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Communications API for Galil controllers and PLCs
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gcaps

FAQ

What is gcaps?

gcaps is a communication server natively supported by gclib to multiplex Galil hardware communication features. It runs in the background on the host computer, as a service or daemon.

Incidentally, the name gcaps is an acronym for the improbable name Galil Controller Asynchronous Proxy Server. Yet another tidbit to impress friends at parties.

How/When is gcaps used?

gclib will attempt to use gcaps whenever GOpen() is called without the --direct or -d switch. Other than this small difference, gclib function calls through gcaps or directly to the hardware behave identically. The first version of gclib supporting gcaps is 299.

Why should gcaps be used rather than direct connections?

Galil recommends gcaps for software development for a number of reasons. The following are a few of the best.

  • Connections through gcaps multiplex a single connection resource. This means that single-channel connection protocols like RS232 or PCI can be shared with as many simultaneous connections as needed. Furthermore, Ethernet-based connections with gcaps leave plenty of Ethernet handles available for other communications, such as MODBUS.
  • All communications features are available to all connecting clients. This means that a software application can be running simultaneosly with Galil's diagnostic software (Galil Design Kit). This significantly simplifies support and aides in debugging
  • Data Records, Messages, and Interrupts everywhere. No longer does one connection steal data streams from another.

How do I install gcaps?

gcaps is bundled in the gclib and GDK installer packages. Install with defaults to get the gcaps service included. gcaps is also available as a standalone installer. Downloads are available on the release notes page.