General
Interface protocols	RS-232 / RS-422 / RS-485 -
Data bits	5-8 -
Stop bits	1, 1.5, 2 -
Transmission range	40 km -
Wavelength	1310 nm -

The Moxa NPort 6250-S-SC is a Device-Server with two serial interfaces, specifically developed for secure and reliable transmission of serial data over long distances. The device connects serial devices such as sensors, controls, or industrial machines to an Ethernet network via fibre optic. The single-mode variant enables data transmission over up to 40 km, making it particularly suitable for distributed industrial facilities, remote monitoring systems, or networked production environments. The SC fibre optic connector ensures a stable and durable connection that functions reliably even in demanding environments.

Applications

The NPort 6250-S-SC is used in industrial networks where secure, long-distance communication between serial end devices and a network is required. Typical application fields include energy supply, transport infrastructure, manufacturing automation, or environmental monitoring. The high operating temperature range of -40 to 75 °C makes the device suitable for outdoor use or in climatically extreme environments. The IEC 62443-compliant security architecture ensures a high protection standard for industrial networks.

Functions and Features in Detail

The device features two configurable serial interfaces in DB9 format, which can operate in RS-232, RS-422, or RS-485 mode. The baud rate can be set between 50 bps and 921.6 kbps, including support for non-standard baud rates. Flow control is achieved via RTS/CTS, DTR/DSR, or XON/XOFF. For network communication, a 100BaseFX port with SC connector is available, designed for single-mode fibre optic (G.652). Transmission occurs at a wavelength of 1310 nm with a link budget of 29 dB.

Technology Explained Simply

The Device-Server acts as a bridge between serial devices and an Ethernet network. It enables the transmission of serial data over fibre optic over long distances without requiring a direct cable connection. The integrated encryption technology via HTTPS, SSHv2, and TLS 1.2 protects data transmission from unauthorised access. Additionally, the device supports protocols such as SNMPv3, RADIUS, and TACACS+, which are important for network management and authentication in industrial environments. An integrated buffer memory of 64 KB ensures that serial data is not lost even during brief network interruptions. This buffer can be expanded up to 32 GB via an SD card.

Compatibility and Accessories

The NPort 6250-S-SC is compatible with various operating systems, including Windows, Linux, UNIX, macOS, Android, as well as virtualisation environments such as VMware and Parallels. Configuration is performed via HTTPS, Telnet/SSH, or using a Windows utility software. The devices support IPv6, facilitating integration into modern networks. The SC fibre optic connector is standardised and allows use with common fibre optic cables.

Mounting and Installation

The device is housed in a robust metal housing designed for industrial environments. Mounting can be done on a wall, on a table, or optionally on a DIN rail. Power supply is provided via 12 to 48 VDC with a current consumption of 430 mA. Dimensions are 101 x 111 x 29 mm (with mounting ears), and the weight is 240 g.

Operational Advantages

The NPort 6250-S-SC offers high reliability through fibre optic transmission, which is immune to electromagnetic interference. The integrated security technology protects data transmission and meets industrial security standards. Support for non-standard baud rates and the ability to expand the buffer memory increase flexibility when integrating into existing systems. The wide temperature tolerance enables use under various climatic conditions.