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I'm a noob in this area, please ignore any stupidity and lack of info and any help is appreciated and I'm ready to provide all clarification on the post if by chance any info is missing.

So i have been working with the following sensors and I have searched a lot for the data sheet of these sensors to talk with them and I was unable to find them. So the problem I'm having now is that I'm not sure which registers are to be read on the temperature/ humidity sensors to get the reading from the sensors. The sensors are given below.

Among the sensors below i have successfully communicated with the 4th sensor (setpoint display) and has an data sheet for an older revision of rev6, but if you guys happen to have the datasheet for rev17 or closer i appreciate it very much. So communicating with that sensor was through Modbus request of 0x0103007700013410 and i got a response of 0x0103020019CFC7 (format). here I'm reading the data from 119 (0x77) register. But I'm unable to communicate with the other sensors as the register to read is unknown. Any help is appreciated thanks in advance. This is a reference I used for understanding and using modbus commands: http://www.like2do.com/learn?s=Modbus

This is the link for the datasheet of the 4th sensor: https://temcocontrols.com/wp-content/uploads/sites/4/2018/07/AQ-N.pdf

Update: I was able to find some info on the second sensor I'll leave it here if somebody in the future may need it sensor 2: https://techsparx.com/energy-system/modbus/simple-modbus-rtu-temperature-sensor.html but I'm still looking for a valid datasheet.

Sensor 1.

Sensor 1.

Sensor 2.

Sensor 2.

Sensor 3.

Sensor 3.

Sensor 4.

Sensor 4.

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  • \$\begingroup\$ You should request the datasheets from the place where you got these units. \$\endgroup\$ – Nick Alexeev Oct 5 '18 at 5:17
  • \$\begingroup\$ I contacted the seller but there is no response yet. So i was looking for any other options. \$\endgroup\$ – ARJUN Oct 5 '18 at 5:34
  • \$\begingroup\$ cardinal rule: No datasheet ⇒ No sale \$\endgroup\$ – Nick Alexeev Oct 5 '18 at 5:38

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