eXP-9435 Communication Port Expander

Expand Your Substation Data Concentrator and Provide Secure Access for Your Entire Enterprise

The eXP-9435 is a compact addition to your ePAQ-9410/9420/9425 Multifunction Gateway, which expands the number of serial or IP ports for access to additional devices or IEDs.

Housed in a 19” width enclosure with a 1U footprint, the eXP-9435 has rear access connections for convenient rack mounting. Serial communication ports may be accessed through rear panel fiber ST connectors or DB-9 connectors.

Convertible Communication Ports for Flexible Installations

The eXP-9435 provides 16 additional ports which are convertible RS-232 or RS-485 and may be allocated on a per port basis. Optionally, these may be provided as eight serial fiber ports with eight ST (multimode) connectors, or as a mix of eight RS-232/485 ports and four fiber ports.

The 10/100 BaseTX connection is through a standard RJ-45 connection, with the 100 BaseFXinterface using standard ST fiber connectors.

  •  Expand your QEI Substation Platforms to additional Devices, Protocols and Communication Interfaces with a Convenient Modular Package
  • Ethernet 10/100 BaseTX and 100 BaseFX Ports for IP accessibility
  • Sixteen RS-232/RS-485 or eight Serial Fiber Ports for incorporating Future, Current or Legacy Devices
  • Serial Ports May be accessed through Rear Panel DB-9 or ST Fiber Connections
  • Works within your Substation plan to meet NERC-CIP and Cyber Security requirements
  • Quick and easy configuration with provided ConfigWiz® Windows Software
  • Front Panel LED Indicators for easy assessment of operation
  • IRIG-B Interface for System Time Synchronization

What Our Customers Have to Say

“Our relationship with QEI began in 1986 with the deployment of a PDP-11 based SCADA system and four RTUs. Over the decades, that system has been continuously upgraded and expanded to support the growing needs of our rail operations. QEI’s solutions have provided the real-time visibility, control, and reliability required for mission-critical traction power infrastructure. With hundreds of field RTUs installed and control houses to advanced master station software, QEI has remained a trusted technology partner in supporting safe and efficient operations across our network.”

The National Passenger Rail System across USA

“City of Concord has partnered with QEI since 1986, and throughout that time their solutions have continued to support our evolving operational needs. From early-generation RTUs to latest upgraded RTUs, capacitor controllers and multiple SCADA master station enhancements, QEI has been a dependable technology provider for our system. Our most recent investment in February 2025 to upgrade to QSCADA reflects the confidence we have built through decades of successful collaboration.”

SCADA Coordinator at City of Concord, North Carolina

“QEI’s mCAP and eCAP capacitor bank controller solutions are well-suited for Vietnam’s power distribution networks. The products not only meet technical requirements but also deliver clear economic benefits by optimizing system operation and reducing power losses. In addition, QEI’s professional support services represent a significant added value, contributing to the overall success of project implementations.”

My Phuong Trading Company Ltd. (MPCO)

“QEI is always making improvements to their product, and it is almost always a result of customer feedback. QEI listens, acts, and highlights the improvements every year at the user conferences. Great job QEI!”

North American Utility

“QEl did a fabulous job installing and configuring four SCADA servers for our Quad-Redundant QEI SCADA system.”

Florida Water Utility

“For over the last 10 years, we have had a QEI SCADA system that monitors our two substations and line reclosers. We have been very happy with the quality of their product and more importantly, the service that they provide to maintain the system. Everyone at QEl really seems to know their product inside and out. QEI is a company that not only makes a great product but backs it up with outstanding service.”

Village of Lake Placid

“Our relationship with QEI spans more than 50 years of continuous SCADA modernization. From early traction power control systems to today’s redundant enterprise platform QSCADA, QEI has consistently delivered solutions that support safe, efficient, and reliable rail operations. Their systems now provide centralized control of electric traction, signal power, and facilities power across an extensive commuter and city rail network with hundreds of RTUs in service.”

 Northeast Corridor transit systems, USA

“We have utilized QEl for our SCADA needs for over 20 years. They provide an excellent system, both software and hardware. QEl’s staff has alwavs been there for our needs and is always helpful and friendly We highly recommend QEl’s system and their maintenance contracts to keep your system current.”

Emerald Coast Utilities Authority (ECUA)

“The new website is very user-friendly. I really like the Customer Portal, which provides quick access to manuals, presentations, and software updates. Q Tips and more.”

City of Wilson, NC

“We have always been able to rely on QEl for their technical knowledge and support. Thank you QEI.”

Mid-Atlantic Municipal Utility

“It was a pleasure working with the QEI Engineer during the Onsight installations, He was very professional and worked through the few hiccups that we encountered to get the system up and running.”

Controls & Communications Engineer at Easley Combined Utilities

It’s Easy to Get Started

STEP 1:

Schedule a Consultation Call

Let’s talk through your goals and what your current infrastructure looks like.

STEP 2:

We’ll Collaborate to Develop a Solution

We’ll develop a plan to modernize your infrastructure to meet your goals.

STEP 3:

Experience the Advantages of QEI

We’ll coordinate and execute the plans for your upgraded system.