General
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2
RS-485 Pull High/Low	1 kΩ / 150 kΩ
Air humidity	5–95 % nicht kondensierend
MTBF	1.934.102 Stunden
RS-485 ADDC

The Moxa NPort 6250-M-SC is a compact, robustly built Device-Server with a serial RS-232/422/485 port, designed for the secure and reliable integration of serial devices into Ethernet networks. The device enables the transmission of serial data over IP-based networks and is specifically designed for use in industrial environments where high reliability and security are required. It supports modern security protocols such as TLS 1.2, SSHv2, and HTTPS, ensuring encrypted data transmission and protection against unauthorized access. Compliance with the requirements of the IEC 62443 standard makes it suitable for security-critical infrastructures, for example in building automation, transportation, or process industry.

Applications

The NPort 6250-M-SC is suitable for applications where serial devices such as sensors, controllers, printers, or measuring instruments need to be integrated into existing networks. Support for IPv6 enables use in modern, future-proof network infrastructures. Flexible configuration via a web interface, Telnet, or Windows-based software simplifies setup and maintenance. The ability to expand the buffer memory via an SD slot provides additional flexibility for data transmission, especially in environments with irregular network availability.

Functions and Equipment in Detail

The device features a configurable serial port with DB9 connector, which can be switched between the standards RS-232, RS-422, and RS-485. Baud rates can be set from 50 to 921,600 bps, including non-standard baud rates. Data transmission can be configured with various settings for data bits (5–8), stop bits (1, 1.5, 2), and parity (None, Even, Odd, Space, Mark). Flow control is supported via RTS/CTS, DTR/DSR, or XON/XOFF. For RS-485, integrated pull-high/low resistors (1 kΩ / 150 kΩ) and a terminator (120 Ω) are provided, with support for ADDC (Automatic Data Direction Control).

Technology Explained Simply

The Ethernet port operates at 10/100BaseT(X) and supports Auto MDI/MDI-X, simplifying cabling. Magnetic isolation of 1.5 kV protects the device from transient voltage spikes. Network protocols include TCP, UDP, Telnet, HTTPS, SNMPv1/v2/v3, DHCP, DNS, LLDP, PPPoE, and IPv6. Configuration is performed via Web Console, Telnet/SSH, a Windows utility, DSU, or MCC Tool. The integrated buffer of 64 KB per port ensures that data is not lost during brief Ethernet outages. Expanding the buffer memory via an SD slot enables higher data capacity.

Compatibility and Accessories

The NPort 6250-M-SC is designed for use with serial devices communicating via RS-232, RS-422, or RS-485. Power supply is via 12–48 VDC, with power consumption of 285 mA at 12 VDC. The device is designed for operation in environments with temperatures from 0 to 55 °C, with T-models capable of operation up to 75 °C. Storage conditions are from -40 to 75 °C with humidity of 5–95 % (non-condensing). The metal housing is compact and allows installation on desktop, wall-mounted, or on a DIN rail (optional). Certifications include EMC (EN 55032/35, FCC Part 15B Class A), EMS (IEC 61000-4-2 to -4-11), Safety (UL 60950-1, UL 62368-1), Transportation Control (NEMA TS2), as well as vibration and free-fall (IEC 60068-2-6 / -2-34). The MTBF is 1,934,102 hours, and the device complies with environmental standards RoHS, CRoHS, and WEEE.

Mounting and Installation

The device can be placed on desktop, mounted on wall, or optionally installed on a DIN rail. Dimensions are 90 x 100.4 x 29 mm (with mounting ears) or 67 x 100.4 x 29 mm (without ears). Weight is 190 g. Installation is done via integrated mounting ears or an optional DIN rail holder.

Operational Advantages

The NPort 6250-M-SC provides a reliable and secure connection between serial devices and Ethernet networks. Support for modern security protocols and compliance with IEC 62443 enhance security in critical applications. Flexible configuration and the ability to expand the buffer via SD card increase flexibility and reliability. The robust construction and certifications for industrial environments ensure stable operation under demanding conditions.