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From: http://vyskocil.free.fr/coolcom/MC-EU1%20Protocol.txt
Coolpix MC-EU1 Protocol
Here are some informations about the serial protocol used between the Coolpix and the MC-EU1 remote.
Speed is set to 19200 bauds
* Introduction
This protocol use 1 or 4 bytes "packets". 4 bytes packets are used to send command to the coolpix and receive information from it.
1 byte packet are used as acknowledge (0x86), not acknowledge (0x15), "attention packet" (0xFF).
Each byte in these packet is divided in two part, bit 0-6 is the value on 7 bits and bit 7 is the odd parity bit (thanks Mark Roberts !)
Returned value by the coolpix (in the two or three? last byte) have 0x1C offset, and least signifiant byte is sent first, for example
the number of picture is :
nb picture = ((byte[2] & 0x7F) - 0x1C) + 100 * ((byte[3] & 0x7F) - 0x1C)
byte[0] == 0x9B, byte[1] == 0x10
* Going to MC-EU1 protocol
Send Receive Informations
0x00
0x15
0x1B,0x53,0x06,0x00,0x00,0x11,0x02,0x00,0x00,0x00,0x13,0x00 Standard SetSpeed to 19200 command packet
0x06
0x1B,0x53,0x06,0x00,0x00,0x11,0x02,0x00,0x00,0x10,0x23,0x00 Go to MC-EU1 protocol packet, switch LCD ON
0x06
At first connection after Coolpix has been powerup, first 0x00 don't work, coolpix respond 0xFF 0xFF then nothing
A second 0x00 do the job.
* Initialisations
Need more informations...
Send Receive Informations
0x9B, 0x85, 0x1C, 0x1C
0x9B, 0x13, 0x1C, 0x1C ?
0x86
* Has camera power down ?
Send Receive Informations
0x9B, 0x08, 0x1C, 0x1C
0x9B, 0x92, 0x7F, 0x7F Coolpix is ON
or
0x9B, 0x19, 0x7F, 0x7F Coolpix powerdown.
0x86
* Take a shoot :
Send Receive Informations
0x9B, 0x01, 0x1C, 0x1C Half press the shutter button.
0x86
0x9B, 0x01, 0x7F, 0x1C Full press the shutter button,
take the picture
0x86
0x9B, 0x01, 0x7F, 0x7F Release the shutter button,
usefull in bulb mode
0x8F
0x9B, 0x01, 0x1C, 0x7F Half press release (unlock shutter button).
0x86
* Zoom IN
Send Receive Informations
0x9B, 0x02, 0x1C, 0x1C "Press" the zoom in button
0x86
0x9B, 0x02, 0x1C, 0x7F "Release" the zoom in button
0x86
* Zoom OUT
Send Receive Informations
0x9B, 0x02, 0x7F, 0x1C "Press" the zoom out button
0x86
0x9B, 0x02, 0x7F, 0x7F "Release" the zoom out button
0x86
* Next picture
Send Receive Informations
0x9B, 0x04, 0x1C, 0x1C "Press" right
0x86
0x9B, 0x04, 0x1C, 0x7F "Release" right
0x86
* Previous picture
Send Receive Informations
0x9B, 0x04, 0x7F, 0x1C "Press" left
0x86
0x9B, 0x04, 0x7F, 0x7F "Release" left
0x86
* Number of picture left
Send Receive Informations
0x9B, 0x07, 0x1C, 0x1C
0x9B, 0x10, 0xXX, 0xYY (0xXX & 0x7F) - 0x1C + 100 * ((0xYY & 0x7F) - 0x1C)
is the number of pictures left
0x86
* A-REC/M-Rec
Send Receive Informations
0x9B, 0x89, 0x1C, 0x1C
0x9B, 0x91, 0x9D, 0x7F for A Rec mode
or
0x9B, 0x91, 0x0D, 0x1C for M Rec mode
or
0x9B, 0x91, 0x7F, 0x9D for play mode
0x86
* Go back to standard protocol
Send Receive Informations
0x9B, 0x8A, 0x1C, 0x1C LCD OFF
0x86
* "Attention" packet 0xFF from coolpix
Coolpix send 0xFF in many cases :
- After initialisation in response to 0x00.
- When Coolpix self powerdown (powersave)
- When Coolpix is powerdown
- When a picture has been recorded
- When mode selector is operated (A-Rec, M-Rec, Play)
It's a good idea to send 0x9B, 0x08, 0x1C, 0x1C packet to check
if coolpix has powerdown when a 0xFF is received, else check the
picture number and current mode.
* Notes
- Camera send NAK (0x15) in response to bad command packet
- You may send any useful informations about this protocol to : vladimir.vyskocil@wanadoo.fr
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