4 Port USB to Quad RS-422 485 Optically Isolated Adapter

USB to Serial Adapter for RS422 and RS485 Applications

The USB-4COMi-SI-M is a USB to Quad RS-422 485 Optical isolated serial adapter and is designed for commercial and industrial communication applications where Optical Isolation is a must have. The USB-4COMi-SI-M Serial Adapter instantly adds four RS-422, or RS-485 serial communication ports to your system while offering optical isolation and surge protection.

  • Optically Isolates your RS-422 and RS-485 serial ports.
  • Incorporates DIP Switch control for independent control of serial signal to the port.
  • Has built-in surge and ESD protection of up to 25KV when abnormal electrical occurrences occur.
  • Self-powered, one switching power adapter of 5V, 2A provided.

$384.95

In stock

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Units Price
1 - 4 $384.95
5 - 11 $373.40
12 - 24 $365.70
25 - 49 $358.00
50+ $346.46

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Model No. USB-4COMi-SI-M

Description

The USB-4COMi-SI-M is a USB to Quad RS-422 485 Optical isolated serial adapter and is designed for commercial and industrial communication applications where Optical Isolation is a must have. Serial RS-422 or RS-485 port expansion is made simple with the USB-4COMi-SI-M by connecting to a host USB port on your computer or USB hub for Plug-and-Play installation and automatic serial device detection.

Serial Cable Connections of the 4 Port USB to Quad Rs-422 Adapter

The USB to Quad RS-422 485 does not require additional IRQ or DMA configuration so it does not use memory as a resource on the system, therefore there are no conflicts. The adapter is self-powered, and one power supply adapter of 6V/2.1 Amp is included.

The adapter is designed with a four external 4-pin dip switches (pictured below) to set RS-422 or RS-485 mode conveniently, without the need to open the metal chassis. Each port can be independently set to RS-422 or to RS-485, depending on your requirement in application.

DIP Switches for 4 Port USB to Quad Rs-422 Adapter

The USB-4COMi-SI-M USB to Quad RS-422 adapter has a built-in surge protector to withstand electrostatic discharges and power surges up to 25KV ESD. The USB to RS-422/485 Adapter provides instant connectivity to RS-422 or RS-485 communication devices for POS, factory automation equipment, multi-drop data collection devices, bar code readers, time clocks,  scales, data entry terminals, PC to PC long distance communications, ATMs and serial data communication in harsh environments. The adapter’s USB to Industrial I/O provides industrial solution requiring single node or multi-drop communications over short and long distance.

 

Additional Features:

  • Adds four RS-422 or RS-485 serial ports by connecting to a USB port
  • 2000V DC optical isolation
  • 25KV ESD surge protection
  • No need to open chassis to set operation modes- four external DIP switches for easy RS-422, RS-485 mode settings
  • Installed as standard Windows COM port
  • SECC metal chassis with DIN rail bracket
  • 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
  • Self-powered. One switching power adapter of 5V, 2A provided
  • Easy plug and play installation and 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
  • Item Dimensions: 6.57(W) x 3.897(L) x 1.14in(H)

OS Support:

  • Windows 10, 8, 7, Vista, XP, 2003, 2000, ME and 98
  • Linux and Mac OS 10.X

Package Contents

  • 4 port USB to RS422/485 isolated serial adapter
  • Din Rail mounting plates and screws
  • USB A to B Cable

*Surface Mounting screws not included.

Specifications

Product Specifications

Power
Input Voltage

+5V DC

Compliance
Country of Origin

Taiwan

Certifications

,

Compliance

RoHS, TAA

Mechanical
Color

White

Mounting Style

Din-Rail (Optional Bracket)

Ports

4 Serial Ports

USB
Isolated/Surge Protected

Yes

Screw Lock Compatible

Yes

Serial Attributes
Serial Standards

RS422, RS485

Serial Ports

4

Software
OS Support

Linux, Mac OSX, Win 10, Win 7, Win 8, Win Vista, Win XP

Environmental
Operating Temperature

0C to 55C

Hardware
Chipset

FTDI

Performance
Isolated/Surge Protected

Yes

Other Data
Connector

DB9 Male w/ Nuts

Chip Model

FT4232HL, MAX3089E

Warranty

1 year from date of purchase

Weight

2 lbs

Dimensions

12.75 × 6 × 2.75 in

UPC: 729440690922
Technical

Technical Specifications:

USB Bus
Compliance USB 1.0/1.1 compliant, USB 2.0 compatible
Speed 12 Mbps, full-speed USB
FIFO 128 byte transmit FIFO
384 receive FIFO
Serial Interface
Port Type RS-422/RS-485
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
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 2.4 and up built-in support
Power Supply
Input Self-powered
Power adapter of 5VDC, 2A
Mechanical
Chassis SECC metal chassis with DIN rail bracket
Environmental
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 EN55022 Class B, EN55024, EN61000-3-2, EN61000-3
IEC 61000-4-2, IEC 61000-4-3, IEC 61000-4-4, IEC 61000-4-5,
IEC 61000-4-6, IEC 61000-4-8, IEC 61000-4-11.
CISPR PUB. 22 and FCC Part 15 Class B.

 

RS-422 & RS-485 DB9 Male Connector Pin-outs

RS-422 and RS-485 DB9 Male Connector Pin-outs
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 Connector

  Pin Signal  
  1 TxD- (A)  
  2 TxD+(B)  
  3 RxD+(B)  
  4 RxD- (A)  
  5 GND  
 

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

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

RS-422 Signal Wiring

    Point-to-Point 4 Wire Full Duplex

USB-4COMi-SI-M                                    RS-422 Device
RS-422 Signal Wiring Point-to-Point 4 Wire Full Duplex

    RS-422 with Handshaking

USB-4COMi-SI-M                                   RS-422 Device
RS-422 Signal Wiring RS-422 with Handshaking

RS-485 Signal Wiring

    Point-to-Point 4-Wire Full Duplex

USB-4COMi-SI-M                               RS-485 Device
RS-485 Signal Wiring Point-to-Point 4-Wire Full Duplex

    Multidrop RS-485 2-Wire Half-duplex

USB-4COMi-SI-M                               RS-485 Device
RS-485 Signal Wiring Multidrop RS-485 2-Wire Half-duplex
Optional Accessories

Optional Accessories

The 4 port USB to RS422/485 isolated serial adapter has certain accessories that work with it. These accessories are what you can order if needed.

USB 2.0 Cable for close connections Use this USB 2.0 cable to connect your desktop or laptop using a USB hub, printer, or scanner. Transfer…

Model# USB2-AB

$2.95$10.95

In stock

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Serial F.A.Q.

Product F.A.Q.

View frequently asked product questions below. For all serial troubleshooting, visit this page.
Still need help? Reach out!

  • How do I clean and reinstall my FTDI drivers?
      1. Download the CDM Uninstaller HERE.
      2. Extract the zip file, or open the “CDMuninstallerGUI.exe” utility.
      3. Leave the ‘Vendor ID’ set to 0403 and ‘Product ID’ set to 6001.
      4. Click Add.
      5. Click Remove Devices.
      6. Download the corresponding driver for your operating system and follow on-screen prompts. Windows Driver | MacOS Driver

    Video tutorial here.

  • How can I change my device’s COM port?
      1. Click on Start and navigate to the Control Panel
      2. Locate and click on Device Manager
      3. Under “Ports (COM & LPT)” you will find your serial device titled “USB Serial Port” along with its current COM Port.
      4. Right click on “USB Serial Port” and click on Properties.
      5. Navigate to the “Port Settings” tab and click on “Advanced…”
      6. Once there, the “COM Port Number:” can be changed with a dropdown menu to select the port number.
      7. Click your desired port number (i.e. COM2) and click “OK”.
      8. Click “OK” once more.
      9. Your serial device is now assigned to your chosen COM Port.

     

  • How do I check to ensure the COM port is listed properly in Windows?
    To ensure your serial device is installed properly, complete the following:

    1. Press Windows Key + R to open the Device Manager. Once Run comes up, type “devmgmt.msc” into the text field and press Enter.
    2. Expand the section labeled, Ports (COM & LPT).
    3. You should now see a COM number in brackets to the right of each port. If the device is installed properly, no exclamation points or question marks should be present next to the device.
  • I have everything hooked up, but nothing is functioning correctly.
    To rule out potential issues, quickly test your individual components to ensure that they are working correctly individually, and are not the source of the problem:

    • Serial cables
    • Serial ports
    • Serial devices

    Test your components by:

    • Hook up the serial cable(s), serial port(s), and serial device(s) in a different setup to see if the issue stems from a particular component, or the setup as a whole.
    • Replace the serial cable, port, or device within your setup to further troubleshoot the issue’s origin.

    When testing cables:

    • Test each cable individually.
    • Use short cables when you are testing.

    When testing serial ports and devices:

    • Press the Windows key + R, in Run, type devmgmt.msc, and press Enter to open the Device Manager. You can then check to see if your device is listed under Ports (COM & LPT).
    • Ensure that the COM port number is the correct number for the serial device and that the software being used to connect the computer to the serial device uses the correct COM port number.
    • If the device is listed with an error, follow the instructions on the website to reinstall the drivers.
  • Serial communication is not functioning correctly, how can I tell if the problem caused by the adapter or my serial software application?
    Older serial communication applications make use of legacy hardware addresses, often incompatible with PCI, PCIe, and USB to Serial products. Contact the software provider to troubleshoot.
  • I am receiving an error when I try to install the drivers in Windows 8 64 bit.
    Driver Signature Enforcement in Windows 8 may need to be disabled in order to use various drivers. After disabling this feature, the driver will be allowed to install.

    Note: You are required to restart your computer after disabling the Driver Signature Enforcement. Save all open work on your computer.

    Disable driver signature enforcement:

    1. Press the Windows key + C.
    2. Click Settings > Change PC Settings.
    3. In the left pane, click General.
    4. In the right pane, under Advanced startup, click Restart now.

    When your system restarts:

    1. Click Troubleshoot > Advanced options > Startup Settings > Restart.
    2. Press 7.

    When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.

  • I am receiving an error when I try to install the drivers in Windows 10 64 bit.
    Driver Signature Enforcement in Windows 10 may need to be disabled in order to use various drivers. After disabling this feature, the driver will be allowed to install.

    Note: You are required to restart your computer after disabling the Driver Signature Enforcement. Save all open work on your computer.

    Disable Driver Signature Enforcement:

    1. Click the Windows icon in the taskbar.
    2. Click Power.
    3. Press and hold the Shift key and click Restart.

    After your computer restarts:

    1. Click Troubleshoot Advanced Options Startup Settings Restart.
    2. Press 7.

    When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.

  • Why did the software not install properly in macOS High Sierra (10.13) or later?
    High Sierra 10.13 and later versions of macOS enforce strict security policy revisions. In order for the device to operate, software packages like those used in this installation must be allowed in macOS Security and Privacy settings once the software is installed.

    Once the driver/software is installed, follow these steps to allow the software:

    1. Open System Preferences.
    2. Open Security & Privacy.
    3. Click the Allow button near the bottom of the General tab.
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