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CAS300 commands

With CAS300, used by Classpad 300 / 330 (+) models, the 0x01 – Command packet inner payload (P field) is expected to be at least 4 bytes long, and starts with the following:

Offset	Size	Field name	Description	Values
0 (0x00)	4 B	Command (CMD)	Identifier of the command to be run.	4-char ASCII-HEX value.

0000 “Start data transfer”

No payload. Followed by data packets once acknowledged.

0001 “End data transfer”

No payload. Sent after data packets have been sent and acknowledged.

0002 “Send device information”

Sent by the device when requested using 0011 “Request device information”. Payload is the following:

Offset	Size	Field name	Description	Values
4 (0x04)	49 B	Device information		See structure below.

Device information has the following structure:

Offset	Size	Field name	Description	Values
0 (0x00)	8 B	Model		0xFF-terminated string, e.g. CP430\xFF\xFF\xFF.
8 (0x08)	16 B	OS version		0xFF-terminated string, e.g. 00.00.0(03050000.
24 (0x18)	8 B	Bootcode version (?)		0xFF-terminated string, e.g. 01.01.00.
32 (0x20)	8 B	Flash ROM size		0xFF-terminated string, e.g. 16M\xFF\xFF\xFF\xFF\xFF.
40 (0x28)	8 B	Size (?)		0xFF-terminated string, e.g. 8M\xFF\xFF\xFF\xFF\xFF\xFF.
48 (0x30)	1 B	?		0x83

0003 “Update link settings”

Todo

This command has been found to sometimes bear a 2-char ASCII-HEX value, and sometimes a 1-byte value directly. On serial links, it seems to set up some kind of link update, that either sets up obfuscation, or updates link settings, or both.

It has not yet been found what the role of this command is exactly.

000C “Send file”

Offset	Size	Field name	Description	Values
4 (0x04)	4 B	File size		Big endian 32-bit integer.
8 (0x08)	4 B	?		?, e.g. 0x624e461b if it is a 32-bit big endian value
12 (0x0C)	Variable	Path to the file		Non-terminated string, e.g. main.ACT\eActivity Save.EAC.

000D “Request file”

Offset	Size	Field name	Description	Values
4 (0x04)	1 B	Type		Known values: 0x0B: file.
5 (0x05)	Variable	Path		File to request.

000E “Request file list”

Offset	Size	Field name	Description	Values
4 (0x04)	1 B	Type		Known values: 0x00: Root. 0x08: E-Act or file.
5 (0x05)	Variable	Path		File path (may be empty)

000F “Transfer file list”

Followed by 0000 “Start data transfer”, then data packets containing the listing.

Offset	Size	Field name	Description	Values
4 (0x04)	4 B	Listing size.		Big endian 32-bit integer, e.g. 0x000000EB.

0010 ?

Offset	Size	Field name	Description	Values
4 (0x04)	2 B	?		\0\0 or \1\0

0011 “Request device information”

No payload. Answered by a 0002 “Send device information”.

Warning

If used twice in a given session, the calculator will answer with a terminate packet instead of the device information.