Excellink SPort II RS-232 RS-422 Serial Interface Card Module 901-18481T

Excellink SPort II RS-232 RS-422 Serial Interface Card Module 901-18481T

The Excellink SPort II is an RS-232/RS-422 serial interface card produced by Excellink Inc. of San Jose, CA. It provides dual-standard serial communications (RS-232 and RS-422) via a DB-25 connector on the bracket face and an internal ribbon header for system-side connection. This type of serial interface module was designed to add or expand serial port capability within a compatible Excellink chassis or host system, allowing connection of serial peripherals, terminals, and data acquisition equipment using the RS-232 and RS-422 standards.

Specifications & What's Included

• Brand: Excellink Inc.
• Model: SPort II
• Board Part Number: 901-18481T
• Interface Standards: RS-232 and RS-422
• External Connector: DB-25 (25-pin D-sub female) on bracket
• Internal Connector: 40-pin ribbon header (system-side interface)
• Form Factor: Card/Module with metal mounting bracket
• PCB: Green, populated with multiple DIP ICs, SMD components, and an Excellink-branded main controller IC
• Manufacturer Location: San Jose, CA (printed on bracket label)
• Card only — no cables or chassis included

Applications

RS-232 and RS-422 serial interface cards like the Excellink SPort II are used to connect serial devices — including terminals, barcode scanners, modems, instruments, and industrial controllers — to a host system. RS-232 is the standard short-distance serial protocol widely used in computing and instrumentation since the 1960s, while RS-422 extends serial communication over longer cable runs with differential signaling, making it common in industrial and data acquisition environments. The SPort II was designed for integration into Excellink-branded systems and chassis as a plug-in serial expansion module, typical of the modular rack and chassis architectures used in telecom, industrial automation, and laboratory data systems during the 1990s. Serial interface modules of this type remain relevant for legacy system maintenance, industrial control upgrades, and interfacing older serial peripherals with modern systems.