> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# RS485 Temperature & Humidity Sensor

**Type:** Product page · **SKU:** SEN0438 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/rs485-temperature-humidity-sensor.html ([markdown](https://core-electronics.com.au/rs485-temperature-humidity-sensor.html.md))

This is a high-precision industrial-grade RS485 temperature and humidity sensor. It uses high-quality digital integrated transducer and reliable digital processing...

## Pricing

- **Price:** $50.25 (inc GST) — $45.68 AUD, exc GST
- **Quantity discounts:** 6+ $43.40 (exc GST) · 12+ $41.57 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today, and up to 300 more in 8–12 days.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=SEN0438:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/SEN0438:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

This is a high-precision industrial-grade RS485 temperature and humidity sensor. It uses high-quality digital integrated transducer and reliable digital processing circuit to convert the temperature and humidity in the environment into corresponding RS485 signals. And it can reliably carry out centralized monitoring jobs with the host computer system.

![](https://core-electronics.com.au/media/wysiwyg/product_images/sen0438-Product-Dimension.jpg)

Featuring a wide measurement range, a high detection accuracy, and a fast response speed, the module supports temperature detection of -40 to 120 degrees and humidity detection of 0 to 99.9% RH. Fully wrapped by the aluminum alloy shell, the sensor is waterproof and heat resistant, which makes it suitable for harsh environments. Besides, its probe employs a breathable and dust-proof design that effectively protects the internal circuit board and prolongs the service validity period.

![](https://core-electronics.com.au/media/wysiwyg/product_images/RS485-Temperature-and-Humidity-Sensor.jpg)

The product has remarkable long-term stability, low latency, high resistance to chemical pollution, and superior repeatability. It is an ideal solution for accurately measuring relative humidity and temperature in HVAC(Heating, ventilation, and air conditioning) applications. This sensor can be widely used in building automation, climate and HVAC automatic control, climatology stations in museums and hotels, closed-loop control of HVAC systems, etc.

### Specification

- Temperature Measurement Range: -40 ~ 120°C
- Humidity Measurement Range: 0 ~ 99.9%RH
- Temperature Accuracy: ± 0.3°C (25°C)
- Humidity Accuracy: ± 2%RH (25°C)
- Sampling Cycle Period: 3 sec
- Power Supply Voltage: 12 ~ 36V (DC)
- Product Size: 200mm(L) × 15.7mm(D) / 7.87×0.62”
- Output Signal: RS485 signal
- Communication Protocol: standard MODBUS RTU protocol
- Baud Rate: 9600 (default)
- Display Resolution: Temperature: 0.1°C; Humidity: 1%RH
- Product Net Weight: 110.0g
- Sensitivity Attenuation Value: temperature<0.1°C/year; humidity<0.5%RH/year
- Wire Sequence: 
    - yellow wire - RS485 A
    - red wire - power input
    - black wire - GND
    - white wire - RS485 B
 
### MODBUS Parameters:

 ● **Request frame:** transmitter address + 0x03 + register start address (2 bytes) + register quantity (2 bytes) + CRC (low byte + high byte) ● **Response frame:** transmitter address + 0x03 + byte count (1 byte) + data 0..n + CRC (low byte + high byte) ### Serial Parameters: 

  **● Start bits: 1**  **● Stop bits: 1**  **● Parity: None (N)** — i.e., 8N1 (8 data bits, no parity, 1 stop bit ### Resources

[Instruction Manual](https://core-electronics.com.au/attachments/localcontent/SEN0438-EN_14173a41188.pdf)

### Shipping List

- RS485 Temperature Humidity Sensor x1

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/s/e/sen0438.jpg)