Run Multiple Programs - Crestron 3 Series Reference Manual

Run Multiple Programs

3-Series processors run multiple programs simultaneously to allow programmers
to independently develop and run device specific programs for AV, lighting,
HVAC, security, and so forth. As a system grows, processing resources can easily
be shifted from one 3-Series processor to another without rewriting any code.
Device Registration Considerations
To keep the system running seamlessly, consider the following when stopping and
starting programs:
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40 • 3-Series Control Systems
To ensure that devices are registered by the correct programs, note that
programs restart in ascending order by program slot when the device is
rebooted or when the PROGreset command is entered. For example,
Program 1 starts before Program 2.
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 behavior does not apply when programs are started and
stopped individually. For example, if the programmer stops all programs
and restarts Program 10 before Program 1, Program 10 registers the
device 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 control system slot or port is exclusive
(can only be registered by one program) or shareable (can be registered
by multiple programs).
3-Series Port and Slot Sharing
SLOT OR PORT
3-Series Ethernet card
cages
BACnet
Built-in audio slot
Built-in COM ports
Built-in digital inputs
Built-in on screen display
Built-in relays
Built-in RF gateway
Built-in system monitor
Built-in Versiports
STATUS
Sharable
Exclusive
Sharable
Slots are sharable but ports are exclusive (For example,
Program 1 can register COM 2 while Program 5 registers COM
1, but both programs cannot register COM 2 at the once.)
Slots and ports are sharable
Sharable, although each program must define its own specific
device ID as a parameter on the symbol
Slots and ports are sharable
Slots are sharable but individual devices are exclusive
Sharable
Slots are sharable, ports are sharable only if they have the
same configuration
Reference Guide – DOC. 7150B