Total noob here with Teltonika and RS485. I tried following guides but they get complicated fast and YouTube was no help.
I have a thermostat / humidity sensor. Yes I found out later on that there might have been a Bluetooth solution with another modem but alas here we are.
Sensor has A / B / V+ / V- ports. It uses generic 9600 baud, 1 bit start, 8 data bits, 1 stop, no parity. Communication type is modbus-rtu.
Originally wired it as B on 1, A on 4, but not sure if I should jump 1 and 2 together and 4 and 5 together? There was also mention of resistors but I’d assume the thermometer would have that on the circuitry.
Also assuming this requires power the RUT956 can’t supply, do I need to wire V+ to in this case 12vdc and that same 12vdc into 6 and negative from the psu and V- to 3?
Unfortunately these are not the types of circuits I deal with.
Does this need to run as a server or as client under modbus RS485 service tab? Anything specific I need to program?
Final question, I ultimately wanted a display on the dashboard of the readout but looks like that’s not possible. How can I get the data in a format I can easily access as a log or other?
For more information on RS485, especially regarding its implementation on the RUT956, please visit the following wiki page: RS485 on RUT956.
Below is a simple diagram showing how pins should get shorted:
Please note that RS485 on the RUT956 is used only for communication and does not supply or require power.
Attached is a quick tutorial on how to configure and test Serial Modbus communication. In this example, I have read data from the RUT956:
Regarding creating a dashboard, our router does not have built-in functionality for this. You will need to use your own data visualization solution. However, we offer a “Data to Server” service that helps you send Modbus data to your desired server, where your data visualization solution is hosted. You might want to consider using Node-RED for Modbus data visualization.
Please note that Modbus is primarily an industrial communication protocol and is rarely used in home or similar monitoring situations. For these scenarios, MQTT is a better protocol as it is more widely adopted and used in this field.
Can MQTT be used with RS485 easily? I am not familiar. This is a remote enclosure that’s industrial monitoring the temperature of the systems inside. I just need an easily programmed and readily available data more than anything.
Yes, it can be done. The ease of use will depend on your experience with the technology, but it should not be too difficult. Here is some information on how to achieve it: Modbus TCP Master MQTT Gateway. You can also check our wiki for more details on any topic you are interested in.
