1-Port RS-232/422/485 Secure Device Server Aten SN3401

The SN3401 Secure Device Server is external IP-based network device that securely connects legacy RS-232/422/485 serial devices to an Ethernet network to be accessed remotely from a computer located anywhere, allowing users to expand the number of serial ports for any host computer over a network.

The SN3401 is especially suited for industrial process control applications, given the abundant use of the Supervisory Control and Data Acquisition (SCADA) systems across many industries for collecting data from PLCs, meters, and sensors via serial ports. The SN3401 bi-directionally translates data between serial and Ethernet formats, and facilitates access to the data from all data collection instruments from local and remote sites through an Ethernet network.

The SN3401 has a number of useful operation modes. It supports secure TCP server / client, secure serial tunneling server / client, secure Real COM, and console management modes for security-critical applications, such as telecom, access control, and remote site management.

The SN3401 can be used as standard Modbus gateway to convert between Modbus TCP and Modbus RTU / ASCII protocols. It can integrate Modbus serial slave devices seamlessly into an existing Modbus TCP network and thereby make them accessible to serial master devices.

• Serial-to-Ethernet Connectivity
  • 1 RS-232/422/485 serial port for secured serial data over Ethernet transmission
  • Software-configurable termination (120 Ω) and pull high/low resistor (1K ohms or 150K ohms) integrated to the RS-485 mode to avoid signal reflection
  • Secured operation modes – Secure Real COM, Secure TCP Server / Client, Secure Serial Tunneling Server / Client,Console Management (SSH), and Console Management Direct (SSH)
  • Standard operation modes – Real COM, TCP Server / Client, Serial Tunneling Server / Client, UDP, Console Management (Telnet), and Console Management Direct (Telnet)
  • Real COM, Real TTY, and Fixed TTY drivers for Windows, Linux, and UNIX
  • Convenient console management access via Java viewer (SSH / Telnet) or third-party clients such as PuTTY
  • Easy console port access via Java viewer and Sun Solaris ready (“break-safe”)
  • Multiple users can simultaneously access the same port – up to 16 connections per port
  • Support Modbus gateway to convert between Modbus TCP and Modbus RTU / ASCII protocols

• Hardware
  • Redundant power input (power jack and terminal block) for fail-safe power
  • Surge protection for serial, Ethernet, and power
  • DIN-rail mounting, wall mounting, rack mounting, and desktop installation available
  • Supports baud rates of 110, 134, 150, 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 19200, 38400, 57600, 115200, 230.4k, 460.8k, 921.6k bps

• Security
  • Supports secured login from browsers with TLS 1.2 data encryption and RSA 2048-bit certificates
  • Configurable user permissions for port access and control
  • Local and remote authentication and login
  • Third-party authentication (e.g. RADIUS)
  • IP address filter for security protection

• System Management
  • Browser access with an intuitive GUI design
  • Web-based quick setup wizard for fast configuration
  • Terminal-based access with a menu-driven UI via Telnet / SSH
  • Online / Offline detection of connected serial devices (including terminal blocks) – automatically sending event notifications when the devices are offline (e.g. power failure) for device status monitoring
  • System event logs and port logs will be saved to an internal memory or Syslog server
  • SNMP agent (v1 / v2c)
  • Event notification – supports notification of SMTP email and SNMP Trap (v1 / v2c)
  • Backup / Restore system configuration and upgradeable firmware
  • 64 KB port buffer prevents data loss when the network is down
  • NTP for time server synchronization
  • Multi-language web-based GUI