Serial communication remains essential in many industrial processes. The Com-Server PoE 3x Isolated from Wiesemann & Theis extends this technology for Industry 4.0 by securely and efficiently integrating up to three serial devices simultaneously into modern TCP/IP Ethernet networks. With galvanically isolated ports, Power-over-Ethernet, and a wide range of network services such as virtual COM ports, Modbus/TCP gateway, FTP client/server, and box-to-box connections, it serves as a versatile platform for automation, data archiving, and IoT networking.

Integration of three galvanically isolated serial interfaces

The Com-Server PoE 3x Isolated features three switchable RS232, RS422, or RS485 ports, each galvanically isolated. This isolation protects connected devices against voltage surges and interference commonly found in EMC-intensive industrial environments. The ports allow simultaneous operation of various serial devices, from sensors and PLCs to measurement systems.

Using Windows COM port redirection, these devices can be accessed via virtual COM ports without modifying existing application software. This capability is particularly valuable in virtual environments (VMware, Hyper-V) or in IT structures without physical COM interfaces.

Transparent communication with box-to-box

The box-to-box function provides bidirectional transparent data connections between two Com-Servers over the network. This allows serial lines to be virtually extended or devices at different locations to be connected without additional software. Automatic reconnect mechanisms ensure stable, continuous connections.

With three ports, multiple devices can be accessed simultaneously through such tunnels. Optional TLS encryption ensures that even security-critical data is transmitted safely.

TCP/UDP socket communication for developers

The Com-Server PoE 3x Isolated offers flexible integration options via:

• TCP server: waits for incoming client connections and forwards data directly
• TCP client: actively connects to a defined host
• UDP: connectionless communication with minimal latency for time-critical applications

All modes can be secured with TLS-PSK and support multipoint transmissions to send data to multiple endpoints at once.

Modbus/TCP gateway

The integrated Modbus/TCP gateway enables conversion of Modbus/RTU (serial) data to Modbus/TCP (Ethernet). This allows existing devices such as energy meters, frequency converters, or measurement transducers to be directly integrated into SCADA or IoT systems. With three ports, multiple Modbus/RTU devices can be connected and managed centrally.

FTP client/server for data transfer

The Com-Server PoE 3x Isolated operates as both FTP client and FTP server. Serial outputs can be uploaded automatically to central servers or stored locally and accessed via FTP. Typical uses include logging data from scales, barcode scanners, or UPS status reports.

Rugged hardware for industrial environments

Technical features overview:

• Three galvanically isolated RS232/RS422/RS485 ports
• Ethernet port (10/100BaseT) with autosensing and auto-MDIX
• PoE support or external DC supply (12–48 V) via screw terminal
• DIN rail mounting for seamless cabinet integration
• Standards compliance: EN 61000-6-2 (immunity), EN 55032:2015 + A1 Class B (emissions)

Galvanic isolation and robust construction ensure interference-free operation even in challenging environmental conditions.

Simple commissioning and management

Using the WuTility software, the Com-Server PoE 3x Isolated can be made operational in just three clicks. Configuration is handled via a web interface (HTTP/HTTPS with certificate management), Telnet, or control sockets. DHCP support simplifies integration into existing networks. Extended protocols such as SLIP, Wake-on-LAN, and 802.1x EAP (MD5) offer additional convenience and security.

Application areas

• Industrial automation: multi-device connectivity for serial controllers and measurement systems
• Automation engineering: connecting remote devices via box-to-box tunnels
• Data management: FTP-based archiving of production and log data
• IoT integration: linking serial devices to cloud or SCADA environments
• Modernizing legacy systems: adding Ethernet capability to existing serial technology

Reliability and warranty

The Com-Server PoE 3x Isolated is built for continuous 24/7 operation and comes with a five-year warranty. Galvanic isolation of the ports provides lasting protection against overvoltage and EMC interference.

Three ports, full flexibility

The Wiesemann & Theis Com-Server PoE 3x Isolated is the ideal solution for networking multiple serial devices in parallel. With multi-port access, secure Modbus/TCP integration, FTP transfer, and TLS encryption, it combines functionality, security, and flexible integration in one compact device – tailored for the demands of Industry 4.0.