Does product include modbus register map?

Yes..., it includes pre-defined memory map locations where you can read the Temperature and Humidity value, and also includes memory locations where you can write an Off-Set value to the Temperature and Humidity sensor to calibrate them.

Where do I download the manual ?

Seaech on interbet model and you find manual and instructions.

Does it requires programming? does it comes with a manual if so? is the data transmitted without rs485 request? at what periodic rate if so?

It may or may not require programming..., provided if you want to calibrate the sensors. But you will definitely have to communicate with the sensor. And either Modbus RTU or UART RS-485 are the only two methods. You will have to web search how these protocol work. The Baud Rate is 9600. Yes it comes with a manual and you can also download it from the web. Modbus RTU is a software communication protocol which incorporates RS-485, the serial hardware communication protocol. So you can find a lot Modbus RTU protocol out there on the web..., some free and some paid for. I bought the paid-for ones because i wanted all the flexibility in the software.

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Description

❤Note: Users need to prepare their own ModBus debugging tool and RS485 debugger. Users needs to complete write code according to the communication protocol and commands if using the controller to receive data.
❤Using Steps: 1>.Connect signal receiver such as Arduino to RS485 terminal. 2>.Input power supply at power terminal. 3>.According to the acquired data, the data is processed differently according to actual needs.
❤Product adopts industrial-grade chip, high-precision SHT20 temperature and humidity sensors, ensure the products with good reliability, high precision and interchangeability.
❤Adopt RS485 hardware interface (with the lightning protection design), the protocol layer compatible with standard industrial Modbus RTU protocol.
❤This product integrating MODBUS protocol and ordinary UART communication protocol, users can choose communication protocols, UART communication support automatic report function (Connect the RS485 serial interface mode tool by automatically output temperature and humidity).

DONGKER Temperature Humidity Sensor Module, XY-MD02 Temperature Humidity Transmitter Module Transducer SHT20 Sensor Module

Reviews

H**Y

Basic and easy to use

With a quick Google search you can find the product manual. There’s not much to it, but there’s not much to this device. You just power it up and communicate with it RS-485 Modbus RTU.

26.02.2020

D**E

Not accurate and don't calibrate

I bought 3 of these and they are all way off for both temp and humidity. The best one is 10%RH off, and a few degrees. I adjusted the calibration registers, can read back that they were properly written to, but the values it outputs do not change at all. Power cycled them, etc, no change. I will play around with them a little more, but will likely be returning them for a refund.As another customer said, they are well made, its just a shame they aren't accurate and don't calibrate.Upon further inspection, this product doesn't even use the sensor listed on the product page (SHT20), it has a SHTC3 sensor...

28.06.2022

R**P

Its ok

I bought this sensor for a home automation project based on an Allen Bradley Micro820 PLC. The sensor seams to work really well once you get it configured. The available documentation is a nightmare and i dont know if the fault mainly lies with this sensor or with Connected Components Workbench but after many hours of crazy frustration i found the address and speed settings at 0x3 286 not at 0x3 101 as stated in the docs. Then it turned out that the temps and humidity were interpreted strait to c and %, no hex conversion required, which was a bonus at that point. I get nice high resolution trending on the humidity but the temp is not nearly as good.Once i set the new address and comm speed i had to power cycle the unit for it to take effect

17.06.2020

A**R

Poor accuracy makes unusable

Want to like this device. Well put together and modbus works as advertised. Unfortunately, looks like it is uncalibrated. Reading 25% humidity when actually 43%. Reading 98 F (37 C) when actually 73. Purchased 2 of these and neither tracked reality or each other. They provide a calibration register that allows +/- 10 C and +/- 10 %humidity adjustments, but that is insufficient to correct the error and with this much error, don't trust the device to provide calibratable readings.

18.03.2021

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