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National Instruments USB-485/4 4-port RS485/RS422 serial interface device
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National Instruments · USB

USB-485/4

The National Instruments USB-485/4 adds four RS485/RS422 serial ports to a computer through USB. It provides DB-9 male connections and supports serial rates up to 460.8 kbaud.

ManufacturerNational Instruments
ModelUSB-485/4
Part Number778476-14
Product Type4-port RS485/RS422 serial interface device
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Free Shippingfull policy linked
30-Day Warrantystandard coverage
30-Day Returnspolicy applies
Technical Supportmodel & compatibility help
Serial ports4
ProtocolsRS485 and RS422
Maximum baud rate460.8 kbaud
Serial connectorsDB-9 male
PowerExternal power supply required
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Overview

Product overview

Key product information and technical features.

The USB-485/4 is an external USB serial interface for communicating with RS485 and RS422 devices. Its ports appear as standard COM ports for use with applications that support serial communications.

Installation requires an external power supply. NI's installation guide instructs users to install NI-Serial software before connecting the hardware.

  • Four non-isolated RS485/RS422 serial ports.
  • 128-byte FIFO size.
  • Standard COM-port access for serial applications.
  • RTS/CTS hardware handshake support.
Verified specifications

Technical data

Verified product specifications.

Number of serial ports4 ports
Serial standardsRS485 / RS422
Maximum baud rate460.8 kbaud
Serial connector typeDB-9 male
FIFO size128 bytes
IsolationNon-isolated
Host connectionUSB 2.0
Power requirementExternal power supply
Condition & included items

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Condition

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Included

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Revision

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Compatibility

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National Instruments

Manufacturer

USB

Host interface

USB-485/4

Four-port RS485/RS422 interface

Software

NI-Serial installation is documented in the original USB serial installation guide.

Confirm driver support for the intended operating system and the external power supply before integration.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI USB-485/4 Product PageProduct Page · ni.com
Open →
NI Serial Hardware Specifications and Features GuideSpecifications And Hardware Reference · docs-be.ni.com
Open →
USB Serial Hardware and Software Installation GuideInstallation Guide · download.ni.com
Open →
NI USB-485 Connection to Three-Pin EIA-485 DevicesTechnical resource
Open →
Shipping, warranty & returns

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Warranty
30-Day Warranty. Standard coverage applies.
Returns
30-Day Returns. Return policy applies.
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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Does the USB-485/4 support RS232?

NI specifies RS485 and RS422 for this model, not RS232.

Is the USB-485/4 powered only through USB?

No. NI's installation guide requires connecting an external power supply for the USB-485/4.

Can applications access it as a standard serial port?

Yes. NI describes the interface as appearing as standard COM ports for serial communications applications.

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