General
Number of serial ports	32

The Moxa NPort 6650-32 is an industrial terminal server from the NPort 6600 series, connecting up to 32 serial devices over Ethernet networks. It serves as a Device-Server and enables the integration of RS-232/422/485 devices into modern IP-based networks. The connection is made via RJ45 interfaces, with each port individually configurable for RS-232, RS-422, or RS-485. The baud rate can be set between 50 bps and 921.6 kbps, allowing flexible adaptation to various serial end devices. The serial interfaces are implemented via RJ45 connectors, ensuring a robust and industrial-grade connection. The RS-485 resistors are adjustable via DIP switches on the device, enabling application-specific signal transmission adjustments.

Applications

The NPort 6650-32 is designed for industrial environments where reliable and secure communication between legacy serial devices and modern network infrastructures is required. Typical applications include remote machine maintenance, integration of sensors, control devices, or measurement systems into IP networks. Support for IPv6 and Ethernet redundancy (via NM module) makes it suitable for critical installations requiring high availability and network security. Compliance with the security standard IEC 62443 is ensured through modern encryption techniques such as TLS 1.2, SSHv2, and AES-128/256, supporting the protection of sensitive data in industrial networks.

Functions and Features in Detail

The device offers various operating modes, including Real COM, TCP/UDP Server/Client, Reverse SSH, and Terminal mode. The Real COM mode allows serial devices to be used as virtual COM ports under Windows, Linux, and macOS, simplifying integration into existing software environments. Configuration is performed via a web interface, SSH, the MCC tool, or an integrated LCD display with buttons (only on standard temperature models). A 64 KB buffer per port ensures data is not lost during brief network interruptions. The port buffer can be expanded via an SD card, supporting capacities up to 32 GB.

Technology Explained Simply

The NPort 6650-32 features an Ethernet interface with 10/100BaseT(X) and 1.5 kV isolation, protecting it against transient voltage spikes. Network functions include IPv4/IPv6, TCP/IP, SNMPv1/v2c/v3, HTTP(S), DHCP, LLDP, and SMTP, ensuring comprehensive network compatibility. Security functions include authentication via local database, RADIUS, or TACACS+, as well as encryption using AES, HMAC, RSA, and SHA. HTTPS, SSH, and SNMPv3 provide secure communication channels. Power supply is via ±48 VDC (20–72 VDC), making it suitable for applications with industrial power supplies. The housing is made of metal and designed for rack mounting, with mounting ears included in the delivery.

Compatibility and Accessories

The terminal server is compatible with a wide range of operating systems, including Windows 95 to 11, Server 2003 to 2022, Linux (2.4–6.x), macOS 10.12–11.x, Unix derivatives, and Android from version 3.1. Software functions include Real COM, PPP, Reverse Telnet/SSH, and RFC2217, enabling flexible use in various network environments. Support for IPv6 and Ethernet redundancy (via NM module) expands its application possibilities in modern, redundant networks.

Mounting and Installation

The device is designed for rack mounting and is delivered with two mounting ears. Dimensions are 440 x 195 x 44 mm (without ears). Mounting is performed in standard 19-inch racks. Installation requires connecting serial devices via RJ45 connectors and connecting to the Ethernet network. Configuration can be done via the web interface or the MCC tool. The quick start guide included in the delivery supports setup.

Operational Advantages

The NPort 6650-32 offers high reliability with an MTBF of up to 850,000 hours (Telcordia). Integrated security functions, along with support for IPv6 and Ethernet redundancy, make it suitable for critical industrial applications. Flexible configuration and support for many operating systems simplify integration into existing IT infrastructures. The expandability of the port buffer via SD card allows adaptation to high data loads.

Delivery Contents

The delivery includes the NPort 6650-32 terminal server, two rack mounting brackets, a DB9 to RJ45 cable, a power cord or power adapter (model-dependent), a quick start guide, and a warranty card.