DQA-IOT RS485 Port T/H Sensor Probe over Modbus Protocol Product Manual

 1. Product overview

DAQ-GP-THRS485 is a high precision temperature and humidity transmitter, beautiful and compact, simple wiring, easy to install. The use of imported high-precision probes ensures the excellent measurement performance of the product. Super stability and anti-interference ability, strong product protection performance, a level of lightning protection. RS485 interface, multiple modules can be connected to the bus network, and can monitor multiple on-site environments in real time.

 

2. Scope of application

 

This product is widely used in communication computer room, intelligent building, workshop, warehouse, pharmacy, library, museum, laboratory, office, ventilation duct, greenhouse and other places.

 

3. Product characteristics

 

Ø RS485 interface, communication distance up to 1200 meters.

Ø Imported probe, high precision, wide range, good consistency.

Ø standard guide rail structure design, easy to install.

Ø Super stability and anti-interference ability.

Ø Wide voltage input, DC5-24V.

Ø The standard MODBUS RTU protocol.

Ø Strong protection performance, one level lightning protection.

 

4. Main technical parameters

 5. Installation and wiring instructions

 

Red line: VCC: positive power supply, DC5V-32V;

Black line: GND: Power negative, signal ground;

Yellow line: RS485-A; Communication differential signal

Green line: RS485-B; Communication differential signal;

 

 

 

6. Communication protocol

1、All communication circuits should follow master/slave mode. In this way, data can be passed between one primary station (e.g., PC) and multiple sub-stations. No communication can start from a sub-station.

2、The information transmission mode is asynchronous. The byte format is 1 bit start bit, 8 bit data bit, and 1 bit stop bit. No check is required.

3、Complies with MODUBS RTU protocol standards.

4、The default baud rate is 9600 and the address is 1.

Master send

Back:

Internal message information:

 

7. Command example

 

Read temperature and humidity：01 03 00 00 00 02 C4 0B （The address is 1, and the temperature and humidity value are read）

Back：01 03 04 00 B8 03 3F 3A F6 （Corresponding temperature: 18.4℃, humidity: 83.1%）

 

Read address：FF 03 00 64 00 01 D0 0B     

 

Address：01 06 00 64 00 02 49 D4   （The original address is known to be 01, so change it to 02）

 

            FF 06 00 64 00 02 5C 0A   （Unknown original address, change it to 02）

 

8. Quality assurance

 

    Warranty period is 12 months. During the quality guarantee period, free maintenance service is provided for the product based on normal use and non-human damage.

 

9. Matters needing attention

 

1, do not install directly in the heat source, cold source, or under the sun.

2. It is forbidden to be in steam, water mist, water curtain or condensation environment for a long time.

3, in the dust or other polluted environment, the product must be cleaned regularly.