JP1 Remotes

[classicsat]

I mean really old, from about 1985 earlier.

I have a piece of equipment (a Uniden UST-710 satellite dish mover if that matters) I am considering repurposing the IR circuitry for an A/V switcher. This device is unique in that there is a companion chip to the one in the remote in the receiver that provides a 6 bit pattern to the CPU in the unit.

The remote has a Mitstubishi M50115 remote encoder, and the receiver has the companion M50117 decoder. I cannot find datasheets on these chips.

I would like to make an upgrade for my JP1 remote (probably the 6800)

When I learned it, it says the protocol is ID-000D, Device 2, no sub device, and then the OBC/HEX/EFC for the key.

The frequency is 38095

The learned keys are:

Power; OBC 65, Hex BE, EFC 191
+288 -764 +288 -1816 +288 -764 +288 -1816 +288 -764 +288 -764 +288 -764 +288 -764 +288 -764 +288 -1816 +288 -11282

West, OBC 70, Hex CE, EFC 060

+288 -764 +288 -1814 +288 -764 +288 -764 +288 -1814 +288 -1814 +288 -764 +288 -764 +288 -764 +288 -1814 +288 -10230

East OBC 75, Hex 96, EFC 126

+286 -766 +286 -1818 +286 -766 +286 -1818 +286 -1818 +286 -766 +286 -1818 +286 -766 +286 -766 +286 -1818 +286 -9188


The absolute last resort I guess would be to learn the remote and some new keys I will be adding, if not using a micro and using a protocol I can write simple code to decode, and that the JP1 remote does have.

[johnsfine]

In KM and RM that protocol is named Akai. I don't remember why that naming isn't consistent in DecodeIR (usually a name like ID-000D in DecodeIR means the protocol isn't named in KM or RM).

I hope the device number to fixed data and OBC to EFC translations are the same in KM and RM as in DecodeIR so you could directly use the numbers from those decodes, but I'm not certain of that (since I don't remember where we've see this before).

[johnsfine]

I just did a minimal investigation and the translation is NOT consistent. I think KM and RM are the same on this, but don't match the decodes.

I think telling KM or RM a device of 1 will match the decoded device 2, and using the EFC from the decode will get the right function (the OBC won't).

[classicsat]

That works, thanks.

[classicsat]

For those that care, I hoodked the decoder chip to my other computer , and with a Qbasic program that reads that chip through the parallel port, and with an test LED, I found the chip is actually a 7 bit chip, with a received signal line (the MCU in the conrol box uses only 5 plus the RS line), and how the output of the chip directly equates bits in a an OBC, and to that an EFC with a lookup table made from OBC-to-EFC.xls
With the RS as bit 7, and bits 6 to 0, the binary output equals the OBC.

Now (for the fun of it I suppose), to find out how the remote matrix on the OEM remote equates OBC codes.

[The Robman]

Hey Cat,
Just in case anyone else comes along with the same old sat dish, could you create an upgrade file for this and post it in the Sat folder.
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!