            },
            {
                "property": "icon",
                "value": ""
            },
            {
                "property": "unit_of_measurement",
                "value": ""
            }
        ],
        "state": "payload",
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        "attributes": [],
        "resend": true,
        "outputLocation": "",
        "outputLocationType": "none",
        "inputOverride": "allow",
        "outputOnStateChange": true,
        "outputPayload": "$entity().state ? \"on\": \"off\"",
        "outputPayloadType": "jsonata",
        "x": 80,
        "y": 700,
        "wires": [
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                "99e7c2da0e79d023"
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    {
        "id": "419daf65d8f65636",
        "type": "function",
        "z": "659bdcb5f51541a2",
        "name": "write 0x0004",
        "func": "var val;\nif (msg.payload=='on') {\n    val= true;\n}\nif (msg.payload=='off') {\n    val= false;\n}\nmsg.payload = {\n    'value': val,\n    'fc': 5,\n    'unitid': 1,\n    'address': 0x0004,\n    'quantity': 1,\n};\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 330,
        "y": 680,
        "wires": [
            [
                "da2cb8f1688f1716",
                "6a2e6922872c6bce"
            ]
        ]
    },
    {
        "id": "6516cc742509e357",
        "type": "ha-entity",
        "z": "659bdcb5f51541a2",
        "name": "Switch 5",
        "server": "69eb452d.8a610c",
        "version": 1,
        "debugenabled": false,
        "outputs": 2,
        "entityType": "switch",
        "config": [
            {
                "property": "name",
                "value": "Waveshare Relay 5 Switch"
            },
            {
                "property": "device_class",
                "value": ""
            },
            {
                "property": "icon",
                "value": ""
            },
            {
                "property": "unit_of_measurement",
                "value": ""
            }
        ],
        "state": "payload",
        "stateType": "msg",
        "attributes": [],
        "resend": true,
        "outputLocation": "",
        "outputLocationType": "none",
        "inputOverride": "allow",
        "outputOnStateChange": true,
        "outputPayload": "$entity().state ? \"on\": \"off\"",
        "outputPayloadType": "jsonata",
        "x": 80,
        "y": 760,
        "wires": [
            [
                "419daf65d8f65636"
            ],
            [
                "419daf65d8f65636"
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        ]
    },
    {
        "id": "2fd863635b747c90",
        "type": "function",
        "z": "659bdcb5f51541a2",
        "name": "write 0x0005",
        "func": "var val;\nif (msg.payload=='on') {\n    val= true;\n}\nif (msg.payload=='off') {\n    val= false;\n}\nmsg.payload = {\n    'value': val,\n    'fc': 5,\n    'unitid': 1,\n    'address': 0x0005,\n    'quantity': 1,\n};\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 730,
        "y": 660,
        "wires": [
            [
                "da2cb8f1688f1716",
                "6a2e6922872c6bce"
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    },
    {
        "id": "4e0e595466442e5e",
        "type": "ha-entity",
        "z": "659bdcb5f51541a2",
        "name": "Switch 6",
        "server": "69eb452d.8a610c",
        "version": 1,
        "debugenabled": false,
        "outputs": 2,
        "entityType": "switch",
        "config": [
            {
                "property": "name",
                "value": "Waveshare Relay 6 Switch"
            },
            {
                "property": "device_class",
                "value": ""
            },
            {
                "property": "icon",
                "value": ""
            },
            {
                "property": "unit_of_measurement",
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            }
        ],
        "state": "payload",
        "stateType": "msg",
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        "resend": true,
        "outputLocation": "",
        "outputLocationType": "none",
        "inputOverride": "allow",
        "outputOnStateChange": true,
        "outputPayload": "$entity().state ? \"on\": \"off\"",
        "outputPayloadType": "jsonata",
        "x": 560,
        "y": 680,
        "wires": [
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        "type": "function",
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        "name": "write 0x0006",
        "func": "var val;\nif (msg.payload=='on') {\n    val= true;\n}\nif (msg.payload=='off') {\n    val= false;\n}\nmsg.payload = {\n    'value': val,\n    'fc': 5,\n    'unitid': 1,\n    'address': 0x0006,\n    'quantity': 1,\n};\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 770,
        "y": 700,
        "wires": [
            [
                "da2cb8f1688f1716",
                "6a2e6922872c6bce"
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    },
    {
        "id": "237f2ebe1642f5cb",
        "type": "ha-entity",
        "z": "659bdcb5f51541a2",
        "name": "Switch 7",
        "server": "69eb452d.8a610c",
        "version": 1,
        "debugenabled": false,
        "outputs": 2,
        "entityType": "switch",
        "config": [
            {
                "property": "name",
                "value": "Waveshare Relay 7 Switch"
            },
            {
                "property": "device_class",
                "value": ""
            },
            {
                "property": "icon",
                "value": ""
            },
            {
                "property": "unit_of_measurement",
                "value": ""
            }
        ],
        "state": "payload",
        "stateType": "msg",
        "attributes": [],
        "resend": true,
        "outputLocation": "",
        "outputLocationType": "none",
        "inputOverride": "allow",
        "outputOnStateChange": true,
        "outputPayload": "$entity().state ? \"on\": \"off\"",
        "outputPayloadType": "jsonata",
        "x": 560,
        "y": 740,
        "wires": [
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            [
                "61cc935cf845bd04"
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    {
        "id": "d849a2effaf96b3d",
        "type": "function",
        "z": "659bdcb5f51541a2",
        "name": "write 0x0007",
        "func": "var val;\nif (msg.payload=='on') {\n    val= true;\n}\nif (msg.payload=='off') {\n    val= false;\n}\nmsg.payload = {\n    'value': val,\n    'fc': 5,\n    'unitid': 1,\n    'address': 0x0007,\n    'quantity': 1,\n};\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 790,
        "y": 740,
        "wires": [
            [
                "da2cb8f1688f1716",
                "6a2e6922872c6bce"
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    },
    {
        "id": "5a325959beb30c03",
        "type": "ha-entity",
        "z": "659bdcb5f51541a2",
        "name": "Switch 8",
        "server": "69eb452d.8a610c",
        "version": 1,
        "debugenabled": false,
        "outputs": 2,
        "entityType": "switch",
        "config": [
            {
                "property": "name",
                "value": "Waveshare Relay 8 Switch"
            },
            {
                "property": "device_class",
                "value": ""
            },
            {
                "property": "icon",
                "value": ""
            },
            {
                "property": "unit_of_measurement",
                "value": ""
            }
        ],
        "state": "payload",
        "stateType": "msg",
        "attributes": [],
        "resend": true,
        "outputLocation": "",
        "outputLocationType": "none",
        "inputOverride": "allow",
        "outputOnStateChange": true,
        "outputPayload": "$entity().state ? \"on\": \"off\"",
        "outputPayloadType": "jsonata",
        "x": 560,
        "y": 800,
        "wires": [
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                "d849a2effaf96b3d"
            ],
            [
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            ]
        ]
    },
    {
        "id": "bd4c735308ae1a40",
        "type": "modbus-client",
        "name": "Waveshare",
        "clienttype": "tcp",
        "bufferCommands": true,
        "stateLogEnabled": false,
        "queueLogEnabled": false,
        "tcpHost": "10.0.0.69",
        "tcpPort": "502",
        "tcpType": "DEFAULT",
        "serialPort": "/dev/ttyUSB",
        "serialType": "RTU-BUFFERD",
        "serialBaudrate": "9600",
        "serialDatabits": "8",
        "serialStopbits": "1",
        "serialParity": "none",
        "serialConnectionDelay": "100",
        "unit_id": "1",
        "commandDelay": "1",
        "clientTimeout": "1000",
        "reconnectOnTimeout": true,
        "reconnectTimeout": "2000",
        "parallelUnitIdsAllowed": true
    },
    {
        "id": "69eb452d.8a610c",
        "type": "server",
        "name": "Home Assistant",
        "version": 1,
        "addon": true,
        "rejectUnauthorizedCerts": true,
        "ha_boolean": "y|yes|true|on|home|open",
        "connectionDelay": true,
        "cacheJson": true
    }
]
1 Like

Hi Thomas,

Interesting to read about your experience with this RS485 workflow.
I will definitely look further into it as I’m looking into working with RS485 at the moment.
I would like to implement a lot of sensors relatively close to each other (in an area of 12x8m approx)
For this I wanted to have a lot (about 100) of sensors with a good reliability and no hassle with changing out batteries. Among these sensors there will be motion, door/reed, waterleak, pressure, temperature & humidity, pushbuttons, rotarydails, …
Have a look at the thread I created for it with a bit more information how I would like to set evrything up here: A lot of sensors

For some of them it’s no problem to refresh them on an interval like 5/10/30s. But for the door/reed, and motion sensors for example it would be crucial in HA to get the update as soon as the change happens.
Is that possible with RS485?

For now I’ve always come across an update interval.
How would I manage something like that?
Any help is appreciated, thanks!

Pieter