Projector Control
5 COMMAND RETURN CODES
The Serial protocol returns an acknowledgment (“return code”) for every packet sent. If
the host sends a packet, then the projector acknowledge the receipt of this packet. The return codes are detailed in the table below.
Command Return Code Name | Return Code Value | Description |
ACK | 0x06 | Packet acknowledged – no errors. Normal |
|
| response when receiving |
NAK | 0x15 | Packet not acknowledged – some error occurred in |
|
| receiving this packet. Usually |
|
| Indicates a CRC error. |
ERR | 0x1C 0xXXXX | Packet was received OK, but an error occurred |
|
| when executing the command contained in the |
|
| Packet. The two bytes following the 0x1C |
|
| (0xXXXX) are the error code |
VAL | 0x1D 0xXX 0xYY | Packet value returned. This return code will be |
|
| sent in response to a Operation packet of type |
|
| OPERATION_GET. The first byte after 0x1D |
|
| (0xXX), is the |
|
| 0xYY is the most |
|
| value. |
STRING | Strings 0x06 | ASCII Strings and at last ACK |
Table 8
TRANSACTION EXAMPLES
Example 1: Set
Host:Projector Operation Set Packet =>
<= ACK
Example 2: Get
Operation Get Packet =>
<= VAL
VAL=0x1D 0x00 0x03 means that 0x0300 is returned
Example 3: Hex sequence for Set Brightness to 70% => 0.7*255 = 178 = 0xB2
Host:
0xBE 0xEF 0x80 0x06 0x00 0x2E 0x04 0x01 0x00 0x11 0x00 0xB2 0x00
Magic number Body size | CRC | Op.type Function | Value |
7byte Message Head |
| 6byte Message Body | |
Projector:
0x06
Example 4: Hex sequence for power on (with CRC deactivated)
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