MOXA NPort 5430 Serial to Ethernet Device Server

Inside the NPort 5430: Ports, Power, and Build Quality

At its core, this is a 4-port RS-422/485 device server: four terminal-block serial ports handling RS-422 or RS-485 (2-wire or 4-wire) communication, connected through a single 10/100BaseT(X) Ethernet port with 1.5 kV built-in Ethernet isolation. Worth noting clearly: unlike the "I" variants elsewhere in the NPort 5400 Series, this specific model does not include isolation on the serial side, electrically noisy environments should look at the NPort 5430I instead.

Power comes through dual 12–48 VDC inputs, a terminal block and a power jack, so a backup source can keep the unit running if the primary supply drops. For RS-485 applications specifically, the NPort 5430 includes adjustable RS-485 termination and pull-high/pull-low resistors, set through DIP switches on the underside, along with automatic data-direction control that manages transmit/receive switching without requiring the connected device to handle it.

Each of the four serial ports runs its own independent operation mode, so one port can operate as a TCP Server while another runs Real COM, all on the same physical unit. The housing is metal, rated for 0 to 55°C, and mounting is flexible across desktop, DIN-rail, or wall installation.

Communication Protocols and Network Modes on the NPort 5430

Beyond the physical ports, the NPort 5430 runs the same software stack found across the broader NPort 5400 Series.

For applications built around Modbus RTU, the NPort 5430's TCP Server or Real COM modes are what make Modbus RTU over TCP possible, converting the serial-based protocol into something a modern SCADA or PLC network can reach directly .

Fast Setup: Getting the NPort 5430 Online

Every NPort 5430 ships with the same default static IP address used across the NPort 5400 Series: 192.168.127.254, with a netmask of 255.255.255.0. Since this model includes the LCD panel, that IP address is visible right on the front display the moment the unit powers on, one less step than hunting for it with a search utility.

Logging in uses the default account admin and password moxa, and that password should be changed before the unit goes into production, particularly in facilities where more than one person has access to the configuration interface. Configuration itself runs through the Telnet console, the Windows utility, or the web console over HTTP or HTTPS, whichever matches how your team already manages the rest of the network.

The matching NPort 5430 driver, Windows Real COM or Linux Real TTY, is available directly through Moxa's official support site, and installing it lets each serial port appear as a standard local port to existing software. Updating firmware follows the same pattern as the rest of the series: download the current release, upload it through the web console, and the unit restarts on its own once it's applied. Full setup details are also covered in the NPort 5430 user manual and quick installation guide, both available through Moxa's documentation, alongside the NPort 5430 datasheet for anyone comparing specs against other models in the lineup.

Certifications and Compliance Standards for the NPort 5430

Beyond the physical ports, the NPort 5430 runs the same software stack found across the broader NPort 5400 Series.

• UL 62368-1: Confirms safety compliance under recognized industrial standards
• FCC Part 15B Class A: Verifies electromagnetic compatibility for industrial use in North America
• EN 55032 / EN 55035: Confirms EMC compliance for European markets
• IEC 61000-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11: Covers immunity testing against ESD, radiated and conducted interference, surges, and power-frequency disturbances
• DNV: Confirms suitability for maritime applications
• Telcordia TR/SR: Reliability standard used to calculate the unit's MTBF rating

Get the NPort 5430 for Your Industrial Network

The Moxa NPort 5430 is available across Canada and North America, ready to bring your RS-422/485 equipment onto a modern Ethernet network. Not sure it's the right fit compared to the isolated 5430I? Our team can confirm before you order.