PRODUCTS > USB to RS-232 > DIN rail > USB2-4COM-SI-M


Products Manual
  • USB2-4COM-SI-M
  • USB2-4COM-SI-M
  • USB2-4COM-SI-M
  • USB2-4COM-SI-M
USB2-4COM-SI-M - 4-Port RS-232 USB-to-Serial Adapter, with Optical-isolation and Surge Protection, Metal Case


  • Adds four industrial RS-232 serial ports with optical isolation by connecting to a USB port

  • 2000V DC optical isolation

  • 25KV ESD surge protection

  • Installed as standard Windows COM port

  • SECC metal chassis with DIN rail bracket

  • Full RS-232 modem control signals and hardware/software flow control

  • RS-232 data signals: TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI, GND

  • High speed serial port with the baud rate up to 921.6K bps

  • 128 byte transmit FIFO & 384 byte receive FIFO

  • Non-standard baudrates supported

  • LEDs of Power, TxD and RxD for easy port monitoring and diagnostics

  • Serial port protected with surge protection of 25KV

  • Terminal power adapter of 5V, 2A provided

  • Easy plug and play installation and RS-232 device connection

  • COM port number assigned can be changed to any COM port number required

  • Works with USB 1.1 & 2.0 host port

  • Supports Windows 8, Windows 7, Vista, 2003, XP, 2000 and Linux

  • Supports Mac OS X 10.9 and above, This driver is signed by Apple


Compliance USB 1.1/2.0 compatible
Speed 480 Mbps, hi-speed USB
FIFO 128 byte transmit FIFO
384 receive FIFO
Serial Interface
Port Type RS-232
Number of Ports 4
Connectors DB9 male
Serial Line Protection
ESD Protection 25KV
Optical Isolation 2000V DC
Serial Port Speed
Baudrate 300 bps to 921.6k bps
Serial Communication Parameters
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
Flow Control RTS/CTS, XON/XOFF
Serial Signals
Driver Support
OS Windows 7, Vista, 2003, XP (WHQL certified) and 2000
Linux Kernel and up built-in support
Power Supply
Input Self-powered
Power adapter of 5VDC, 2A
Chassis SECC metal chassis with DIN rail bracket
Operating Temperature 0 to 55 °C (32 to 131 °F)
Operating Humidity 5 to 95% RH
Storage Temperature -20 to 75 °C (-4 to 167 °F)
Safety Approvals CE, FCC

RS-232 DB9 Male

RS-232 DB9 Male Connector Pin-outs

RS-232 Signal Pin-outs of DB-9 Male

  Pin Signal  
  1 DCD  
  2 RxD  
  3 TxD  
  4 DTR  
  5 GND  
  6 DSR  
  7 RTS  
  8 CTS  
  9 RI