Introduction: What Is a High-Temperature Wireless Serial Module?
In industrial automation, automotive manufacturing, metal smelting and oil extraction, many devices must run reliably for long periods in high-temperature environments (up to 150℃). Ordinary wireless modules typically support only -40℃ ~ +85℃; above 100℃ their RF performance degrades sharply or they may be permanently damaged, failing to meet high-temperature requirements.
A high-temperature wireless serial module is purpose-built to solve this. It uses specially selected and designed components to maintain stable RF performance and reliable data communication at ambient temperatures up to 150℃ — an ideal choice for power grids, defense, automotive and metal smelting applications.
The EWM35T-2G4T06SP from Chengdu EBYTE Electronic Technology Co., Ltd. is a high-temperature wireless serial module in the 2.4GHz ISM band. It supports a wide -40℃ ~ +150℃ operating range and offers wireless transparent transmission, point-to-point, broadcast, serial upgrade and communication encryption, providing a reliable wireless data solution for high-temperature environments.
Who Needs It
The EWM35T-2G4T06SP serves four core user groups:
| User Group | Typical Profile | Core Pain Point | Module Solution |
|---|---|---|---|
| Grid equipment engineers | Power system engineers, maintenance staff | Substation and switchgear interiors are extremely hot; ordinary modules fail, affecting equipment monitoring and data reporting | 150℃ heat tolerance for long-term reliable operation, ensuring real-time power-equipment monitoring data |
| Defense equipment developers | Defense electronics engineers, integrators | Military equipment faces extreme heat (engine rooms, weapon systems), requiring high reliability and environmental adaptability | Industrial wide-temperature (-40℃~+150℃) plus efficient watchdog for stable operation in extreme environments |
| Automotive electronics engineers | Automotive parts engineers, Tier-1 suppliers | Engine bays, exhausts and turbochargers are extremely hot; ordinary modules cannot survive, needing a heat-tolerant wireless solution | -40℃~+150℃ wide temperature for wireless sensor data and remote control in engine bays |
| Metal smelting engineers | Metallurgical automation engineers, maintenance staff | Blast furnaces, rolling mills and heat-treatment furnaces are extremely hot; wired cables age and fail, needing a reliable wireless alternative | Heat-tolerant design for long-term 150℃ use, replacing wired links in hot zones to cut maintenance and boost productivity |
Product Overview
Introduction
The EWM35T-2G4T06SP is a next-generation 2.4GHz high-temperature wireless serial module designed by EBYTE. It offers multiple transmission modes, operates in the 2400~2480MHz band, uses a standard stamp-hole SMD package and provides a UART interface for easy development. It supports wireless transparent transmission, point-to-point, broadcast, serial upgrade and communication encryption, with customization services available.
Core Configuration
| Parameter | Specification |
|---|---|
| Model | EWM35T-2G4T06SP |
| Manufacturer | Chengdu EBYTE Electronic Technology Co., Ltd. |
| Frequency band | 2.4GHz ISM (2400~2480MHz) |
| Max TX power | 6dBm |
| Interface | UART serial |
| Package | Stamp-hole SMD |
| Antenna | On-board PCB antenna |
| Highlight | Supports -40℃ ~ +150℃ high-temperature operation |
Features
Core Advantage: 150℃ High-Temperature Design
Wide operating range: Long-term use at -40℃ ~ +150℃ — one of the few wireless serial modules supporting 150℃ on the market.
Special component selection: Strictly screened and tested heat-tolerant components keep RF performance stable and communication reliable at extreme temperatures.
Efficient watchdog: Ensures stable program operation at high temperature; on anomaly the module auto-restarts and continues with previous parameter settings.
Rich Wireless Communication Functions
Transparent transmission: Default mode — packages UART-received data and sends it wirelessly; the receiver outputs wireless data directly over UART.
Point-to-point transmission: Supports target address and channel setting to send data precisely to a specified device.
Broadcast transmission: Set broadcast address to 0xFFFF and channel to the target channel to broadcast to all devices on that channel.
Channel monitoring: Set the module address to 0xFFFF to monitor all data on a specified channel for network diagnostics.
Communication encryption: Supports a communication key for high data security, preventing interception and decoding.
Reliable Hardware Design
On-board PCB antenna: No external antenna needed — simplifies design and lowers cost.
Standard stamp-hole package: 1.27mm pin pitch, easy to solder and mass-produce, suited to industrial use.
Efficient watchdog: Keeps the program stable at high temperature and auto-recovers from anomalies.
Easy Configuration & Upgrade
AT command configuration: Configure and query parameters including work mode, address, channel, UART baud rate, air rate and TX power.
Serial upgrade: Firmware upgrade over UART for easy field maintenance and feature updates.
Bluetooth OTA upgrade: Firmware upgrade over Bluetooth without cables, for extra convenience.
Technical Parameters
RF Parameters
| RF Parameter | Value | Notes |
|---|---|---|
| Frequency band | 2400 ~ 2480 MHz | ISM band |
| TX power | 6 dBm | Software adjustable |
| RX sensitivity | -98 dBm | — |
| FIFO | 2000 Byte | Internal buffer |
| Packet length | 30 ~ 240 Byte | Software adjustable, default 240 |
| UART baud rate | 9600 ~ 921600 bps | Software adjustable, default 9600 |
| Air rate | 500Kbps ~ 1Mbps | Software adjustable, default 500Kbps |
| Modulation | GFSK | — |
| Range | 230m | Clear open air, on-board PCB antenna, 1.5m height, 500kbps |
Hardware Parameters
| Hardware Parameter | Description |
|---|---|
| Interface | UART |
| Package | SMD |
| Interface type | Stamp hole, 1.27mm pitch |
| Size | 23.0 × 16.0 mm (±0.2mm) |
| Antenna | On-board PCB antenna, ~50Ω |
| Weight | 1.28g (±0.1g) |
Electrical Parameters
| Electrical Parameter | Min | Typical | Max | Unit | Notes |
|---|---|---|---|---|---|
| Supply voltage | 1.9 | 3.3 | 3.8 | V | ≥3.3V ensures output power; >3.8V permanently destroys |
| Logic level | — | 3.3 | — | V | Use level shifting with 5V TTL |
| TX current | — | 12 | — | mA | At 6dBm, 50Ω antenna |
| Sleep current | — | 3.0 | — | μA | Software shutdown |
| Operating temp | -40 | — | 150 | ℃ | High-temperature core spec |
| Operating humidity | — | 60 | 90 | % | — |
| Storage temp | -40 | — | 150 | ℃ | — |
Pin Definition (excerpt)
| Pin | Name | Function |
|---|---|---|
| 12 | PA04 SLEEP | Low-power control: pull low to wake, pull high to sleep |
| 13 | PA06 RTS | Standard hardware flow control, Request To Send (module output) |
| 14 | PA05 CTS | Standard hardware flow control, Clear To Send (module input) |
| 15 | VCC | Power positive 1.9~3.8V, 3.3V recommended |
| 18 | PC00 TXD | Serial output |
| 19 | PC01 RXD | Serial receive |
| 26 | RESET | Module reset, active low, internal pull-up |
| 27-28 | GND | Module ground |
Application Scenarios
Power-Grid Equipment Monitoring
Recommended: EWM35T-2G4T06SP
Embed the module into temperature/vibration sensors in substations,
high-voltage switchgear and transformers, where interior temperatures
can exceed 100℃. It collects equipment status data in real time at high
temperature and transmits it wirelessly to a monitoring center for
remote monitoring and early warning.
Advantages: 150℃ heat tolerance for long-term stable
operation; 2000-byte FIFO supports 100kbytes continuous transmission for
large data uploads.
Defense Equipment Wireless Communication
Recommended: EWM35T-2G4T06SP
In engine bays and weapon systems of military vehicles, ships and
aircraft, the module delivers sensor data collection and control-command
transmission. Its wide temperature range and efficient watchdog ensure
stable operation in extreme environments, meeting defense-grade
reliability requirements.
Automotive Engine-Bay Wireless Sensors
Recommended: EWM35T-2G4T06SP
Engine bays are extremely hot and wired sensor harnesses age and break.
Embed the module into engine-temperature, exhaust-temperature and
turbo-pressure sensors to replace wired links, reducing harness weight
and improving reliability and flexibility.
Advantages: 150℃ heat tolerance for engine-bay mounting; on-board PCB antenna, no external antenna, easy installation.
Metal Smelting Process Monitoring
Recommended: EWM35T-2G4T06SP
Around blast furnaces, rolling mills, heat-treatment and melting
furnaces, the environment is extremely hot with metal dust and EMI.
Embed the module into temperature, pressure and flow sensors to collect
process data in real time and transmit it wirelessly to a central
control room for remote monitoring and optimization.
Advantages: 150℃ heat tolerance; communication encryption keeps process data secure.
FAQ
Poor Transmission Range
Line-of-sight obstructions attenuate range accordingly.
Temperature, humidity and co-channel interference increase packet loss.
Ground absorption/reflection: testing near the ground degrades performance.
Seawater strongly absorbs RF; testing near the coast performs poorly.
Metal objects near the antenna or a metal enclosure heavily attenuate the signal.
Incorrect power-register settings or excessive over-the-air rate (higher rate = shorter range).
Supply below the recommended level — lower voltage reduces TX power.
Poor antenna–module matching or low antenna quality.
Module Easily Damaged
Check the supply is within the recommended range; exceeding the maximum can permanently damage the module.
Ensure supply stability — avoid large, frequent voltage fluctuations.
Follow ESD precautions during installation; high-frequency components are ESD-sensitive.
Keep humidity in check during installation; some components are moisture-sensitive.
Unless necessary, avoid operation at extremes of temperature.
How to Configure Module Parameters?
The module supports configuration via AT commands. Use a serial tool (e.g. XCOM) to set work mode, address, channel, UART baud rate, air rate and TX power. The module has two work modes: transmission mode (Mode 0) and configuration mode (Mode 1). In configuration mode, the serial port is fixed at 9600 8N1; parameter changes take effect after switching modes and are saved on power-off.
How to Enter Sleep Mode?
Sleep is disabled by default and must be enabled in configuration mode. Once enabled, control via the SLEEP pin: pull high to sleep, pull low to wake. In sleep mode, total consumption is ~3μA, ideal for battery-powered low-power applications.
About EBYTE
Founded in 2012, Chengdu EBYTE Electronic Technology Co., Ltd. is a national high-tech enterprise integrating R&D, production and sales. Headquartered in Chengdu with offices in Shenzhen, Guangzhou, Shanghai and Beijing, it serves customers in over 100 countries and regions worldwide. EBYTE focuses on industrial IoT wireless communication, with a portfolio spanning wireless modules, radio modems, industrial gateways, network I/O, industrial PCs, antennas and accessories.
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