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8 Port RS-232 Serial Connector Box Hub for the PCI232INTE Intelligent Serial Card

Product ID: INTEBOX8

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  • Works in both 3.3 volt and 5 volt server slots
  • Compatible with all RS-232C interface devices

Designed for use with our PCI232INTE intelligent serial card, the INTEBOX8 lets you quickly add 8 RS-232 serial ports to your system. Up to 8 INTEBOX8s can be daisy-chained together to provide you with 64 high-speed ports. Perfect for industrial applications, this RS-232 connector box works with our intelligent serial card to improve your system performance.

Note: The INTEBOX8 requires a PCI232INTE.


  • Also used in environments using serial networking devices, high speed modems, monitoring equipment, long distance communication devices and printers
  • Ideal for commercial and industrial applications such as POS networks, ATMs, and bank teller stations
  • Remote serial device control
  • Factory/Office automation
  • Industrial process control

The Advantage

  • Provides up to 8 serial ports connections for’s Intelligent Serial Card
  • Easy to install and setup
  • 8 connector boxes can be daisy chained together and connected to a PCI23INTE using one 37-pin cable and offers up to 64 Serial Ports in a daisy chain configuration

Partner Numbers

  • UPC 065030804394


Warranty Information Warranty Lifetime
Connector(s) 1 - Connector Type(s) DB-37 (37 pin, D-Sub)
DB-37 (37 pin, D-Sub)
8 - External Ports DB-25 (25 pin, D-Sub)
Environmental Humidity 5~85% RH
Operating Temperature 0°C to 55°C (32°F to 131°F)
Storage Temperature 0°C to 65°C (32°F to 149°F)
Hardware Ports 8
Port Style External Hub
Industry Standards RS-232
Packaging Information Package Length 12.3 in [31.2 cm]
Package Width 2.3 in [58 mm]
Package Height 6.3 in [16 cm]
Shipping (Package) Weight 20.8 oz [590 g]
Performance FIFO 512 Bytes
Max Baud Rate 230.4 Kbps
Serial Protocol RS-232
General Specifications Power Consumption: 5V @ 300mA, +12V @ 100mA & -12V @ 100mA
Serial Interface: RS-232
Requirements:PCI232INTE PCI card
Flow Control: Xon/Xoff control or CTS/RTS control
OS compatibility: Windows 2000/NT/XP, Linux & Unix SCO Open Server
Expansion Capability: Up to 64 ports using 8 daisy-chained INTEBOX8 units.
Physical Characteristics Material Plastic
Product Length 8.3 in [21 cm]
Product Width 3.2 in [81 mm]



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Frequently Asked Questions


When you troubleshoot issues with a serial device, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:

  • Serial cables

  • Serial ports

  • Serial devices

To test your setup components, try the following:

  • Use the serial cable, serial port, and serial device in another setup to see if the problem is with the components or the setup.

  • Use a different serial cable, serial port, and serial device in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.

When you test your cables, it is recommended that you do the following:

  • Test each cable individually.

  • Use short cables when you are testing.

When you test the serial ports and serial device, it is recommended that you do the following:

  • Press the Windows key + R, type devmgmt.msc, and press Enter to open Device Manager. Check to see if your device is listed under Ports (COM & LPT).

  • Make sure 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.

Note: Some serial devices work only if the COM port number is between a certain range. For example, COM1 to COM4.

To check whether or not an RS-232 serial port is working, perform an RS-232 loopback test by doing the following:

  1. If your serial port is not female, convert it by taking a female/female cable or gender changer and plugging it into the serial port.
  2. Take a metal paperclip or wire and cross pins 2 and 3. If you look closely at the female end, the pins should be numbered.
  3. Open a telnet session on the COM port number of the device that you are testing. To find out the COM port number, refer to the following FAQ:

Note: To open a telnet session on the COM port, you need a telnet client like PuTTY or Hyper Terminal. Windows XP comes with Hyper Terminal.

  1. When the session is open, anything you type into it you should see. The loopback test fails when you cannot see what you are typing.

If the loopback test fails, make sure that the serial cable or gender changer that you are using works and that the adapter is in the correct port. 

You can check multiple ports at the same time by opening multiple sessions, putting the loopback adapter on one port, and trying to type into each session.  When you can see what you are typing, you know that the COM port is working and you can see which port number the physical serial port is. Close the window for the port that you just tested to speed up the testing of the remaining serial ports.

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Compliance and safety

Compliance letters

Safety Measures

  • If product has an exposed circuit board, do not touch the product under power.
  • If Class 1 Laser Product. Laser radiation is present when the system is open.
  • Wiring terminations should not be made with the product and/or electric lines under power.
  • Product installation and/or mounting should be completed by a certified professional as per the local safety and building code guidelines.
  • Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
*Product appearance and specifications are subject to change without notice.

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