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Crestron 3-Series Control Systems Reference Guide

Reference Guide – DOC. 7150A 3-Series Control Systems • 61

Running Multiple Programs

Device Registration Considerations

The 3-Series processors run multiple programs simultaneously to allow programmers

to independently develop and run device specific programs for AV, lighting, HVAC,

security, etc. As a system grows, processing resources can easily be shifted from one

3-Series processor to another without rewriting any code. To keep the system

running seamlessly, consider the following when stopping and starting programs.

To ensure that devices are registered by the correct programs, note that programs

restart in ascending order according to program slot when the device is rebooted or

when the PROGreset command is entered. Program 1 starts before Program 2, and

so on. Since most devices can only be registered by a single program, the first

program to try registering the device succeeds; subsequent attempts to register the

device fail. If Program 1 registers a device, then Program 2 is not able to register it.

NOTE: This does not apply when programs are stopped and started individually; for

example, if the programmer stops all programs and restarts Program 10 before

Program 1, Program 10 registers its devices first.

There are exceptions to this rule, as some devices, slots, and ports can be registered

by multiple programs. Refer to the following table to determine whether a particular

device, slot, or port is exclusive (can only be registered by one program) or shareable

(can be registered by multiple programs).

Device, Slot, and Port Shareability

DEVICE, SLOT, OR PORT

SHAREABLILITY

3-Series Ethernet card cages (e.g.,

CEN-CI3-1 and CEN-CI3-3)

Shareable

BACnet Exclusive

Built-in audio slot Shareable

Built-in COM ports

Slots are shareable but ports are exclusive;

e.g., Program 1 can register COM2 while

Program 5 registers COM1, but both

programs cannot register COM2 at the

same time

Built-in digital inputs Slots and ports are shareable

Built-in on screen display Shareable; however, each program must

define its own specific device ID as a

parameter on the symbol

Built-in relays

Slots and ports are shareable

Built-in RF gateway Slots are shareable but individual devices

are exclusive

Built-in system monitor Shareable

Built-in Versiports Slots are shareable; ports are shareable

only if they have the same configuration

Cresnet devices Exclusive

Intra-EISC devices Sharable; see “Intra-EISC (Ethernet

Intersystems Communications) Devices” on the

following page for more information

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