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July 2025
778473-04
778473-04, 4-Port, USB to RS-232 Converter, USB-232/4 Serial Interface
Actual item may vary if no part number is provided on quote request.
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Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
Carol Zimme**** Verified Buyer
" Very responsive and helpful, competitive pricing. Good source! "
July 2025
Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
National Instruments 778473-04 Serial Interface Device
National Instruments part number 778473-04 is a 4 port Serial Interface Device, also known by the model name USB-232/4 This device is designed to integrate seamlessly with regular personal computers running Microsoft Windows. In the Windows environment, it functions like a standard hardware serial communication port. The front panel of the NI 778473-04 features LEDs that provide real-time status updates. Its sturdy casing allows it to withstand typical industrial environments where standard cable interfaces may not be durable. Known for its reliability and precision, this device can operate in either DCE or DTE mode as selected via software. Under normal operation, it draws approximately 300 mA from the host USB bus, with a peak of up to 500 mA at +5 VDC.
Being USB-powered, it does not require a separate power cable or jack. Moreover, the 4-ports of the 778473-04 offers software-selectable DTE or DCE transceiver modes, along with an automatic transceiver detection mode known as Auto232. The device also includes software-selectable biasing, allowing users to enable or disable biasing for each port through software controls. Development environments such as Visual Basic, Visual C++, and Excel, as well as National Instruments LabVIEW, LabWindows/CVI, and Measurement Studio, support access to these serial ports using standard serial I/O functions. It is built to convert a standard USB port into four standard serial ports.
The 778473-04 features a USB 2.0 B-type plug connector and provides access to the four serial ports via individual DB-9 male connectors. This serial Interface Device is bus-powered, meaning it draws power directly from the USB serial bus and does not require an additional power supply. It is compatible with a wide range of computer programs and applications that utilize standard COM ports.
| Model | 778473-04 |
|---|---|
| Model Name | USB-232/4 |
| Part Type | Serial Interface Device |
| Ports | 4 |
| Supported Serial Protocol | RS-232 |
| Bus Connector | USB 2.0 |
| FIFO Size | 128 B |
| Maximum Transfer Rate | 460.8 kb/s (RS-485); 230.4 kb/s (RS-232) |
| Serial Connectors | DB-9 |
| Power Requirements | 5 VDC, 300 mA typical, 500 mA maximum |
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778473-04 PDF Manuals
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