RZ706S- THPVCF-RS485

Overview

The instrument is designed for detecting PM2.5 particle concentration in indoor environments and public

open areas. Additionally, it is capable of monitoring various environmental parameters such as

temperature, humidity, air pressure, VOCs (Volatile Organic Compounds), CO2 (Carbon Dioxide), O2

(Oxygen), formaldehyde, and carbon monoxide, making it a highly versatile device.

Main Operating Parameters ：

Modbus RS485, 9600bps, 1 start bit, 8 data bits, 1 stop bit, no parity bit (Optional WiFi,

Signal Output

ZigBee, TCP/IP)

Dimensions 450g/133mm × 133mm × 39mm

Comprehensive Air Quality Monitor's Detection Capabilities and Range (Customers can select different parameter combinations based on their usage requirements):

Main Detection Parameters Detection Range Detection Accuracy Detection Method

PM2.5 Particle Concentration

Volatile Odor Detection (VOC

Oxygen Concentration

Monitoring 0~25.0% VOL <2% FS Electrochemical, 2-year lifespan

Non-dispersive Infrared

Expandable (NO/O3/NO2/NO/SO2/H2S/NH3/VOC/PH3/CL2/HCL/HCN/HF, etc.) Electrochemical principle sensors, up to 4 can be

selected, parameters are determined by the selected sensors.

⚫ Do not connect the transmitter to a voltage higher than 24V DC.

⚫ Refer to Figure 1 for the product's exterior and dimensions diagram when installing the equipment.

⚫ Install the transmitter at the desired detection location, away from heat sources or steam outlets, and

protect it from direct sunlight.

⚫ When wiring the electrical circuit, connect the wires to the terminal blocks, ensuring that the connections

are correct and secure.

Figure 1: Installation DiagramFigure

Starting from the right to the left, the terminals are numbered sequentially as 1-7, with the following

definitions: 1. +12V; 2. GND; 3. RS485A; 4. RS485B; 5. I1/V1; 6. I2/V2; 7. TCP/IP

Communication Protocol :

The device utilizes the MODBUS RTU protocol for communication. In RTU mode, messages are

initiated with a minimum 3.5-character time interval. Devices decode the address field upon reception to

identify messages directed at them. A message concludes with a stop interval of at least 3.5 character times.

Messages are transmitted in a continuous stream; if interrupted by a pause exceeding 3.5 character times,

the receiver aborts the incomplete message and treats the subsequent byte as the address field of a new

message.

1. The hardware uses RS485 for master-slave, half-duplex communication, where the master initiates

communication by calling the slave's address, and the slave responds accordingly.

2. Data frame format: 1 start bit, 8 data bits, 1 stop bit, no parity bit.

4. Message frame includes: address field, function code field, data field, and CRC16 check field.

5. This device supports hexadecimal function codes 03H and 06H (decimal 3 and 6). Code 03H is for reading the

device's register, while 06H is for writing to the device's register.

Device Response Stack Planning ：

Corresponding

Decimal

Register Address

Unit Data Description

Parameter

Point

Default is 1