SEL-2905

Serial Port Expander

The SEL-2905 adds 16 serial ports to an SEL Real-Time Automation Controller (RTAC) or SEL Port Server. Pair one or more expanders with a host device to scale serial connectivity to as many as 96 ports. The SEL-2905 uses a dedicated, nonroutable link to keep communication between the host and SEL-2905 off the routable network.

Starting at

$2,700

Configure and order

Add Serial Capacity to RTAC and SEL Port Server Systems

Expand serial capacity by pairing the SEL-2905 with an RTAC or SEL Port Server. Each expander provides up to 16 software-selectable EIA-232/422/485 ports. Connect multiple units to provide up to 96 serial ports per host device. The host automatically detects connected SEL-2905 expanders and presents their serial ports as native ports. Use the host web interface to enable or disable each expander.

Connect Serial Devices Without Additional IP Configuration

The SEL-2905 communicates with the RTAC or SEL Port Server over a dedicated, nonroutable Layer 2 Ethernet link. This enables serial port expansion without adding IP-addressable devices.

Deliver Port-Level Time and Power Distribution

Distribute time from an upstream source to every connected serial device, with IRIG-B output available on each serial port. In addition, directly power fiber-optic transceivers from the serial ports and remove the need for separate power hardware.

Deploy in Harsh Utility Environments

Tested to utility standards for electromagnetic interference (EMI)/ESD, electrical fast transient (EFT)/burst, surge, magnetic fields, vibration, and shock, every SEL-2905 is designed for long-term reliability and backed by a worldwide, ten-year warranty. SEL provides no-cost technical support for the life of the product.

SEL-2905 Features

The Enabled LED and Alarm LED indicate unit status and alert conditions.
Ethernet port LEDs indicate link status and activity.
Serial port activity LEDs indicate the port status and activity.

Connect serial devices by using 16 RJ45 EIA-232/422/485 software-selectable serial ports.
Connect the host and downstream expander devices by using 4 RJ45 copper Gigabit Ethernet ports.
Synchronize the system time with the IRIG-B input and output.
Integrate external alarm systems by using a Form C alarm contact output.
Save panel space by using built-in power supply connections.

SEL-2905 Details

The SEL-2905 provides a simple, scalable solution to increase serial connectivity on SEL RTAC and SEL Port Server devices.

Comprehensive Serial Support

Provide flexible serial connectivity by using 16 RJ45 serial ports that support software-selectable EIA-232/422/485 communications, baud rates from 300 to 115,200 bps, and 5 to 8 configurable data bits. Power connected transceivers by using the +5 Vdc port-level output, and maintain accurate time synchronization by using IRIG-B time signals.

Native RTAC or SEL Port Server Integration

The SEL RTAC or SEL Port Server automatically detects all connected SEL-2905 expanders. Configure all ports using acSELerator RTAC SEL-5033 Software—no expander-level setup is required.

Nonroutable Layer 2 Protocol

The SEL-2905 uses a dedicated, nonroutable Layer 2 Ethernet protocol to connect to an RTAC or SEL Port Server, adding serial capacity without introducing other IP-addressable devices.

Flexible Topologies

Connect multiple SEL-2905 devices to a single RTAC or SEL Port Server by using daisy-chain or star topologies.