USB-COMi-SI

1-Port USB to Serial Adapter (RS-422/485), 25kV ESD & 2kV Optical Isolation Protection

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Description

The USB-COMi and USB-COMi-SI Industrial Single RS-422/485 Adapters are designed to make serial port expansion quick and simple. Connecting to a USB port on your computer or USB hub, the USB Serial Adapter instantly adds one industrial RS-422/485 multi-electrical interface serial communication port to your system. By taking advantage of the USB bus, the USB Serial Adapter makes it easier than ever to add one RS-422/485 port and serial devices to your system with easy plug and play and hot plug features. Adapting the new technology, the serial port expansion now takes the new bus with easy and convenient connectivity.

Plugging the USB-COMi or USB-COMi-SI USB to Industrial Single Serial Adapter to the USB port, the adapter is 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-422/485 port functions as native Windows COM port, and it is compatible with Windows serial communication applications. The adapter is designed with external switches to set RS-422 or RS-485 ports and different operation modes conveniently.

The USB Serial Adapter provides instant connectivity to RS-422/485 communication devices for factory automation equipment, multi-drop data collection devices, barcode readers, time clocks, scales, data entry terminals, ATMs and serial communication in harsh environment. The USB to Serial Adapter is suitable for remote access, retail and industrial application, data collection and other applications requiring high speed RS-422/485 communication ports.

Features


  • Adds a full speed RS-422/485 serial port by connecting to a USB port
  • 2000V DC optical isolation for all signals
  • Robust and compact plastic housing
  • Powered by USB port, no external power adapter required
  • LEDs indicate TxD and RxD for easy port monitoring and diagnosis
  • Installs as a standard Windows COM port
  • Automatic transmit and receive control for 2-wire RS-485 half-duplex mode
  • Built-in termination and biasing
  • Serial port protected with surge protection of 25kV
  • Non-standard baudrates supported
  • Easy plug and play installation and RS-422/485 device connection
  • High speed serial port with baud rate up to 10Mbps
  • Supports Windows 11, 10, 8.1, 8, 7, XP, Windows Server 2025, 2022, 2019, 2016, 2012 R2, 2012 and 2008 R2
  • Supports Linux Kernel version 3.0 and later
  • Supports Apple-provided VCP on OS X 10.9 and later

Specifications

USB Bus
InterfaceUSB 2.0 Full Speed, USB 1.1 compliant
Speed12Mbps, full-speed USB
USB ConnectorUSB type B
Serial Interface
InterfaceRS-422/485
Number of Ports1
ConnectorDB9 male
Max. SpeedRS-422/485:up to 10Mbps
RS-422 SignalsTxD-, TxD+, RxD+, RxD-, GND, RTS-, RTS+, CTS+, CTS-
RS-485 Signals (4 wire)TxD-, TxD+, RxD+, RxD-, GND
RS-485 Signals (2 wire)Data-, Data+, GND
FIFO256 bytes transmit 128 bytes receive
Protection25kV ESD protection for all signals
2000V DC optical isolation for all signals
Serial Communication Parameters
Data Bits7, 8
ParityNone, Even, Odd, Mark, Space
Stop Bit1, 2
Flow ControlHardware (RTS, CTS), XON/XOFF
Drivers Support
WindowsWindows 11, 10, 8.1, 8, 7, XP
Windows Server 2025, 2022, 2019, 2016, 2012 R2, 2012 and 2008 R2
LinuxLinux Kernel version 3.0 and later
MacApple-provided VCP on OS X 10.9 and later
Power
Power InputPower supplied via USB (5V) connector
No external power needed
Mechanical
CasingPlastic, ABS
Environmental
Operating Temperature0°C to 55°C (32°F to 131°F)
Storage Temperature-20°C to 75°C (-4°F to 167°F)
Operating Humidity5% to 95% RH
Safety ApprovalsCE, FCC

Document


Product Manual

Software


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

Pinout

RS-422 DB9 Male Connector Pinout

PINSIGNAL
1TxD- (A)
2TxD+ (B)
3RxD+ (B)
4RxD- (A)
5GND
6RTS- (A)
7RTS+ (B)
8CTS+ (B)
9CTS- (A)
WordPress Table

RS-485 4-Wire (Full duplex) DB9 Male Connector Pinout

PINSIGNAL
1TxD- (A)
2TxD+ (B)
3RxD+ (B)
4RxD- (A)
5GND
WordPress Table

RS-485 2-Wire (Half duplex) DB9 Male Connector Pinout

PINSIGNAL
1Data- (A)
2Data+ (B)
5GND
WordPress Table