Hi-Speed 8-Port USB to Serial Adapter (Terminal Block, RS-232/422/485), DIN-rail & Wall Mountable Metal Case, 15KV ESD Protection

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TITAN’s USB2-4COMi-TB, USB2-4COMi-SI-TB, USB2-8COMi-TB, and USB2-8COMi-SI-TB USB2.0 to Quad/Octal industrial serial adapters are designed to make serial RS-422 and RS-485 port expansion quick and simple. Connecting to a USB port on your computer or USB hub, the USB to industrial serial adapter instantly adds four or eight RS-232/422/485 multi-electrical interface serial communication ports to your system. By taking advantage of the plug-and-play and hot-plug features of the USB bus, this industrial serial adapter makes it easier than ever to add four/eight industrial communication ports to your system.

Plugging the USB quad/octal industrial serial adapters to the USB port, the adapters are automatically detected and installed. There are no IRQ & COM port conflicts, since the port doesn’t require any additional IRQ, DMA, memory as resources on the system. The RS-232 or RS-422/485 port functions as native Windows COM port, and it is compatible with Windows serial communication applications. Each port is individually configurable. The adapters are designed with external switches to set RS-232, RS-422 or RS-485 ports and different operation modes conveniently.

The isolation and surge protection models (USB2-4COMi-SI-TB, USB2-8COMi-SI-TB) support 3000V DC optical isolation, 15kV ESD protection and 600W surge protection for all serial signals.


  • Supports USB1.1 and USB2.0 transfer speeds from 1.5Mbps up to 480Mbps, automatic link and speed detection
  • Adds eight high speed RS-232/422/485 serial ports via USB connection
  • 2k bytes receive and transmit buffer for high speed data throughput
  • Requires no IRQ, DMA, I/O port
  • RS-232 max bitrates up to 1Mbps
  • RS-422/485 max bitrates up to 12Mbps
  • Each serial port supports 5-pin screw-lock-type terminal block connector
  • Auto transmit buffer control for 2-wire RS-485 half-duplex operation
  • Biasing and termination resistors installed on-board
  • Supported RS-232 3-wire signals: RxD, TxD, GND
  • Supported RS-422, RS-485 4-wire signals: TxD-, TxD+, RxD+, RxD-
  • Supported RS-485 2-wire signals: Data-, Data+
  • Monitor LEDs of TxD, RxD indicating port status
  • AC to DC 12V, 1A switching power supply included
  • Virtual COM port drivers available for Windows 10, 8.1, 8, 7, Vista, 2003, XP, 2000
  • Industrial-grade metal case with DIN rail ears for DIN rail mounting


ComplianceUSB 2.0 High Speed, USB 1.1 compliant
Speed480Mbps, hi-speed USB
ConnectorUSB type B
FIFO2k bytes transmit and receive
Operating SystemsWindows 2000 up to Windows 10
Windows Server 2000 up to 2018
Linux kernel 2.6+
Mac OS X support available
InstallationThe driver is already installed (Linux), or automatically downloading and installing device drivers after Device connection (Windows).
Serial Interface
Number of Ports8
Connector5-pin terminal block
Max. SpeedRS-232:up to 1Mbps RS-422/485:up to 12Mbps
RS-232 SignalsTxD, RxD, GND
RS-422 SignalsTxD-, TxD+, RxD+, RxD-
RS-485 Signals (4 wire)TxD-, TxD+, RxD+, RxD-, GND
RS-485 Signals (2 wire)Data-, Data+, GND
Protection15kV ESD protection for all signals
Serial Communication Parameters
Data Bits7, 8
ParityNone, Even, Odd, Mark, Space
Stop Bit1, 2
Flow ControlHardware (RTS, CTS), XON/XOFF
Power InputDC 12V, 1A external power adapter
Power OutputSupply DC +5V 500mA power to each connected devices
CasingSECC metal chassis with DIN rail bracket
Operating Temperature0°C to 60°C (32°F to 140°F)
Storage Temperature-40°C to 85°C (-40°F to 185°F)
Operating Humidity0% to 80% RH
Safety ApprovalsCE, FCC


Product Manual


Driver Installation

You need to install driver first, prior to hardware installation. Do not connect the USB-to-Serial Adapter to the USB port of your computer, before you finish driver installation. 

Uninstalling Drivers

Uninstallation Guide For Windows 2000

Uninstallation Guide For Windows 10, 8.1, 8, 7, Vista, XP, Server 2016, Server 2008, Server 2003