BCD rotary, for FSBUS

[fmw]

Hi

I can see on the forum, that many is using Knitter, for the BCD switsch.

Can anybody give me the type number of the Knitter BCD switsch that is best to use.

Regards

Finn
Denmark

[Mathew]

Hi Finn,

do you mean the Knitter rotary ???

That is the MRP1-20...

Mathias

[fmw]

Hi Mathias

Just what i need.

Thanks.

Regards

Finn

[tuomas]

I think BCD rotaries work too. Are there any special requirements, does it need to be BCD or HEX code, there are different ones..? How does one wire a BCD switch? As type1 rotary?

Some of those BCD switches are pretty small and thin, so it makes an appealing choice for gauge knobs that one can just glue/attach on top of the instrument panel that has a TFT behind.

Tuomas

[Pantu]

Hi all,

here´s probably some slight misunderstanding: the MRP series from Knitter are not BCD coded. They are plain rotary pulse switches (Miniature Rotary Pulse = MRP)with 24 pulses / rev.

BCD coded Switches are used to set the values from 1 to F (=1 to 16)
There are BCD coded thumbwheel switches available with engraved numbers on the wheel. They are very fine for setting the transponder code or the radio frequency, but cannot be used as "Rotaries".

Just my 2 cts

Best regards

Peter

[fmw]

Hi Peter

So far i understand, the BCD must have 16 position.

Do you now how to connect to the FSKEY.

Regards
Finn

[fmw]

Hi Again

Must that be binary coded hexadecimal??

Regards

Finn

[Pantu]

Hi Finn,

the BCD coded switch can have max 16 positions, but could well be 10 only. (0 to 9).
The switch has 4 pins plus common and is BCD coded (1, 2, 4, 8 ) in itself The numbers on the switch are generally in dec.

In FSBus you just tell that it´s a BCD switch and the software will decode the BCD coded signal to dec.

Eg: 1 Dec = switch representing the 1 is closed (all others open)
2 " = " 2 " "
3 " = " 1 and 2 " "
4 " = " 4 " "
5 " = " 1 and 4 " "
6 = 4 and 2
7 = 1 and 2 and 4
8 = 8
9 = 1 and 8
10 (A) = 2 and 8
B = 1 and 2 and 8

And so on until 1and 2 and 4 and 8 = 16 dec = F hex

Hope this helps.

Best regards


Peter

[fmw]

Hi Peter

Thanks again.

But to be sure, are you then connect the BCD like 4 switsches to the FSKEY?

Sorry about all my questions

regards
Finn

[Pantu]

Hi,

yes, the BCD switch is considered as 4 individual switches connected to FSKey. May be that there is a limitation that you may not mix rotaries and "normal" switches within 1 row. If I recall it correctly there was no such limitation in the 1.x FSBus version. For FSBus 2.02 I can´t tell for sure as I haven´t tried it yet.

But why not trying it out. Can´t damage any thing though.

Hope I could help.

Best regards


Peter