Ling-TR2H 433 MHz FSK Wireless UART Module

Ling-TR2H module photographed against a centimeter scale
MOQ 100US$3.20per module
In stock3,485modules available
Reference rangeApprox. 600 m*Open line of sight
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Typical applications

For embedded UART links that need more distance.

Use Ling-TR2H where the complete system can operate with half-duplex communication and a 50 Ω antenna matched to the 433 MHz band.

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Wireless control

Transfer control commands, discrete I/O states and status feedback without a cable.

⌁

Data acquisition

Connect low-rate sensor, meter and acquisition-terminal data to a controller.

⌂

Smart devices

Link lighting, appliances and environmental sensors across a local installation.

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Robotics

Support control and status links with moderate real-time requirements.

System operation

Two UART endpoints. One 433 MHz wireless bridge.

Both modules must use matching Net ID, RF channel and UART communication parameters.

UART device AMCU or serial equipmentLing-TR2H
433 MHz RF link
half duplex
UART device BMCU or serial equipmentLing-TR2H

Link behavior: The module automatically switches between transmit and receive. Use polling, request-response, or another application mechanism that prevents simultaneous bidirectional transmission.

Operating band423.92–443.92 MHz
Default frequency433.92 MHz
ModulationFSK
InterfaceUART TTL
Supply1.8–3.6 V
Receiver sensitivity−119 dBm*
DirectionHalf duplex
Reference rangeApprox. 600 m*

Application boundaries

Validate the complete RF link.

Reference range is not a guaranteed installed-system range. Antenna choice, enclosure, power supply, site conditions and interference all matter.

Good starting fit

✓ Both endpoints use IO levels compatible with the module supply.

✓ The application supports half-duplex exchange.

✓ Both ends use matching Net ID, channel and UART parameters.

✓ A 50 Ω antenna is matched to the 433 MHz band.

Check carefully

! Do not directly connect a 5 V UART without checking level compatibility.

! Keep the antenna path clear of metal and large copper areas.

! Verify VCC stability during transmit current peaks.

! Test the final enclosure and installation environment.

* Conditions: Approx. 600 m is a reference line-of-sight value in an open, interference-free environment. Receiver sensitivity is a typical value at 0.6 kbps. Verify the final product under its intended installation conditions.

Technical specifications

Confirmed selection data for Ling-TR2H.

The released Ling-TR2H Datasheet V1.2 remains the authority for final circuit, PCB and antenna decisions.

Operating voltage1.8–3.6 V · typical 3.3 V
Operating band423.92–443.92 MHz
RF channels0–40 · 500 kHz spacing · default channel 20
CommunicationFSK · UART transparent transmission · half duplex
UART baud rate600–115200 bps · default 9600 bps
Receiver sensitivity−119 dBm typical at 0.6 kbps
Transmit power−10 to +20 dBm · default +20 dBm
Transmit / receive current71.5 mA / 13.8 mA typical
Sleep current5 µA typical
AntennaExternal 50 Ω · TT02 spring antenna recommended
PackageSMD
Ling-TR2H front view

Pin assignment

Seven connections

VCC
1.8–3.6 V positive supply; 3.3 V typical.
RXD
Module data input. Connect to MCU TXD; UART TTL level.
TXD
Module data output. Connect to MCU RXD; UART TTL level.
SET
Low: configuration mode. High or floating: transparent transmission mode.
CS
Low: active. High or floating: sleep.
GND / G
Common ground with the MCU or serial device.
A
External 50 Ω antenna interface; TT02 spring antenna recommended.

Operating modes

Three defined states

  1. Transparent modeCS low; SET high or floating. Uses the configured communication baud rate.
  2. Configuration modeCS low; SET low. Fixed at 9600 bps, 8N1 for parameter read/write.
  3. Sleep modeCS high or floating; wireless communication is unavailable.

Sample evaluation

Prove the link before design-in.

Separate serial, RF, antenna and enclosure effects so the team can diagnose the correct layer.

  1. 1

    Build the bench link

    Use two modules and a UART test demo with the factory-default parameters.

  2. 2

    Confirm connections

    Cross TXD/RXD, share GND, keep CS low, and keep SET high or floating.

  3. 3

    Match parameters

    Confirm Net ID, RF channel and UART baud rate at both ends.

  4. 4

    Validate the final product

    Test the antenna, enclosure, installation environment and application protocol before production.

Technical downloads

Files for evaluation and design-in.

Can two modules communicate with factory defaults?

Yes. A two-module communication test can use the factory-default parameters when the circuit is connected correctly.

What must match at both ends?

Net ID, RF channel and UART communication parameters must match.

Is Ling-TR2H full duplex?

No. The wireless link is half-duplex. Use polling or request-response to avoid simultaneous bidirectional transmission.

Which antenna should I use?

Use an external 50 Ω antenna matched to the 433 MHz band; TT02 spring antenna is recommended in the released datasheet.

Purchase options

Start with modules or a development kit.

Module

Ling-TR2H · 433 MHz

SKU: Ling-TR2H-433_V1.0_S1.1 · Stock: 3,485

US$3.20MOQ 100 · per module

Minimum online purchase quantity: 100 modules.

Development kit

Start testing faster

US$69 / set

  • 10 modules
  • 10 antennas
  • 1 pair of test demos
  • Free shipping

SKU: SET-Ling-TR2H-433_V1.0_S1.1 · Stock: 200

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