Specifications:
USB Operating voltage: 5V
USB Connector: USB-B
Protection: 200mA self-recovery fuse, isolated output
RS232 Connector: DB9 male
RS232 Protection: TVS diode, surge protection & ESD protection
RS232 Transmission mode: Point-to-point
RS232 Baud rate: 300bps ~ 921600bps
RS485/422 Connector: Screw terminal
RS485/422 Direction control: Hardware automatic control
RS485/422 Protection: 600W lightningproof and surge-suppress, 15KV ESD protection (reserved two 120R balancing resistors, enabled/disabled via jumper)
RS485/422 Transmission mode: Point-to-multipoints (485 mode: up to 32 nodes, it is recommended to use repeaters for 16 nodes or more, 422 mode: up to 256 nodes, it is recommended to use repeaters for 16 nodes or more)
RS485/422 Baud rate: 300bps ~ 2Mbps
TTL (UART) Operating voltage: 3.3V / 5V
TTL (UART) Connector: Screw terminal
TTL (UART) Pins: TXD, RXD, GND, 5V/3.3V
TTL (UART) Protection: clamp protection diode, over-voltage/negative-voltage proof, shock proof
TTL (UART) Transmission mode: Point-to-point
TTL (UART) Baud rate: 300bps ~ 2Mbps
PWR Red power indicator, light up when there is USB connection and voltage is detected
TXD: TX indicator, light up when the USB port sends data
RXD: RX indicator, light up when the device ports send data back

Package includes:
1* USB TO RS2321485/422/TTL Adapter
1* USB Cable
1* Buckle
1* Screwdriver