사양
This is a miniature isolated RS485 bus transceiver module integrating isolated power, signal isolation and bus transceiver circuit all in one, directly converting MCU TTL level signals into differential RS485 bus signals to achieve electrical isolation between control end and field bus lines.
Part Number Definition
RSM represents the compact isolated RS485 module product line. 485 refers to compliance with standard RS485 half-duplex communication protocol. M stands for miniaturized integrated isolation structure with built-in isolated power supply inside the module.
Core Electrical Performance Parameters
Input working voltage supports 3.3V and 5V two common mainstream power supply options, directly docking most single-chip microcomputer and embedded main control circuits. Communication baud rate ranges from 1200bps up to 500kbps, complying with TIA/EIA-485-A industry specification. The isolation voltage between signal side and bus side reaches 2500VDC, effectively eliminating ground potential difference interference and greatly improving anti-interference performance in industrial field wiring environments. Up to 32 bus nodes can be connected on a single RS485 trunk line. The module integrates bus short-circuit protection, overvoltage protection and multi-level ESD surge protection. When abnormal bus voltage or short circuit occurs, it will automatically limit current to avoid burning out the main control circuit. Static power consumption is low, suitable for battery-powered low-power terminal devices.
Packaging and Assembly Specifications
Standard DIP8 through-hole packaging is used with small overall size to save PCB layout space. The shell uses flame retardant insulating material. It is a moisture sensitive component, and reflow soldering needs to be completed within 168 hours after opening the original vacuum package. Tube packaging is provided to match automatic plug-in production assembly.
Environmental and Compliance Standards
Operating temperature range is -40℃ to +85℃, adapting to cabinet equipment, outdoor monitoring and vehicle-mounted equipment with severe temperature changes. The product adopts lead-free production technology and meets RoHS environmental control requirements. Compared with the scheme of separate isolation power plus discrete transceiver chip, it reduces the number of peripheral devices and simplifies circuit design.
일반적인 애플리케이션 분야
Industrial on-site sensor signal acquisition and PLC remote IO communication circuit Smart meter, power distribution monitoring terminal and power equipment wired data transmission Access control system, elevator auxiliary control unit and building automation equipment bus communication Environmental monitoring instruments, water quality detection equipment and outdoor unattended collection nodes Engineering machinery control panel, vehicle equipment signal interaction and serial port bus extension module
LXB Semicon supplies original RSM485M isolated RS485 transceiver module
