Overview USB TO RS232/485 is a USB to RS232/485 non-isolated serial port converter, featuring the original FT232RNL for improved stability and compatibility. It comes with a built-in self-recovering fuse, TVS protection circuit, etc. USB TO RS232/485 offers simple operation, zero-delay automatic transmission and reception conversion, and boasts characteristics such as fast, stable, reliable, and safe communication. Features Onboard Original FT232RNL chip. Fast communication, stable and reliable, better compatibility. Onboard TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic. Onboard resettable fuse and protection diodes, ensure the current/voltage stable outputs, provide over-current/over-voltage proof, and improve shockproof performance. Onboard RS232/485 communication switching circuit, configured by switch. Integrates optional RS485 output terminal 120R resistor, enabled/disabled via a switch. 3x LEDs for indicating the power and transceiver status. ABS case design, small in size, easy to use, portable and cost-effective Parameters Model USB to RS232/RS485 Host Interface USB Device Interface RS232/RS485 USB Interface Operating Level 5V Interface Type-A male Protection 200mA self-recovery fuse Transmission Distance About 5m RS232 Interface Interface Screw Terminal Transmission Distance About 15m Transmission Mode Point to Point Baud Rate 300 bps ~ 921600bps RS485 Interface Interface Screw Terminal Direction Control Hardware automatic control Protection Provide TVS diode protection, anti-surge, and ESD protection (onboard 120R resistor) Transmission Distance About 1200m (at low rate) Transmission Mode Point to multi-point (up to 32 nodes, add the relay for up to 16 nodes) Baudrate 300 bps ~ 2Mbps Indicator PWR Red power indicator, connect to USB, light on when the voltage is detected TXD Transmitting indicator, green light is on when data is sent from the USB interface RXD Receiving indicator, blue light is on when the data is sent back from the device interface Usage Environment Temperature Range -15 ~ 70 Humidity Range 5% ~ 95%RH OS Mac, Linux, Android, Windows 11 / 10 / 8.1 / 8 / 7 Onboard Interface Driver Installation USB Driver Installation Download the driver file VCP Driver Double click on CDM212364_Setup.exe and install it. Click on Extract , and then "NEXT". Click on I accept this agreement , and then click on "NEXT", and click on "Finish". After connecting the PC, you can see the usable COM port number in the device manager. Hardware Test Test environment: PC (Windows) Required accessories: USB TO RS232/485 x 2pcs USB-A male-to-female cable x 1 Wires RS232 Test Connect the RS232 interface of the USB TO RS232/485 module to the RS232 interface, that is, RXD and TXD are connected in a staggered manner, GND and GND are connected, and the toggle switch on top of the module is switched to RS232, and the connection diagram is referenced as follows: Open two SSCOM and the corresponding COM port numbers. Select the baud rate as 115200 , input the characters to be sent, select Add time stamp and package , and click on Open COM : Set the two SSCOM windows sending at 100ms intervals, and then you can see the effect as shown below: RS485 Test Connect the RS485 connector of the USB TO RS232/485 module, that is, A+ --> A+, B- --> B-, GND --> GND, and switch the toggle switch above it to RS485, the connection diagram is referenced below: Open two SSCOM windows on the PC and the corresponding COM ports: