How the ICS Series (RS232/RS422/RS485) Delivers Reliable Serial-to-Ethernet Connectivity for Seamless, Scalable Displays and Information Systems
Modern digital signage and public information networks increasingly rely on Ethernet connectivity and serial device servers for centralized management, faster content updates, and integration with other networked systems. Maintaining an enterprise-wide network is always a challenge, especially when new technology must incorporate legacy solutions. No matter how old or how long network administrators must support legacy systems, their challenge is to minimize disruptions and maximize network performance. Meeting that challenge requires careful planning as serial connectivity is one of the oldest technologies still in use.
A serial device server bridges the gap between legacy serial connections and IP-based protocols. Companies can maintain serial connections to existing devices by placing servers such as Planet’s ICS server series between the device and the Ethernet network. The multi-point communications allows existing serial devices to connect to a serial device server which forwards the data to an IP-based network.
The Challenge: Connecting Legacy Serial Devices to IP Networks
Although only 14% of new installations use serial connections, down from 17% in 2025, nearly 70% of factory operations, for example, still use serial communications. For IT departments, that means they must integrate 1960s technology into 21st-century networks. When serial connections were first deployed, data transfer rates were 300 bits per second (bps) unless a T1 line was available. A far cry from today’s gigabyte demands.
Eventually, serial connectivity moved beyond the RS232 cabling that only supported point-to-point connections up to 15 meters or 50 feet. Today, serial connections (RS422) can support faster and longer full-duplex links with multiple devices connected to a single server. The RS485 operates as an industrial multi-point connection with bidirectional communications between multiple devices and a single server.
Serial communication relies on the RS232, RS422, and RS485 standards. These standards contain the electrical, functional, and mechanical specifications for interfaces between electronic devices.
The primary differences among the three interfaces are outlined below
- RS232 supports point-to-point communications up to 15 meters or 50 feet. It was designed to connect computers to other devices such as monitors, printers, and modems with transmission speeds up to three megabits per second (3 Mbps).
- RS422 interfaces are common in industrial environments using motion and machine controllers. The interface can broadcast data to as many as ten devices and up to 1,200 meters or 4,000 feet. The signal is unidirectional, meaning the connected devices cannot respond on the same wire. Information networks used the interface to send data to multiple displays.
- RS485 facilitates factory and building automation with its multi-point capability that allows up to 32 devices to send and receive data over a shared twisted pair. Its range is the same as the RS422 interface or 4,000 feet and transmits data up to 40 Mbps.
Replacing serial connections in buildings or factories can be expensive. If automated systems are tied to the network, upgrading equipment can result in disruptions and costly downtime, especially when compatibility is a concern.
Serial device servers provide a bridge between these environments.
Placing a Planet ICS server between the serial and network connections eliminates the need for equipment replacement, minimizes incompatibility risks, and reduces the chance of operational disruptions. It enables information networks to leverage existing configurations while accessing modern technologies.
How PLANET ICS Serial Device Servers Bridge Serial and Ethernet Networks
Planet’s ICS series consists of serial device servers designed to convert RS232, RS422, or RS485 serial communication into Fast Ethernet or IoT TCP/IP connectivity. These units enable legacy serial equipment to connect to IP networks affordably without requiring hardware replacements. All models share the following core features:
- Translate RS-232, RS-422, and RS-485 interfaces to 10/100BASE-TX Ethernet
- Support Virtual COM (VCOM), TCP Server to Client, UDP, Serial Telnet, and Remote Pair modes
- Access through Web, Telnet, SNMP, and VCOM utility interfaces for remote management
Planet offers a standard and industrial series of servers.
- The standard series (ICS-110 or ICS-120) are commercial-grade desktop units designed for indoor environments (-10°C to 60°C operating temperatures).
- The industrial series (ICS-2100, ICS-2105, and ICS-2102) are heavy-duty IP30 metal-cased units with operating tolerances from -40°C to 75°C. They have DIN-rail or wall mounting options and dual power inputs with auto-failover.
The ICS series provides key features and flexible configurations needed in public and private information networks:
Extended Network
The ICS-210xT series offers a fiber interface, allowing companies to choose the appropriate connectivity from multi- to single-mode fiber or SC/LC integration. For example, models such as the ICS-2105AT have one SFP fiber slot for small-form factor pluggables. These features can extend a network from 550 meters (1,800 feet) using multi-mode fiber to 120 kilometers (74 miles) with single mode.
Extending network reach through a fiber uplink means IT departments can leverage high-speed connectivity without costly equipment replacement. An industrial-grade ICS model can reside in an outdoor environment, such as a train station or college campus, or industrial setting while sending and receiving data from a centralized location via high-speed fiber. Content can be refreshed faster than with a serial-only connection.
Remote Management
Planet’s ICS series provides serial-to-Ethernet connectivity that allows remote network management using Web, Telnet, or VCOM interfaces. The serial and IP connections allow network administrators to:
- Identify connection drops or failures instantly using remote management tools
- Eliminate manual checking of hardware or wires
- Simplify management of IP- and serial networks through a single interface
Older technologies limit network observability, requiring IT personnel to troubleshoot while onsite. Planet’s remote management features provide the visibility network engineers need to maximize uptime without the delays created by deploying a technician to a retail or hospitality location.
Stable Performance
The industrial ICS-210xT series offers immunity against heavy electrical surges and noise for reliable operations in outdoor environments such as curbside traffic control. Combined with its operating temperature of -40 to 75°C and IP-rated case, the series can be placed in the most challenging environments.
The ICS industrial series supports a range of voltages from 9 to 48V DC to 24V AC and provides a DB 9-pin RS232 interface with a terminal block for RS422 or RS485 connections. The series delivers stable performance regardless of operating temperatures, electromagnetic interference, or electrical surges.
Dual Power Supplies and Alerts
A dual-power input system enhances reliability and uptime. If the primary power supply fails, the hardware failover function activates the secondary power supply automatically to keep the device operating. Some models come with a fault alarm system that notifies staff if an error occurs.
Overall, Planet’s ICS delivers the mission-critical features for a stable environment when serial communication meets IP networks.
Why Use a Serial Device Server?
Tying older technologies to current operating environments is full of risk. Whether it’s replacement costs or operational disruptions, ICS solutions are designed to simplify installation, bridge gaps in old versus new technology, and provide a stable operating architecture. In addition, Planet’s expertise in serial device server technology helps customers to:
- Lower cost and extend the usable life of serial devices
- Upgrade and maintain systems faster
- Centralize network management and monitoring
- Integrate easily into IP-based networks
The ICS product line helps public and private information networks capitalize on existing solutions without the disruption of full-scale replacements. Whether campus-based signage or transportation wayfinding, a serial device server plays a vital role in bridging the past with the future. Contact us to learn more about the ICS product line or to discuss serial to Ethernet connectivity with Planet’s knowledgeable staff.
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