Moxa NPort 6650-8 8-Port Secure Terminal Server

Technical Overview

The Moxa NPort 6650-8 is an 8-port rackmount secure terminal server engineered to reliably connect a wide array of serial devices, including terminals, modems, data switches, mainframe computers, and POS devices, to an Ethernet network. It ensures secure data transmission through the use of SSL and SSH protocols, offering robust security features essential for sensitive industrial and commercial applications.

Key Features

8 RS-232/422/485 serial ports
Supports non-standard baudrates up to 921.6 kbps
Rack-mountable metal housing
LCD panel and push buttons for easy IP address configuration
Secure operation modes including Reverse SSH, Secure Pair Connection, Secure Real COM, Secure TCP Client/Server, SSH
Automatic Data Direction Control (ADDC) for RS-485
Software-configurable 120-ohm termination and 1 kΩ/150 kΩ pull high/low resistors for RS-485
Port buffers (64 KB per port) for storing serial data when Ethernet is offline
Supports IPv6
NEMA TS2 traffic control certification
Wide range AC power input (100 to 240 VAC)

Technical Specification Matrix

Parameter	Value
Dimensions (without ears)	440 x 195 x 44 mm (17.32 x 7.68 x 1.73 in)
Weight	3460 g (7.63 lb)
Operating Temperature	0 to 55°C (32 to 131°F)
Storage Temperature	-40 to 75°C (-40 to 167°F) (package included)
Ambient Relative Humidity	5 to 95% (non-condensing)
Input Voltage	100 to 240 VAC, 47 to 63 Hz
Input Current	140 mA @ 100 VAC
Housing	Metal
Installation	Rack mounting
Serial Standards	RS-232, RS-422, RS-485
Number of Ports	8
Baudrate	50 bps to 921.6 kbps (supports non-standard baudrates)
Data Bits	5, 6, 7, 8
Stop Bits	1, 1.5, 2
Parity	None, Even, Odd, Space, Mark
Flow Control	RTS/CTS, XON/XOFF, DTR/DSR
RS-485 Pull High/Low Resistor	1 kΩ, 150 kΩ (software-configurable)
RS-485 Data Direction Control	Automatic Data Direction Control (ADDC)
RS-485 Terminator	120 Ω (software-configurable)
Ethernet Interface	10/100BaseT(X) auto-sensing
EMC	EN 55032/35, EN 55032/24
EMI	CISPR 32, FCC Part 15B Class A
EMS	IEC 61000-4-2 ESD (Contact: 4 kV; Air: 8 kV), IEC 61000-4-4 EFT (Power: 1 kV AC, 0.5 kV DC; Signal: 0.5 kV), IEC 61000-4-5 Surge (Power: 2 kV AC, 0.5 kV DC), IEC 61000-4-6 CS (3 V), IEC 61000-4-3 RS (80 MHz to 1 GHz: 3 V/m), IEC 61000-4-8 PFMF, IEC 61000-4-11 DIPs
Safety	IEC 62368-1, UL 62368-1, EN 62368-1, UL 60950-1
Traffic Control Certification	NEMA TS2
Vibration	IEC 60068-2-6
Freefall	IEC 60068-2-34

Industrial Applications

1. Secure Remote Access for Traffic Signal Controllers

This device can securely connect multiple legacy traffic signal controllers (using RS-232/485) to a centralized SCADA system over an Ethernet network. The NEMA TS2 certification ensures reliability in traffic control environments.

Problem Solved

Enables secure, reliable, and centralized monitoring and control of distributed traffic infrastructure that relies on serial communication, overcoming distance limitations and enhancing data security.

RS-232RS-485SCADANEMA TS2Secure Terminal ServerRemote MonitoringTraffic Control

2. Consolidating Serial Device Connectivity in Factory Automation

In a factory environment, the NPort 6650-8 can integrate various industrial devices such as PLCs, HMI panels, barcode scanners, and legacy sensors, which often use different serial standards (RS-232, RS-422, RS-485), into a unified Ethernet network for data acquisition and control.

Problem Solved

Addresses the challenge of connecting a mix of older and newer serial devices to modern Ethernet-based control systems, providing a robust and secure bridge for data exchange.

RS-232RS-422RS-485PLCHMIIndustrial EthernetData AcquisitionFactory AutomationLegacy Systems

3. Centralized Secure Console Access for Rack-mounted Servers and Networking Gear

Ideal for data centers or server rooms, this rackmount terminal server allows IT professionals to establish secure remote console access (via SSH/SSL) to multiple rack-mounted servers, routers, and other networking equipment that have RS-232 console ports, facilitating out-of-band management and troubleshooting.

Problem Solved

Provides a secure and efficient way for administrators to manage and troubleshoot numerous serial-interfaced devices in a data center remotely, reducing the need for physical presence and improving operational efficiency.

RS-232 ConsoleData Center ManagementRemote AccessSSHSSLOut-of-Band ManagementNetwork DevicesRackmount