Crestron SIMPL Windows Software

Crestron Control Systems

Why Program Control Systems?

The term program refers to the instructions loaded into the control processor that

cause it to operate in an intended way. For example, to control a DVD player, you

must write a program that tells the control system which port the unit is connected to,

what IR codes to send to it, and which buttons on a touchpanel trigger those

functions. A typical program may contain hundreds of similar instructions designed

to allow control of an entire rack full of audio/visual equipment. All programs are

written in the SIMPL programming language. Crestron has created the SIMPL

Windows development application expressly for writing in this language.

Elements of a Control System

Main Processor

The Crestron control system processor is the heart of a complete remote control

system. Its basic function is to integrate and communicate with equipment made by

other manufacturers. To do this the control system’s working memory (RAM) must

be programmed to use the specific instructions, or program, to communicate with the

devices being controlled.

In addition to working memory, control systems contain an operating system (OPS).

Similar to the operating systems that run personal computers, the OPS is a set of

instructions that enables the control system to understand the program that has been

loaded into it and to control equipment connected to the system by various

input/output devices (an infrared module, for example).

The need to upgrade the OPS will arise if programmers want to take advantage of

new programming capabilities, new Crestron hardware devices, or to correct a

problem found in a previous version. You can download control system updates from

the Crestron Web site. Operating system files on this site have file names such as

c2.v3080.cuz, with different extensions depending on the type of processor. Before

downloading, make sure the update is compatible with your control system by

verifying that the file name matches the OPS version number and the extension

corresponds to your control processor model.

2-Series processors use a CUZ file to load the operating system to the control

system. 2-Series processors provide 32 MB of DRAM, which is expandable to 4GB

for processors that include a Compact Flash slot. The size of the program, and

number of analog, digital, and serial signals that can be processed are limited only by

the amount of available RAM. In addition to RAM, the processor provides 256KB of

NVRAM (non-volatile RAM) that is used to store SIMPL+ variables and variables

expressly written to it by some “memory” symbols in SIMPL. These symbols

include Analog RAM, Digital RAM, and Analog Non-Volatile Ramp, and are

commonly used for lighting or volume presets. Non-volatile RAM retains data

written to it when power is turned off. The 256K of NVRAM may also be split to use

64K or 128K as an NVRAM disk.

X-Series processors have a base Monitor in addition to the operating system, as well

as separate TCP/IP stacks, all contained in a UPZ file. The separate stacks are for

systems that include the CNXENET or CNXENET+ card for Ethernet

communication. X-Series processors allow a total of 16373 user-defined digital

Primer – DOC. 6253 Crestron SIMPL Windows • 5

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 75 76

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