The SM42-433MHz module manual provides features, specifications, pin definitions, configuration steps and application examples for the 10 mW ISM‑band…
The SM42‑433MHz is a micro‑power ISM‑band wireless communication module offering up to +12 dBm transmit power, selectable carrier frequencies between 423.99 MHz and 441.99 MHz, and data rates from 1.2 kbps to 115.2 kbps. It supports three serial interfaces (UART‑TTL, RS‑232, RS‑485) and includes sleep mode with ultra‑low current consumption.
The manual describes hardware connections, pin functions, parameter setting via MCU or a dedicated debug cable, sleep/wake‑up operation, antenna options, and networking/programming considerations. Technical specifications and a channel‑frequency table are provided for system integration. This manual is written in Chinese.
| Modulation | GFSK |
|---|---|
| Working frequency | 423.99‑441.99 MHz |
| Transmit power | +12 dBm |
| Maximum receive sensitivity | -111 dBm |
| Transmit current | ≤35 mA |
| Receive current | ≤25 mA |
| Sleep current | ≤5 µA |
| Wake‑up time | ≤2.5 s |
| Interface speed | 1200‑115200 bps |
| Interface types | UART(TTL), RS‑232, RS‑485 |
| Operating voltage | +2.5 V to +5.5 V DC |
| Operating temperature | -40 °C to +85 °C |
| Storage temperature | -65 °C to +150 °C |
| Dimensions | 47 mm × 26 mm × 7 mm |
The module provides a transmit power of +12 dBm.
It operates from +2.5 V to +5.5 V DC.
The module supports UART (TTL level), RS‑232 and RS‑485; the user selects one at order time.
In sleep mode the current consumption is ≤5 µA.