TIWAY 1 Overview
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TIWAY 1 TI505 NIM User Manual
1.3
TIWAY I UNIVERSAL COMMAND LANGUAGE, UCL
TIWAY I provides a Universal Command Language for all communication on the
network. The UCL consists of a set of high-level request/response transactions known as
Primitives. Primitives are used for:
Reading and writing data
Acquiring status of devices attached to the network
Performing control operations on attached devices
The Host issues requests (Primitives) to the NIMs and Secondary Adapters. The
secondaries then perform the requested operations on the attached devices and return
the appropriate response to the Host to complete the transaction. See Figure 1.
Host Systems
Host System
Interfaces
Command Initiators
Siemens
Programmable
Controllers
Secondary Adapters
Non–Siemens
Network Media
Responders
devices
Figure 1 TIWAY I System Block Diagram
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