PRODUCTS > USB to RS-232/422/485 > Rack-mountable > USB-16COMi-RM


Products Manual
  • USB-16COMi-RM
  • USB-16COMi-RM
  • USB-16COMi-RM
  • USB-16COMi-RM
USB-16COMi-RM - 16-Port RS-232/422/485 USB-to-Serial Adapter, Metal Case, DIN rail, Rack-Mountable


  • Adds sixteen RS-232, RS-422 or RS-485 serial ports by connecting to a USB port

  • No need to open chassis to set operation modes-sixteen external DIP switches for easy RS-232, RS-422, RS-485 mode settings

  • Installed as standard Windows COM port

  • SECC metal chassis with both DIN rail brackets and rack-mounting kits for flexible mounting

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

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

  • RS-422 data signals: TxD-, TxD+, RxD+, RxD-, GND, RTS-, RTS+, CTS+, CTS-

  • RS-485 4-wire data signals: TxD-, TxD+, RxD+, RxD-

  • RS-485 2-wire data signals: Data-, Data+

  • Automatic transmit and receive control for 2-wire RS-485 half-duplex mode

  • Built-in termination and biasing

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

  • Non-standard baudrates supported

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

  • Serial port protected with surge protection of 10KV

  • Built-in switching power supply of 100V~240V

  • Easy plug and play installation and RS-232/RS-422/RS-485 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

  • Standard 19-inch, 1U rackmount chassis


Compliance USB 1.1/2.0 compliant
Speed 480 Mbps, hi-speed USB
FIFO 128 byte transmit FIFO
384 receive FIFO
Serial Interface
Port Type RS-232/RS-422/RS-485 selectable
Number of Ports 16
Connectors DB9 male
Serial Line Protection
ESD Protection 10KV
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
RS-422 TxD-(A), TxD+(B), RxD+(B), RxD-(A), GND, RTS-(A), RTS+(B), CTS+(B), CTS-(A)
RS-485-4 wire TxD-(A), TxD+(B), RxD+(B), RxD-(A), GND
RS-485-2 wire Data-(A), Data+(B), GND
Driver Support
OS Windows 7, Vista, 2003, XP (WHQL certified) and 2000
Linux Kernel and up built-in support
Power Supply
Input Self-powered
Built-in AC to DC switching power supply with wide
Range of AC input from 100VAC to 240VAC
Chassis SECC metal chassis with DIN rail bracket
Rack-mounting brackets included
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 & RS-422 & RS-485 DB9 Male Connector Pin-outs
RS-232 DB9 Male

    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  
RS-422 DB9 Male

    RS-422 Signal Pin-outs of DB-9 Male

  Pin Signal  
  1 TxD- (A)  
  2 TxD+(B)  
  3 RxD+(B)  
  4 RxD- (A)  
  5 GND  
  6 RTS- (A)  
  7 RTS+(B)  
  8 CTS+(B)  
  9 CTS- (A)  
RS-485 DB9 Male

    RS-485 4-Wire (Full duplex) Signal Pin-outs of DB-9 Male

  Pin Signal  
  1 Tx- (A)  
  2 Tx+(B)  
  3 Rx+(B)  
  4 Rx- (A)  
  5 GND  

    RS-485 2-Wire (Half duplex) Signal Pin-outs of DB-9 Male

  Pin Signal  
  1 Data- (A)  
  2 Data+(B)  
  5 GND   

RS-422 Signal Wiring

    Point-to-Point 4 Wire Full Duplex

USB-16COMi-RM                                    RS-422 Device

    RS-422 with Handshaking

USB-16COMi-RM                                   RS-422 Device

RS-485 Signal Wiring

    Point-to-Point 4-Wire Full Duplex

USB-16COMi-RM                               RS-485 Device

    Multidrop RS-485 2-Wire Half-duplex

USB-16COMi-RM                               RS-485 Device