Key features

• • RS422/RS485 interface via terminal block for industrial wiring.
• • Designed to be more stable against noise and electrical damage on RS422/RS485 lines.
• • IPv4/IPv6 dual stack (incl. ICMPv6/TCPv6/UDPv6) with DHCPv6 address auto-configuration.
• • Serial tunneling modes: TCP Server, TCP Client, UDP, and AT Command (server/client).
• • Security options: SSL + IP/MAC filtering + password-protected configuration.
• • Useful extras: separator (packet framing) and Windows Virtual COM driver (ezVSP).

Serial tunneling over TCP/IP (TCP Server, TCP Client, UDP, AT Command)

CSE-H55N2 converts RS422/RS485 serial data to TCP/UDP packets (and vice versa), enabling long-distance monitoring and control over LAN or the Internet. Choose TCP Server for passive listening, TCP Client for active outbound connections, UDP for connectionless block transfer, or AT Command mode for flexible connection control.

• • Supports baud rates from 300 bps up to 230,400 bps (RS422/RS485).
• • “Multiple Connection” is available on firmware v2.3A or later (useful for multi-monitoring scenarios).
• • Includes TELNET COM Port Control (RFC2217) option in TCP Server/Client mode.

Stability against noise & electrical damage

CSE-H55N2 is an upgraded design focused on stability for RS422/RS485 lines. It includes built-in biasing resistors and TVS protection on the serial interface, plus input-side protection circuits to help withstand industrial power and wiring conditions.

• • RS422/RS485 lines include embedded biasing resistors and TVS for surge/noise protection.
• • Protection circuits: overcurrent, reverse voltage, and surge protection.
• • Industrial operating temperature range: -40°C to +85°C.

Security & remote monitoring

For deployments across plants, substations, and remote sites, CSE-H55N2 provides security options to limit and protect access. Monitor current status and sessions using ezManager or TELNET, and restrict management features with passwords and filtering rules.

• • SSL support for encrypted TCP sessions (secure serial tunneling).
• • IP & MAC filtering to restrict hosts or entire networks.
• • Monitoring tools: ezManager (status + configuration) and TELNET (management console).

Separator (packet framing) & Virtual COM port (ezVSP)

Many serial protocols are message-based rather than continuous streams. The separator feature helps group incoming serial bytes into meaningful packets before sending them over the network. For Windows applications that expect a local COM port, the ezVSP driver creates a Virtual COM port connected to the device over Ethernet.

• • Separator settings for packet fragmentation / message framing.
• • ezVSP Virtual COM driver for Windows (legacy software compatibility).
• • Extra utility: ezTerm for quick TCP/IP communication testing.