LM048 - Class 1 Bluetooth RS232 Serial Adapter 100m | LM Technologies
料号： LM048 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $49.5 | $49.50 |
| 10 | $44.55 | $445.50 |
| 100 | $39.6 | $3,960.00 |
| 500 | $35.64 | $17,820.00 |
| 1,000 | $31.68 | $31,680.00 |
LM048 概述
A Bluetooth® serial adapter is a self-contained cable-replacement module that bridges a wired RS232 UART interface to a Bluetooth SPP/Serial Port Profile link. Inside the adapter, a Bluetooth baseband IC handles the v2.0/v2.1 + EDR radio (Class 1, up to +18 dBm Tx) and the SPP stack; an RS232 transceiver converts UART logic levels to the ±5 V to ±15 V signaling required by RS232 peripherals. Pairing is transparent to the host: RS232 control lines DTR, DSR, RTS, and CTS are replicated end-to-end over the wireless link via the LM048's patented firmware, allowing legacy Windows/Linux serial applications to operate without modification.
The headline specifications include Bluetooth® v2.0/v2.1 with EDR (3 Mbps nominal), Class 1 output power (approximately +18 dBm Tx), -86 dBm Rx sensitivity, and adaptive frequency hopping across the 2.402 GHz to 2.480 GHz ISM band. The adapter accepts RS232-standard baud rates (typical coverage 1.2 kbps up to 460 kbps per public listings) and operates from -20 °C to +75 °C. Power can be sourced from RS232 Pin 9 (4 V to 13 V) or from a Mini-USB port, and the plastic housing exposes a slide switch plus LEDs for status and pairing feedback.
A pair of LM048 adapters using their unique hardware and firmware combination can act as a transparent serial cable replacement, removing the need for driver changes on the host. The unit carries relevant Bluetooth SIG certifications and CE/FCC compliance marks as listed in the manufacturer datasheet.
Typical applications include industrial RS232 cable replacement, factory-floor data loggers, point-of-sale printers, bar-code scanners, and remote telemetry units. Designers typically route 5 V to 9 V to Pin 9 and connect TX/RX directly to the host UART bridge.
When designing a drop-in cable-replacement node, choose between powering from the RS232 Pin 9 line or USB Mini; a pair of LM048 units gives a true transparent null-modem replacement. Note that throughput tops out near the 460 kbps baud ceiling and the radio is limited to Bluetooth v2.0/v2.1 + EDR, not BLE 5.x.
This page synthesizes distributor pricing for the LM048, same-brand LM Technologies variants (LM048 v2, LM058, LM400, LM072) and practical drop-in guidance not collected in the manufacturer datasheet.
直接替换替代料： LM048 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LM048 （相同外形与封装尺寸） ——差异在于 Bluetooth Version, Product Type.
快速对比工具——选择替代料号进行并排对比：
LM048-3001
✅ 直接替换📋 参考替代料（不在目录中）
LM048-3012
✅ 直接替换📋 参考替代料（不在目录中）
LM048v2
✅ 直接替换📋 参考替代料（不在目录中）
LM058
✅ 直接替换📋 参考替代料（不在目录中）
LM072
✅ 直接替换📋 参考替代料（不在目录中）
LM400
✅ 直接替换📋 参考替代料（不在目录中）
LM048 规格参数（制造商发布）
| Product Type | Bluetooth Serial Adapter (RS232 cable replacement) |
| Bluetooth Version | v2.0 / v2.1 + EDR |
| Bluetooth Class | Class 1 |
| Data Rate (Nominal) | 3 Mbps (EDR) |
| Rx Sensitivity | -86 dBm |
| Operating Frequency | 2.402 GHz to 2.480 GHz (ISM) |
| Modulation | GFSK / π/4-DQPSK / 8-DPSK |
| Frequency Hopping | Adaptive FHSS, 79 channels |
| Range (Open Space) | Up to 100 m |
| RS232 Interface | DB-style RS232, full DTR/DSR/RTS/CTS replicated |
| Baud Rate Coverage | 1.2 kbps to 460 kbps |
| Power Supply (RS232 Pin 9) | 4 V to 13 V DC |
| Power Supply (Mini-USB) | 5 V via Mini-USB |
| 工作温度 | -20 °C to +75 °C |
| Housing | Plastic enclosure, slide switch, status LEDs |
| Profiles | SPP (Serial Port Profile) |
| Antenna | Internal onboard antenna |
| Certifications | Bluetooth SIG, CE, FCC (per datasheet) |
LM048 接口与连接器
LM048 提供制造商发布的以下接口和连接器：蓝牙, USB。扩展排针引脚定义、连接器引脚编号和电气限值在制造商文档中定义。
| 蓝牙 | v2.0 / v2.1 + EDR |
| USB | 5 V via Mini-USB |
请参阅 制造商文档 以查看完整的扩展排针引脚和连接器引脚编号。
功率与热特性
| 工作温度 | -20 °C to +75 °C |
LM048 的功率输入和热参数（由制造商发布）。
典型应用
LM048 适用于 7 应用s: Industrial RS232 Cable Replacement, Point-of-Sale Printer and Bar-Code Scanner Wireless Link, Remote Data Logger Tether Replacement, Medical and Laboratory Instrument Wireless Bridge, Building Automation and HVAC Controller Link, Automotive Diagnostics and Service Equipment, Outdoor Sensor and Telemetry Node Cabling Reduction.
Industrial RS232 Cable Replacement
The LM048's 100 m Class 1 Bluetooth® v2.0/v2.1 + EDR link and replicated DTR/DSR/RTS/CTS control signals make it a true drop-in replacement for wired RS232 in industrial settings. Plant-floor PLCs, legacy data loggers, and weigh scales that speak RS232 can run their existing host software unchanged because the LM048 presents a transparent null-modem replacement; the -20 °C to +75 °C operating range covers most factory environments and the 4 V to 13 V Pin 9 power input accepts common RS232 rail voltages without external regulators. Where throughput matters, the 460 kbps baud ceiling is more than adequate for SCADA polling and serial telemetry.
推荐
Point-of-Sale Printer and Bar-Code Scanner Wireless Link
POS printers, bar-code scanners, and receipt terminals that expose RS232 can be untethered with the LM048, allowing repositioning of checkout hardware without re-cabling. The internal onboard antenna and 100 m open-space range give enough reach for retail floor layouts, and the SPP (Serial Port Profile) support pairs transparently with embedded serial stacks in POS terminals. Power can be drawn from RS232 Pin 9 (4 V to 13 V) on powered hosts or from a Mini-USB cable when the host cannot source enough current, which is common on USB-to-serial bridge boards in slim POS hardware.
推荐
Remote Data Logger Tether Replacement
Field data loggers that stream RS232 telemetry to a host PC can drop the LM048 in place of a long serial cable, dramatically improving deployability for temporary measurement campaigns. The adapter's -86 dBm Rx sensitivity and adaptive FHSS hopping across 79 channels give a robust link even in electrically noisy industrial environments, while the 1.2 kbps to 460 kbps baud coverage accommodates slow instrumentation telemetry and faster binary downloads alike. Battery-powered hosts can use the Mini-USB input for clean isolated power when RS232 Pin 9 voltage is unreliable.
推荐
Medical and Laboratory Instrument Wireless Bridge
Laboratory analyzers and medical instruments with RS232 service ports benefit from the LM048's plastic enclosure and -20 °C to +75 °C range, which covers typical clinical and lab conditions. The replicated RTS/CTS hardware flow-control signaling allows legacy instruments that depend on hardware flow control to operate unmodified over Bluetooth SPP. The Bluetooth SIG certification and CE/FCC compliance marks listed in the manufacturer datasheet help when integrating into regulated medical device workflows, although end-system compliance remains the integrator's responsibility.
推荐
Building Automation and HVAC Controller Link
Building automation controllers, HVAC service ports, and access-control panels that expose RS232 can be commissioned and serviced wirelessly with the LM048, eliminating the need to carry long serial cables to rooftop units and machine rooms. The 100 m Class 1 range covers most building floor spans, and the dual power inputs (4 V to 13 V Pin 9 or Mini-USB) let technicians power the adapter from a laptop or a wall wart when the equipment is unpowered. Pairing via the LM048's slide switch plus status LEDs gives a clear local indication during field setup.
推荐
Automotive Diagnostics and Service Equipment
Automotive diagnostic tools, ECU programming benches, and dealership service equipment that rely on RS232 can adopt the LM048 for short-range wireless diagnostics, freeing technicians from the cable tether at the workbench. The replicated control signals matter for protocols that depend on DTR/RTS toggling for ECU wake-up and bus selection, and the plastic housing tolerates typical garage handling. Operating temperature -20 °C to +75 °C covers most garage conditions, though extreme cold-soak testing below -20 °C is not supported per the datasheet.
推荐
Outdoor Sensor and Telemetry Node Cabling Reduction
Outdoor weather stations, environmental sensors, and remote telemetry units that stream RS232 can use the LM048 to eliminate long, vulnerable outdoor cable runs. The 100 m Class 1 range comfortably spans typical site layouts, and the internal onboard antenna removes the need for external SMA cabling that would otherwise have to be weatherproofed. Power is drawn from the host's RS232 Pin 9 rail or from a Mini-USB solar-backed supply, giving flexible deployment without trenching for cable conduits.
推荐
推荐产品汇总
工程参考数据： LM048 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LM048-3001 | LM048-3012 | LM048v2 | LM058 | LM400 |
|---|---|---|---|---|---|---|
| Package | Plastic enclosure, DB-style RS232 | Plastic enclosure, DB-style RS232 - same | Plastic enclosure, DB-style RS232 - same | Plastic enclosure, DB-style RS232 - same | Plastic enclosure, USB | Plastic enclosure, DB-style RS232 - same |
| Brand | LM Technologies | LM Technologies | LM Technologies | LM Technologies | LM Technologies | LM Technologies |
| Bluetooth Version | v2.0 / v2.1 + EDR | v2.0 / v2.1 + EDR | Bluetooth 3.0 | v2.0 / v2.1 + EDR | Bluetooth v2.0 / v2.1 + EDR | Bluetooth v2.0 / v2.1 + EDR |
| Class | Class 1 | Class 1 | Class 1 | Class 1 | Class 1 | Class 1 |
| Nominal Data Rate | 3 Mbps (EDR) | 3 Mbps | 3 Mbps | 3 Mbps | 3 Mbps | 3 Mbps |
| Power Supply (Pin 9) | 4 V to 13 V | 4 V to 13 V | 4 V to 12 V | 5 V to 9 V | USB-powered | 4 V to 13 V |
关键差异点
- World's smallest Bluetooth RS232 serial adapter (per manufacturer claim) （对比 LM048-3012)
- Patented firmware replicating DTR/DSR/RTS/CTS over the Bluetooth link （对比 LM058)
- Dual power input (RS232 Pin 9 or Mini-USB) （对比 LM048-3001)
设计说明
The LM048 accepts either RS232 Pin 9 (4 V to 13 V DC) or 5 V Mini-USB. When the host RS232 port cannot source adequate current on Pin 9 - common on USB-to-serial bridge boards - power the adapter from Mini-USB instead. Do not feed both power inputs simultaneously; the adapter will accept either, and dual-powering offers no benefit and risks back-feeding the host UART bridge.
A pair of LM048 adapters is required for transparent cable replacement - a single unit paired to a laptop does not perform the same role. Pair units with matching baud rate, parity, and flow-control settings; mismatched settings will silently drop data. Do not exceed the 460 kbps baud ceiling; legacy serial peripherals do not benefit from the radio's 3 Mbps nominal throughput.
The LM048's RS232 interface replicates DTR/DSR/RTS/CTS end-to-end, which is essential for legacy peripherals that use hardware flow control or DTR-toggle for wake-up. According to the LM Technologies datasheet, this replication is implemented in the adapter's patented firmware rather than at the radio layer, so pair both ends with identical serial parameters to keep the control signals aligned with the data stream.
Mount the LM048 with the onboard antenna oriented to maximize line-of-sight to its pair; the internal antenna is sensitive to orientation and nearby metal. Keep the adapter away from large metal enclosures, switching power supplies, and RS232 cable bundles that can detune the antenna and reduce the 100 m open-space range.
合规信息
Bluetooth SIG, CE, and FCC compliance marks are listed in the manufacturer datasheet. RoHS-compliant per LM Technologies product page. REACH, AEC-Q100, halogen-free, and conflict-mineral statements not explicitly published; treat as 'unknown' until confirmed by the manufacturer.