6 in 1 USB Serial Converter TTL/485/232

This DFRobot converter plugs directly into a USB port and handles six connections: USB to TTL, USB to RS232, USB to RS485, TTL to RS232, TTL to RS485 and RS232 to RS485. The operating mode is selected with a 2-way DIP switch and a slide switch. The board uses a CP2102 for USB plus an SP3485 for RS485 and an SP3232 for RS232 (printing).

All signals are on pin headers, including RS232 (232T, 232R); there is no D-sub socket. A 500 mA fuse protects against short circuit and overcurrent.

Features:

Six operating modes, selectable with DIP and slide switch
Inputs and outputs for 3.3 V and 5 V according to DFRobot
Baud rate up to 2 Mbit/s
500 mA fuse against short circuit and overcurrent
LEDs: USB yellow, RX red, TX green
DIP switch rated for 100,000 operations according to DFRobot

Application Examples:

Programming and debugging microcontrollers via TTL UART
Addressing RS485 and RS232 devices from a computer
Converting between RS232 and RS485 without a computer

Documentation:

DFRobot FIT0781 product page

Technical Data:

Manufacturer: DFRobot
Manufacturer SKU: FIT0781
Chips: CP2102 (USB), SP3485 (RS485), SP3232 (RS232) (printing)
Levels: 3.3 V and 5 V
Baud rate: up to 2 Mbit/s
Top pin header: DTR, +5V, 3V3, TXD, RXD, GND
Bottom pin header: RTS, A, B, 232T, 232R, GND
Switch positions per mode (DIP 1, DIP 2, slide switch) according to DFRobot:
USB to TTL: ON, OFF, 232-485
USB to RS232: ON, OFF, 232-TTL
USB to RS485: ON, ON, 232-485
TTL to RS232: OFF, OFF, 232-485
TTL to RS485: OFF, ON, 232-485
RS232 to RS485: OFF, ON, 232-485
Protection: 500 mA fuse
Operating systems according to DFRobot: Windows (8, 7, XP, 2000, CE), Linux, macOS
Board dimensions: 31 × 18 × 7 mm
Weight: 16.3 g