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NI (National Instruments) USB-232/4 4-Port, USB, RS232 Serial Interface Device
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NI (National Instruments) · USB 2.0

USB-232/4

The NI USB-232/4 is a four-port USB-to-RS-232 serial interface device. It provides four serial channels through a USB 2.0 connection, with D-SUB connections and no isolation.

ManufacturerNI (National Instruments)
ModelUSB-232/4
Part Number778473-04
Product Type4-Port, USB, RS232 Serial Interface Device
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Free Shippingfull policy linked
30-Day Warrantystandard coverage
30-Day Returnspolicy applies
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Bus ConnectionUSB 2.0
Isolation TypeNone
Number of Serial Channels4
Supported Serial ProtocolsRS232
Front Connection TypeD-SUB
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Overview

Product overview

Key product information and technical features.

The USB-232/4 converts a USB connection into four asynchronous RS-232 serial ports for communication with serial devices. It appears as standard COM ports for serial communications.

The interface uses USB 2.0 and D-SUB front connections, and includes RTS/CTS hardware handshake lines. This model does not provide isolation. Its listed NI part number is 778473-04.

  • Four RS-232 serial channels in one USB-connected interface.
  • USB 2.0 bus connection.
  • D-SUB front connections for serial cabling.
  • Standard COM-port operation for serial communications.
  • RTS/CTS hardware handshake lines.
Verified specifications

Technical data

Verified product specifications.

Bus ConnectionUSB 2.0
Isolation TypeNone
Number of Serial Channels4
Supported Serial ProtocolsRS232
Front Connection TypeD-SUB
NI part numbers778473-04
Condition & included items

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NI

Manufacturer

USB 2.0

Bus Connection

USB-232/4

This product

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Manuals & software

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Getting Started (NI)Getting Started · ni.com
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Specifications (NI)Specifications · ni.com
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Dimensional Drawings (NI)Dimensional Drawings · ni.com
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Product Page (NI)Product Page · ni.com
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Shipping, warranty & returns

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Warranty
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Returns
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FAQ

Product-specific questions

Product-specific answers based on available technical information.

What is the NI USB-232/4?

It is a four-port USB-to-RS-232 serial interface device, listed under NI part number 778473-04.

How does the USB-232/4 connect to a computer?

It uses a USB 2.0 bus connection and presents its serial channels as standard COM ports.

Which serial protocol and connectors does it use?

The USB-232/4 supports RS-232 and has D-SUB front connections.

Does the USB-232/4 provide isolation?

No. The listed isolation type for this model is None.

Does it support hardware handshaking?

Yes. The interface includes RTS/CTS hardware handshake lines.

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