Device/Protocol Info for Emerson MS7775 CD player

[ti83programmer]

I have an 8811 and the above CD player, but I don't have the original remote, so I have no way to learn the protocol. If you know some other way I can get it, please let me know. If anyone has this device, PLEASE tell me the protocol info for it, I'm desperate, even if it's just a possible solution.

[Nils_Ekberg]

I have an 8811 and the above CD player, but I don't have the original remote, so I have no way to learn the protocol. If you know some other way I can get it, please let me know. If anyone has this device, PLEASE tell me the protocol info for it, I'm desperate, even if it's just a possible solution.

Try the built in code 0305 it is suppossed to be for an Emerson CD player.

[ti83programmer]

I neglected to mention that none of the built-in setup codes for the CD device, or frankly any Emerson device code, do not work.

[jon_armstrong]

Did ANY CD_0305 commands work? In searching for this unit it looks like a mini system:

“Product Description
Audio Compact MiniSystem / 3 CD Changer / Dual Cassette / AM and FM Radio / 2-Way Speaker / Remote Control”

So it may be something completely different than a CD

There is a LIRC file for an Emerson CD:

# contributed by Jason Gladen
#
# brand: Emerson
# model no. of remote control: 790-381701-01
# devices being controlled by this remote: CD (single disc)
#

begin remote

name emerson-cd
bits 8
flags SPACE_ENC|CONST_LENGTH
eps 30
aeps 100

one 1451 236
zero 564 1118
ptrail 564
pre_data_bits 3
pre_data 0x6
gap 54006
repeat_bit 0

begin codes
power 0x0000000000000048
play/pause 0x0000000000000042
stop/clear 0x0000000000000044
mute 0x0000000000000050
volume_down 0x0000000000000081
volume_up 0x0000000000000082
end codes

end remote

My guess is that this is the F12 protocol. The ptrail is really a Zero bit plus a gap.

John if you are reading this you have F12 in your ReadMe_DecodeIR.txt as F12:

{410}<1,-3|3,-1>(D:3,C:1,F:8,1,-80)+

However, my previous decodes were {410}<1,-3|3,-1>(D:3,C:1,F:8,^129) twice if C=0 and repeating if C=1. I just decoded CD_0469 and it decodes correctly but I manually decoded it and there is NO final On pulse. Or said another way there are a total of 24 burst pairs for the command and one repeat. So, I think DecodeIR.dll is decoding correctly but the documentation is slightly in error. This is pivotal to my decoding of the LIRC file and where the twelfth bit comes from:

Here are the commands in order:

110 01001000 0 => 110 0 10010000 Device=003 OBC=009
110 01000010 0 => 110 0 10000100 Device=003 OBC=033
110 01000100 0 => 110 0 10001000 Device=003 OBC=017
110 01010000 0 => 110 0 10100000 Device=003 OBC=005
110 10000001 0 => 110 1 00000010 Device=003 OBC=064
110 10000010 0 => 110 1 00000100 Device=003 OBC=032

The first three bits are “pre_data 0x6” then the 8-bits and lastly the implied zero bit at the end. I then rearranged them to F:3, C:1, F:8


There are/were three other CD's that were under the Emerson brand that had setup codes but not in the 8811:

CD_0155 (NEC1:88 and OBC 020 is play)
CD_0164 (NEC2:128.124 and OBC 006 is play)
CD_0469 (F12:5 and OBC 018 is play)

So there you have a lot of possibilities and yet I am not necessarily confident that any will work. The only way is to test. Hopefully, some one else has the answer for sure.

[Nils_Ekberg]

It may be worthwhile trying Curtis Mathis, Scott and Goldstar codes. Secondly, have you tried manually scanning ALL CD and Audio device codes?

Hopefully someone else has an Emerson CD and can do a learn to get the protocol for you. From there we can get a shot at the EFC's

[jamesgammel]

CD players are fast becoming articles from the past. Most dvd players now in vogue will also play cd's. SO, checking my 2104 manual (also almost a relic), they list the following setup codes for Emerson CD's: 0305, 0155, 0164, and 0469. If your remote doesn't have all of these native, I'm sure someone can create and post an upgrade replicating it.

My C6 manual only listed the 0305 for Emerson CD's.

Jim

[ti83programmer]

As Jon Armstrong said, the last three codes (155, 164, and 469) aren't accepted by my 8811. So, can anyone out there please post some upgrades of these that I can test? Thank you.

[jamesgammel]

If you can wait a little, I'll try and make a mini-upgrade for each you can use to test and narrow down if one will work. If one does, it'd be easy enough to make a complete one. Maybe I'll get a chance tomorrow morning.

Jim

[ti83programmer]

Don't bother, I looked in the Devices4.xls spreadsheet and the info in there is what you guys have been saying. I made my own upgrades with all three codes and none of them work. Does anyone have any new suggestions?

[johnsfine]

John if you are reading this you have F12 in your ReadMe_DecodeIR.txt as F12:

{410}<1,-3|3,-1>(D:3,C:1,F:8,1,-80)+

However, my previous decodes were {410}<1,-3|3,-1>(D:3,C:1,F:8,^129)

I just corrected (but probably won't upload just for this) both the comments in the C++ code and the ReadMe, because I agree that the actual decoding matches your version, not mine.

[ti83programmer]

If anyone cares, I ordered the original remote off eBay and finally found the protocol information:
It uses protocol ID 5A and the fixed data is 30 DA DA.
For some reason, I'm having trouble with KM on this computer but if I get it fixed I'll make a device upgrade and upload it.