AT-Modem-Emulator

AT Modem Emulator from Wiesemann & Theis: The 1:1 Replacement for Analog and ISDN Modems

The AT Modem Emulator from Wiesemann & Theis is a modern and industrial-grade solution to replace classic analog or ISDN modems with TCP/IP Ethernet-based communication. Developed for applications in HVAC/refrigeration technology, alarm technology, and measurement technology, the emulator allows seamless integration of serial devices into IP networks without the need for changes to existing hardware or software. With features such as virtual COM ports, box-to-box connections, optional TLS encryption, and Power-over-Ethernet (PoE), the device offers a simple and secure alternative for transitioning from telephone network-based communication to modern networks. This article highlights the technical features, applications, and advantages of the AT Modem Emulator, especially in the context of the shutdown of analog and ISDN networks.

1:1 Replacement for Analog and ISDN Modems

The AT Modem Emulator is a direct replacement for classic analog and ISDN modems used in applications such as remote monitoring, remote alarming, or data collection in HVAC/refrigeration, alarm technology, and measurement technology. Instead of the telephone network, the emulator uses a TCP/IP Ethernet network, making communication faster, more reliable, and future-proof. The serial interface remains pin- and AT command-compatible with standard modems, allowing existing cable connections and device configurations to be retained without changes. Instead of a phone number, only the IP address or URL of the counterpart needs to be configured. This simple switch enables smooth migration from outdated telephone networks to modern IP networks.

Response to the Shutdown of Analog and ISDN Networks

The shutdown of the classic analog and ISDN telephone networks, completed by 2018 at the latest, has posed challenges for many modem-based communication applications. The AT Modem Emulator provides a straightforward solution for this transition by upgrading existing modem-based systems to IP-based communication with a simple component replacement. This is especially important for applications in HVAC/refrigeration technology, alarm technology, and measurement technology. With the AT Modem Emulator, companies can continue to use their proven systems without extensive software or hardware modifications.

Box-to-Box for Transparent Data Transmission

The box-to-box function of the AT Modem Emulator enables the logical connection of two emulators over a TCP/IP network to create a bidirectional and transparent data tunnel. Serial data is transmitted quickly and reliably between devices, with automatic reconnect functions handling connection interruptions. This feature is ideal for applications where two remote serial devices need to communicate, such as remote monitoring of air conditioning or alarm systems. Communication can optionally be secured with TLS encryption to protect sensitive data.

Virtual Modem Ports for Easy Integration

The AT Modem Emulator supports Windows COM redirection for all Windows versions from XP onward, allowing virtual COM ports that provide a virtual AT modem emulator to be created. This feature enables both outgoing and incoming connections without requiring a physical modem. Especially in virtual environments such as VMware or HyperV, the often problematic forwarding of host-side COM ports to the guest system is eliminated. The virtual modem ports are fully AT command compatible, allowing existing software to continue being used without changes.

Robust Interfaces and Flexible Hardware

The AT Modem Emulator is equipped with an RS232 interface that is pin- and AT command-compatible with standard modems, and an Ethernet interface (10/100BaseT) with autosensing and auto-MDIX. The robust design, including the possibility of DIN rail mounting, makes the device ideal for use in industrial environments. Power supply is provided via Power-over-Ethernet (PoE) or via an external supply (12V-48V DC) through a screw terminal. The standards-compliant design ensures high immunity to interference according to EN 61000-6-2 and low emissions according to EN 55032:2015 + A1 Class B, EN 61000-3-2, and EN 61000-3-3.

Easy Commissioning and Management

Commissioning the AT Modem Emulator is extremely simple thanks to the WuTility software and can be accomplished in just three clicks. Configuration is done via web-based management, Telnet, or serial interfaces, with DHCP facilitating network integration. Remote configuration allows device management from any network location, simplifying maintenance and adjustment in large networks.

Please note: No power supply is included in the delivery.

Comparison with Other Modem Replacement Solutions

Compared to other modem replacement solutions, the AT Modem Emulator offers an easy and cost-effective way to replace existing analog and ISDN modems with an IP-based solution. While other solutions often require extensive adjustments, the AT Modem Emulator enables a 1:1 component swap. Support for virtual COM ports and TLS encryption distinguishes it from simpler converters.

Versatile Applications

The AT Modem Emulator is designed for applications in HVAC/refrigeration technology, alarm technology, and measurement technology. In HVAC/refrigeration, it enables remote monitoring of air conditioning systems. In alarm technology, it supports remote alarming of security systems. In measurement technology, it integrates measuring devices into modern networks. Other applications include integrating legacy devices into IP networks.

Durability and Reliability

The AT Modem Emulator is designed for continuous operation and comes with a five-year warranty. The robust hardware and standards-compliant design make it ideal for industrial environments. Support for TLS encryption ensures secure data transmission.

A Future-Proof Solution for Modem Transition

The AT Modem Emulator from Wiesemann & Theis is a compact and reliable solution for 1:1 replacement of analog and ISDN modems in IP networks. With virtual COM ports, box-to-box connections, and TLS encryption, it offers a flexible platform for HVAC/refrigeration technology, alarm technology, and measurement technology. Easy commissioning via WuTility and PoE make it ideal for modernizing modem-based systems.