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July 2025
USB-485-4
USB-485/4, 4-Port, RS-485/RS-422 Serial Interface Device
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 USB-485/4 Serial Interface Device
The USB-485/4 (Part Numbers: 778476-104, 778476-94, 778476-54, 778476-44, 778476-14) is a 4-Port version of the Serial Interface Device by National Instruments. This device can be installed as a standard serial port. The user’s existing application allows the device to be installed with ease. The user can also install the device with applications written with NI-VISA. This instrument allows the user to transform a USB port into an ASP port. This transformation makes communication with serial devices possible. The NI USB-485/4 has a DB-9 male I/O connector. This Serial Interface Device’s case material is made of hard plastic with a metal baseplate.
The USB-485/4 enables users to communicate with multiple devices at a time. A data transfer rate of 460.8 kb/s is another great feature of this device. The National Instruments USB-485/4 also offers effective Discharge Protection. This Discharge Protection is Electrostatic in nature.
The power needs of the NI USB-485/4 Serial Interface Device from an external supply start at 9 Volts. The maximum value of this power requirement is 30 Volts. The typical power requirement is 225 mA. The maximum power need is mA. This Serial Interface Device can handle RTS/CTS hardware handshake lines. This device has an automatic transceiver-control mode as well. This mode is used for 2-wire RS-485 devices. The National Instruments USB-485/4 allows for extensive cable lengths up to 4,000 ft. This hardware has the feature of software-selectable biasing and is compatible with any package with the Microsoft serial driver interface.
| Model | USB-485-4 |
|---|---|
| Manufacturer | National Instruments |
| Part Numbers | 778476-104, 778476-94, 778476-54, 778476-44, 778476-14 |
| Type | Serial Interface Device |
| Ports | 4 |
| Supported Serial Protocols | RS-422/RS-485 |
| FIFO Size | 128 Bytes |
| Dimensions | 8.3 × 4.9 × 1.4 in. |
| Weight | 0.83 lb. |
| USB-485/4 Manual | User Manual and Maintenance Manual Available for Download |
| Price | Contact a sales representative for a quote. |
Associated part numbers for USB-485-4:
National Instruments USB-485/4 Frequently Asked Questions
Question: Why does the USB-485/4 have multiple part numbers?
Answer: The USB-485/4 has several power input options with different part numbers for each one. The first part number, 778476-104, is China 220 VAC. The next part number, 778476-94, is Korea 220 VAC. The third part number, 778476-54, is North America 240 VAC. Next, part number 778476-44 is Universal Euro 240 VAC. Finally, part number 778476-14 is United States 120 VAC.
Question: Which applications is the NI USB-485/4 compatible with?
Answer: The NI USB-485/4 is compatible with any application that utilizes COM ports on Windows OS.
Question: How many devices can the National Instruments USB-485/4 communicate with?
Answer: The National Instruments USB-485/4 can communicate with a maximum of 31 devices.
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