So if it specifieis [cr] for carriage return, when creating the serial string, do I just put "cr"?

For example:

Making a zone the active control zone - selects the zone to receive commands
Syntax: znc,4,[zone #][cr]

where
znc, indicates the command type (zone command)
4, indicates an active zone change
[zone #] is the number of the zone to become active(1-18)
[cr] is a carriage return

Sample:
Command: znc,4,2[cr]
(make zone 2 the active zone)

Do i put "[cr]" or does the control system specify what the carriage return is?