Components
Description
The subcode is represented by a four-character ASCII code (A-Z, upper or lower
case, and 0-9). This subcode appears immediately after the function code, with a
plus sign (+) character to separate the function code and subcode. If no subcode
exists, the plus sign (+) is also omitted. In messages sent to Christie that
have a subcode, a space between the subcode and the first parameter (or special
character) is optional.
Request/reply symbols
If the controller is requesting information from Christie , a question mark (?)
appears directly after the function code. If Christie is replying, an
exclamation mark (!) appears directly after the function code. For set messages to
Christie , neither of these characters appear—data directly follows the
function code and subcode.
A request for information is represented by a question mark (?) that appears directly
after the function code. A reply is represented by an exclamation mark (!) that
appears directly after the function code or subcode, if one is provided. The first
parameter located after the exclamation mark (!) reply character cannot have a
space, for example (PWR!000).
Data
The value for a given Christie state, such as on or off, appears in ASCII-
decimal format directly after the request/reply symbol. You can add an optional
space after the symbol—such as before the data—in a set message, but data in
replies follow the exclamation mark (!) symbol without a space. Other details to
remember about data:
• All values returned by Christie (reply messages) have a fixed length,
regardless of the actual value. For a specific parameter, the length is always the
same (for example, contrast is always returned as three characters, Christie
number is always returned as five characters). The minimum
parameter size is three characters. Values less than the predefined size are
padded with leading zeros as needed. Parameters which have negative signs are
zero padded after the negative sign, and have one less digit to make space for
the sign.
• Data in set messages to Christie do not require padding with zeros.
• Within each message, multiple parameters of data must be separated by one
space character.
• Text parameters such as channel names are enclosed in double quotes following
the data, as in Name.
Text parameters
Most data is simply a numerical value; however, some messages also require text.
For example, a channel naming message typically includes a text-based name—
enclose this text in double quotation marks, as in "Tilt the Wagon". Use all
characters as required except for special characters—these require a two-character
combination.
Related information
Special characters for text (on page 11)
Maximizing message integrity (on page 13)
Communicating with Christie
Christie Technical Reference–Serial Commands
10
020-103316-07 Rev. 1 (09-2022)
Copyright
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2022 Christie Digital Systems USA, Inc. All rights reserved.
If printed, please recycle this document after use.
