requesttype=0x1b

This command will normally be issued immediately before a "release shutter" command, unlike the non-EOS lock keys command, which is issued at camera initialization. This late locking is so that the EOS camera can still be operated directly, even when connected to the USB port. The PowerShot cameras don't have this capability, so they can (should) be locked as soon as the USB connection is made.

Command: 0x54 bytes

0000 14 00 00 00 01 02 00 00 00 00 00 00 00 00 00 00 ................
0010 00 00 00 00 0a 00 00 00 30 00 00 00 00 03 01 00 ........0.......
0020 00 00 00 00 01 01 00 ff 03 ff 01 30 06 ff 01 ff ...........0....
0030 00 00 00 7f 10 00 48 00 ff ff ff ff 18 c8 18 ff ......H.........
0040 02 00 00 00 1b 00 00 12 14 00 00 00 a4 f6 12 00 ................
0050 06 00 00 00                                     ....
      

Response: 0x54 bytes

0000 00 00 00 00 01 03 00 00 00 00 00 00 00 00 00 00 ................
0010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0000 02 00 00 00 1b 00 00 22 14 00 00 00 a4 f6 12 00 ......."........
0010 00 00 00 00                                     ....
      

Status codes: