LM048-3001

BLUETOOTH MODULE, V2.0/2.1, 3MBPS

⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.

Manufacturer: LM TECHNOLOGIES
Product type: Bluetooth Modules & Adaptors
Bluetooth Version:Bluetooth 2.0, 2.1; Supply Voltage Min:4V; Supply Voltage Max:12V; Signal Range Max:100m; Data Rate:3Mbps; Bluetooth Class:Class 1; Receive Sensitivity:-86dBm; Operati
SVHC: No SVHC (17-Dec-2015)
Interfaces: SPI, RS232
Product Range: -
Certifications: -
Bluetooth Class: Class 1
Bluetooth Version: Bluetooth 2.0, 2.1
Supply Voltage Range: 4 V to 12 V
Receiver Sensitivity Rx: -86 dBm
Operating Temperature Range: -10 °C to 70 °C

Delivery and price
Units per pack	10
Price	79.27 €
Current stock	10+
Lead time	30 days

Datasheet

## **LM048 Bluetooth® v2.0, v2.1 RS232 Serial Adapter** 

Standalone (With Embedded Bluetooth® v2.0 / v2.1 Stack) 

Product LM048 Part No See Last Page Revised 10/JUL/2019 Datasheet Version 2.3 

**==> picture [201 x 124] intentionally omitted <==**

**----- Start of picture text -----**<br>
46.3mm<br>16mm<br>'<br>34mm EN<br>**----- End of picture text -----**<br>


## **Features** 

- World’s smallest Bluetooth® Serial Adapter (RS232) 

   - Full Duplex for simultaneous communication between sender and receiver 

- Bluetooth® ® v2.0, v2.1 wireless technology 

- e dBm Outputs TBA (expecting as previous version (18 dBm Tx Output Power and -86 dBm Rx Sensitivity) 

- Serial (RS232) interface 

- ee 

   - Configurations pre-installed on production 

   - RoHS, REACH and WEEE Compliant Solution 

- Programmable Standalone Module (With Embedded Bluetooth® v2.0 / v2.1 Stack) 

Up to 100m range (in open space) 

- 46.3mm x 34mm x 16mm 

## **Typical Industries** 

- Powered by USB - Mini USB, DB9 or AC adaptor 

- DTE / DCE (Master / Slave) mode switch 

- DTR / DSR Handshaking and RTS / CTS Flow control lines 

EPOS e Automotive Aviation e LNG M2M 

## **Overview** 

## **The LM048 is the world’s smallest Bluetooth® serial adapter (RS232), providing a secure and reliable Bluetooth® v2.0, v2.1 connection.** 

This wireless connection reaches a range of up to 100m in open space, replacing RS232 cables between a master (DTE) device and slave (DCE) devices such as printers, data loggers and digital signalling devices. 

The LM048 patented firmware allows the serial configurations to be used. The firmware controls the RS232 signals, including DTR / DSR handshaking and RTS / CTS flow control lines. The LM048 is powered by USB - Mini USB, DB9 or AC adaptor and all settings and configurations are even retained when the adapter is powered down. 

Our LM149 software is used to change the settings and configurations; including the auto connect function, discoverable / non-discoverable function, device name, baud rate, data bits and flow control. The AT Command set is used to change the configurations, plus the developer can also configure and modify the settings of a remote LM048 from a local LM048. Customised configurations and settings can be preloaded to the LM048, simplifying the manufacturing and testing process. 

**LM048** 

**+44(0) 207 428 2647 | sales@lm-technologies.com** 

Page 1 of 6 

**LM048 Bluetooth® v2.0, v2.1 RS232 Serial Adapter** Standalone (With Embedded Bluetooth® v2.0 / v2.1 Stack) 

|Product|LM048|
|---|---|
|Part No|See Last Page|



## 

|Wireless||
|---|---|
|Bluetooth® Standard|v2.0 and v2.1 wireless technology|
|Adapter Type|Standalone (Configurable with AT Commands)|
|Profiles|SPP|
|Hardware||
|Chipset|CSR|
|Antenna|IC Antenna Onboard|
|Flash Memory|8 Mbit|
|RAM|48 KB|
|Interfaces|Serial (RS232)|
|Power Supply|4V to 12V DC|
|Crystal Oscillator|16 MHz|
|LED Indicators|Link (BLUE), Data (ORANGE) and Power (RED)|
|RS232 (Serial)||
|RS232 Interface|D_SUB 9 pin female|
|Signal|RxD, TxD, DTR, DSR, RTS, CTS and GND|
|Full Duplex|Yes|
|Baud Rate|1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6, 115.2, 230.4, 460.8 and 921.6 Kbps|
|RF Characteristics||
|Tx Output Power|18 dBm (Maximum)|
|Rx Sensitivity|-86 dBm (Typical)|
|Antenna Gain|1 dBi to 2 dBi (Maximum)|
|Current Consumption|90 mA (Typical)|
|Range (in open space)|Up to 100m|
|Data Rate|Up to 3Mbps|
|Frequency|2.4 GHz to 2.485 GHz|
|Hopping|1,600/sec, 1MHz channel space|
|Modulation Scheme|GFSK-Mbps, DQPSK-2 Mbps, and 8-DPSK-3Mbps|
|Physical Characteristics||
|Operating Temperature|-10°C to +70°C|
|Dimensions (L x W x H)|46.3mm x 34mm x 16mm|
|Weight|20.19g +/- 0.25g tolerance|
|Certifications|See our website for this products certifications.|
|Compliance|RoHS, REACH and WEEE|



**LM048** Page 2 of 6 

**+44(0) 207 428 2647 | sales@lm-technologies.com** 

**LM048 Bluetooth® v2.0, v2.1 RS232 Serial Adapter** Standalone (With Embedded Bluetooth® v2.0 / v2.1 Stack) 

Product LM048 Part No See Last Page 

**==> picture [40 x 12] intentionally omitted <==**

**----- Start of picture text -----**<br>
Signals<br>**----- End of picture text -----**<br>


**==> picture [179 x 100] intentionally omitted <==**

**----- Start of picture text -----**<br>
5 4 3 2 1<br>5000 ¢ Female DB9<br>ay .<br>9 8 7 6<br>**----- End of picture text -----**<br>


## **Pin out for LM048 Adapter** 

|Pin|RS232 Signal|RS232 Signal|DTE to DCE Direction|DCE to DTE Direction|Description|
|---|---|---|---|---|---|
|1|CD||Input|Output|Not Connected|
|2|RxD||Input|Output|Receive Data|
|3|TxD||Output|Input|Transmit Data|
|4|DTR||Output|Input|Data Terminal Ready|
|5|GND||n/a|n/a|Signal Ground|
|6|DSR||Input|Output|Data Set Ready|
|7|RTS||Output|Input|Request to Send|
|8|CTS||Input|Output|Clear to Send|
|9|Vcc||Input|Input|Power Supply|



## **Factory Settings** 

The factory settings of the COM Port are as follows: 

Baud Rate 19200 bps Data Bits 8 Parity None Stop Bits 1 Flow Control None 

and Flow Control Settings. 

**LM048** 

**+44(0) 207 428 2647 | sales@lm-technologies.com** 

Page 3 of 6 

## **LM048 Bluetooth® v2.0, v2.1 RS232 Serial Adapter** 

Standalone (With Embedded Bluetooth® v2.0 / v2.1 Stack) 

**==> picture [179 x 125] intentionally omitted <==**

**----- Start of picture text -----**<br>
7<br>6<br>COS<br>AE? O<br>1<br>3 [2]<br>5 SSeSZ Vas 4<br>**----- End of picture text -----**<br>


## **Hardware Structure** 

- **1** Link LED. 

- **2** Data LED. **3** Power LED. 

- **4** Mini USB Connector. **5** RS232 Connector. **6** Slide Switch. 

- **7** Reset Button. 

Product LM048 Part No See Last Page 

## **Switch Functions** 

Reset Button 

By pressing the Reset Button you can: 

Disconnect a wireless connection (after a short press). Restore the factory settings (after over 3 seconds press). 

## Slide Switch 

The slide witch can swap TxD / RxD, RTS / CTS and DTR / DSR Signals. By switching, you can set the adapter as a DTE (towards antenna connector) or a DCE (towards RS232 connector). 

## **Physical Dimensions** 

**LM048** 

**+44(0) 207 428 2647 | sales@lm-technologies.com** 

Page 4 of 6 

## **LM048 Bluetooth® v2.0, v2.1 RS232 Serial Adapter** 

## Standalone (With Embedded Bluetooth® v2.0 / v2.1 Stack) 

Product LM048 Part No See Last Page 

|v1.0|13 MAR 2018|Added version notes to datasheet.|
|---|---|---|
|v1.1|1 MAY 2018|Existing Part Numbers end of life (due to hardware change).|
|v2.0|1 MAY 2018|New LM048 version 3 release (with new power amplifier replacing previous).|
|v2.1|16 MAY 2018|New Part Numbers released for LM048 version 3.|
|v2.2|10 SEP 2018|Packing Description typo amended (DB9 male to male (not male to female))|
|v2.3|10 JUL 2019|Packing Page Revised and Extra Options added|



## **Helpful Notes** 

## **Download the latest software and from** 

lm-technologies.com/btserial 

## **Download any further documention to assist with your** 

## **device setup, such as;** 

Manual, Quick Start & Pairing Guides, Troubleshooting, Notes, Certifications, Applications and Datasheet. 

## **Need support? Visit our FAQ Support Site** 

lm-technologies.com/support 

**LM048** 

**+44(0) 207 428 2647 | sales@lm-technologies.com** 

Page 5 of 6 

## **LM048 Bluetooth® v2.0, v2.1 RS232 Serial Adapter** 

Standalone (With Embedded Bluetooth® v2.0 / v2.1 Stack) 

Product LM048 Part No See Below 

## **LM048 Packaging Options** 

**048-3000 AO - Adapter Only** 

1 x Bluetooth® Serial Adapter 

## **048-3001 SWB - Single White Box** 

- 1 x Bluetooth® Serial Adapter 

- 1 x DB9 Gender Changer - male to male 

## **048-3006** 

## **SRP - Single Retail Pack** 

- 1 x Bluetooth® Serial Adapter 

- 1 x DB9 Gender Changer - male to male 

- 1 x USB - mini USB Cable for power supply 

- 1 x Power Supply Unit with Multi-Plug faces, + UK Plug Connector for USB Cable 

## **048-3011 TWB - Twin White Box** 

- 2 x Bluetooth® Serial Adapters 

- 2 x DB9 Gender Changers - male to male 

**048-3012** 

## **TRP - Twin Retail Pack** 

- 2 x Bluetooth® Serial Adapters 

- 2 x DB9 Gender Changers - male to male 

- 1 x USB mini USB Cable for power supply 

- 1 x Power Supply Unit with Multi-Plug faces, 

   - + UK Plug Connector for USB Cable 

Optional - LM025 Slim Line 9 pin to 25 pin Convertor 

See our website to download any applicable Product Software, Manuals and Notes  - http://www.lm-technologies.com/downloads 

**LM048** Page 6 of 6 

**+44(0) 207 428 2647 | sales@lm-technologies.com**

Updated at April 28, 2026

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