Error Messages; Descriptive Error - Christie Boxer 4K Technical Reference

Message Description
requirement
This is a quick way to confirm success with set messages and is useful with long distance
communication links or where the projectors and/or images are not visible from the
controller. Acknowledgments can also be a type of flow control.
Checksums For maximum message integrity, add a checksum character ampersand (&) just after the
start code bracket. You must also include the correct checksum total (0-255) just before
the end code bracket. Make sure to add a space before the calculated checksum to
separate it from the last data parameter:
The checksum is the low byte of the sum of the ASCII values of all characters between the
start bracket and the beginning of the checksum, but not including either. It does include
the space in front of the checksum.
Calculate the checksum for the above set contrast to 64 command as follows:
CHECKSUM EXAMPLE = & + c + o + n + 6 + 4 + 'space'
Boxer 4K collects all of the message bytes as defined in the first byte of the message, then
creates its own checksum value for comparison with the checksum included in the
controller's message. If the values match, the message is considered to have been
correctly received; otherwise, the message is discarded.
Note the following:

Error messages

If a command cannot be performed, a descriptive error identifying the problem appears.
For example, the following message indicates a syntax error:
(ITP) - (65535 00000 ERR00005 "ITP: Too Few Parameters")

Descriptive error

The following error codes indicate a problem if a command cannot be performed.
Error code Description
3 Invalid parameter
4 Too many parameters
5 Too few parameters
Boxer 4K Serial API Commands Technical Reference
020-101697-05 Rev. 1 (07-2017)
Copyright 2017 Christie Digital Systems USA Inc. All rights reserved.
©
• Full Acknowledgments—Insert a hash (#) character just after the start code bracket.
This returns the message sent, as a reply.
= 26h+63h +6Fh +6E h +36h +$34h +$20h
= 01F0h
= F0h when only the low byte is used
= 240
• h indicates a hex number.
• If a request message has a checksum, so does the reply.
• If using both acknowledge and checksum, either character can occur first.
Communicating with Boxer 4K
Error code Description
105 Disabled control
106 Invalid language
107 Exceeded list size
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