General
Magnetic isolation	1,5 kV
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2
Input voltage	12–48 VDC
Air humidity	5–95 % (nicht kondensierend)
MTBF	826.688 Stunden (Telcordia TR/SR)

The Moxa NPort 5430 is a 4-Port Device-Server for serial interfaces, integrating RS-422/485 devices into existing Ethernet networks. The device enables communication between older, serial peripheral devices and modern network environments, particularly in industrial automation and monitoring systems. It allows remote control, monitoring, and configuration of serial end devices over IP-based networks, with data transmission occurring over the Ethernet network. The Ethernet interface supports 10/100BaseT(X) via an RJ45 port and provides magnetic isolation of 1.5 kV, enhancing electromagnetic immunity. The serial interfaces are implemented as terminal blocks and support four independent RS-422/485 channels.

Applications include industrial control systems, building automation, power supply installations, and marine applications, where robust and reliable communication is required. The security features include authentication via a local database, encryption using AES-128, RSA-1024, SHA-1, and SHA-256, as well as support for TLS 1.2 and SNMPv3, protecting communication against unauthorized access. Configuration is performed via a Web Console (HTTP/HTTPS), Telnet Console, or a Windows utility, making operation straightforward even for technically skilled users.

Functions and equipment in detail include a variety of operating modes such as Real COM, TCP Server, TCP Client, UDP, Ethernet Modem, Pair Connection, and Reverse Telnet. Baud rates can be set between 50 and 921,600 bps, with data bits (5–8), stop bits (1, 1.5, 2), and parity types (none, even, odd, Space, Mark) configurable flexibly. For RS-485 interfaces, pull-up/down resistors of 1 kΩ and 150 kΩ are available. Data direction control is managed via ADDC (Auto Data Direction Control), simplifying communication in bidirectional RS-485 networks.

Technology explained simply shows that the NPort 5430 acts as a bridge between serial devices and Ethernet networks. Serial data is converted into IP packets and transmitted over the network. The integrated real-time clock (RTC) and watchdog timer ensure automatic recovery in case of failure, enhancing operational reliability. The dual power supply inputs (12–48 VDC, with 24 VDC for DNV-compliant applications) enable redundant power supply, which is important in critical installations. Power consumption is 320 mA at 12 VDC.

Compatibility and accessories include a wide range of operating systems: Windows 95 to 11, Server 2000 to 2022, Linux Kernel 2.4.x to 6.x, macOS 10.12 to 11.x, Android API from 3.1.x, various UNIX systems (SCO, QNX, Solaris, FreeBSD, AIX, HP-UX), as well as VM platforms such as VMware, Fusion, and Parallels. Network services include ARP, BOOTP, DHCP, DNS, ICMP, IPv4, LLDP, Rtelnet, SMTP, SNMPv1/v2c, TCP/IP, Telnet, and UDP. Time synchronization is performed via SNTP.

Mounting and installation are possible on a desk, wall, or optionally on a DIN rail. The robust metal housing protects against mechanical impacts. Dimensions are 181 x 103 x 33 mm with mounting ears and 158 x 103 x 33 mm without. Weight is 740 g. Operation is via an LCD display and buttons, enabling local control and status indication.

Operational advantages lie in high reliability, achieved through redundant power supply, watchdog timer, and robust housing. Operating temperature ranges from 0 to 55 °C, storage temperature from -40 to 75 °C, with humidity allowed between 5 and 95 % (non-condensing). Certifications include EMC (EN 55032/35), EMI (CISPR 32, FCC Class A), EMS (IEC 61000-4-2 to -4-11), Safety (UL 62368-1), and Marine (DNV). MTBF is 826,688 hours according to Telcordia TR/SR. Warranty is 5 years.

Key terms in the text: Device-Server, RS-422/485, Ethernet network, TLS 1.2, SNMPv3, watchdog timer.