Serial I/O Upgrades for Smart City Transportation


Sealevel partners with a leading designer, OEM and integrator of payment and information solutions for public transportation systems. Their suite of products includes ticket vending machines, passenger analytics devices, revenue management systems and complete backend systems such as charging systems used in toll roads. The company’s systems are deployed in support of local and state government transportation agencies in San Francisco, Los Angeles, Chicago and Miami.

As they began migrating the single-board computers (SBCs) in their ticket vending machines to an updated operating system, they needed a long-term solution to provide serial connectivity for peripheral devices. Additionally, they saw many regional transportation agencies upgrade their buses to include a more robust passenger analytics system and needed a reliable serial I/O solution to support these integrations.

A Sealevel Story About American-Made I/O

This is the story of a smart city tech integrator determined to get better data using products Made in the USA… and the South Carolina company that fulfilled all their requirements.

The Solution

To meet their specific needs, Sealevel’s team recommended our 2165-OEM and 2223 serial adapters. The SeaLINK® 2165-OEM USB 2.0 serial adapter is used to upgrade their ticket vending machine kiosks and features on-board status LEDs to display serial data activity, the board heartbeat, electrical interface selection and line termination state. The serial ports are recognized as standard COM ports by the host system, enabling compatibility with legacy software, too. Our SeaLINK® 2223 USB to serial interface, with a firmware upgrade from Sealevel’s software engineers, provides I/0 for their passenger analytics system. The 2223 provides an easy way to connect two serial devices to a single USB port. And the electrical interface settings are maintained locally which allows the host computer to be repaired or upgraded without reconfiguring the serial ports.


SeaLINK® 2165-OEM Serial Adapter

  • 16 multi-interface serial ports
  • Each serial port is individually configurable
  • Supports a wide range of standard and non-standard baud rates
  • Wide operating temperature range of -40° to +85°C



SeaLINK® 2223 Serial AdapterUSB to 2-Port RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial Interface Adapter

  • Each port is individually software configurable for RS-232, RS-422 or RS-485
  • Electrical interface settings are maintained across multiple computers
  • Standard operating temperature range of 0° to +70°C and optional extended temperature range

As a result of our robust, reliable I/O devices, as well as our in-house manufacturing for supply chain stability, the OEM continues to rely on and integrate Sealevel hardware and software.