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Rx !!!!!!!!!!!

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Trevor Grace 126/07/2020 11:28:37
51 forum posts

what is forwards or backwards compatible as in receivers !!!!!!!!!!!!!!

Martin Harris26/07/2020 11:58:04
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9534 forum posts
258 photos

2.4GHz or 35MHz?

Manufacturer?

We can't answer without some more info...

simon barr26/07/2020 12:16:53
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1062 forum posts
16 photos

You can get forward and reverse speed controllers.... is this what you mean?

Martin Harris26/07/2020 12:17:38
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9534 forum posts
258 photos

...or is it a general enquiry about the terminology? If so, backward compatibility means that an older receiver will still work with a newer version (or software release) of the transmitter.

Forward compatibility? Seems a slightly nebulous term but it probably refers to a manufacturer's philosophy for forthcoming products...

Trevor Grace 126/07/2020 12:31:43
51 forum posts

I have seen this term when looking for DSM2 Rx as opposed to DSMX.

Denis Watkins26/07/2020 12:32:29
4649 forum posts
131 photos

Looking back, Trevor has a DX7 DSM2 Transmitter

But this will not bind with NEW DSMX receivers

Though a New DSMX transmitter can sometimes bind with a DSM2 receiver.

Am second guessing the problem is something to do with this

The DX7 is compatible with DSM2

Some DX6i Tx will bind with either old DSM2 and new DSMX Receivers

Edited By Denis Watkins on 26/07/2020 12:35:32

Trevor Grace 126/07/2020 12:40:16
51 forum posts

well done that man (Denis W.)

Major prob trying to find DSM2 Rx.

kc26/07/2020 12:51:26
6709 forum posts
173 photos

Is that correct Denis? The way I read the Spektrum Rx manuals is that all DSMX RX are compatible with DSM2 Tx. So surely any DSMX Rx will works and you dont need to find a DSM2 Rx. Or am I wrong?

Edited By kc on 26/07/2020 12:52:46

Paul Marsh26/07/2020 12:57:49
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4102 forum posts
1234 photos

New radios don't do the dsm2 protocol, so a new radio won't work on dsm2 rx's, but a old radio will work on dsm-x rx's as the rx will roll back to dsm2.

Brian Cooper26/07/2020 13:15:35
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602 forum posts
27 photos

Whilst it is perfectly feasible for a Rx to be backwards compatible -- the technology has already existed, and DSM2/ DSMX is a prime example of this --- it is not possible to "future proof" a product when the future technology has not yet evolved or been invented.

Denis Watkins26/07/2020 13:37:45
4649 forum posts
131 photos

Have lost track with the comments

But the Orange and Lemon DSM2 from Inwoods and RapidRC will work

Trevor Grace 126/07/2020 14:08:41
51 forum posts

so can i safely use DSM2/DSMX and also DSMX/DSM2 with my old DX7 tranny.

Denis Watkins26/07/2020 14:12:46
4649 forum posts
131 photos

Any that will bind, and range test correctly, and set to failsafe, are safe to use

In an earlier post Trevor, you stated that your DX7 was DSM2.

Early DX was DSM2

Today the protocol is DSMX

John Lee26/07/2020 14:20:28
804 forum posts
93 photos

Just check the manual of the receiver you are interested in. They are all available on the Spektrum website & you will find a compatibility paragraph such as:

'The Spektrum AR620 receiver is a full range telemetry receiver featuring DSM® technology and is compatible with all Spektrum and JR® aircraft radios that support DSM2® and DSMX® technology.'

so in this case the answer to you last question is 'yes' for this receiver (AR620)

Simon Chaddock26/07/2020 14:29:28
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5791 forum posts
3063 photos

As Denis W points out Orange and Lemon do still make (or have in stock on their web site) DSM2 compatible receivers. These will work on any DSM2 Tx or a TX with both DSM2 & DSMX.

The backward compatibility between DSMX and DSM2 is due to the capability of the TX not the DSMX protocol.

Any DSMX Tx made in the last few years will not work with a DSM2 receiver.

Steve J26/07/2020 16:10:45
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2073 forum posts
60 photos

I just tried binding my '09 vintage DSX9 (22ms, 1024 bit DSM2) with an AR6260 bought in '14 and an AR8010T bought in '17. No problems with the 6260. After a few goes I managed to get solid orange LEDs on the 8010 and its remote, but there is no life on the outputs.

Denis Watkins26/07/2020 16:20:22
4649 forum posts
131 photos
Posted by Steve J on 26/07/2020 16:10:45:

I just tried binding my '09 vintage DSX9 (22ms, 1024 bit DSM2) with an AR6260 bought in '14 and an AR8010T bought in '17. No problems with the 6260. After a few goes I managed to get solid orange LEDs on the 8010 and its remote, but there is no life on the outputs.

Are the servos not 11 ms Steve, it just sticks in me head that we set 11ms

Steve J26/07/2020 16:27:21
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2073 forum posts
60 photos
Posted by Denis Watkins on 26/07/2020 16:20:22:
Posted by Steve J on 26/07/2020 16:10:45:

I just tried binding my '09 vintage DSX9 (22ms, 1024 bit DSM2) with an AR6260 bought in '14 and an AR8010T bought in '17.

Are the servos not 11 ms Steve, it just sticks in me head that we set 11ms

If I bound those receivers to my DX9, I would have the option of 22ms or 11ms on the outputs. There were 11ms DSM2 transmitters, but the DSX9 is not one of them.

PS Are you referring to the 8010T 11ms bug? With the firmware that my 8010T was shipped with it would only output 11ms on the outputs, this was fixed with a firmware update so it now does what it negotiates with the transmitter at bind.

Edited By Steve J on 26/07/2020 16:32:42

john davidson 127/07/2020 15:46:36
71 forum posts

re backwards compatibity dsm2 and dsmx . Reading my manual for dx6 (well it is a wet day) on page 20 under modulation quote "when dsmx is active , the transmitter operates in DMSX with DSMX receivers and DSM2 with DSM2 receivers. The transmitter automatically detects DSM2 or DSMX during binding and changes the mode automatically to match the receiver type you are using. if you select DSM2 , the transmitter operates in DSM2regardless whether it is bound to a DSm2 or DSMXreceiver"

I have never manage to bind a DSMX tranny to a DSM2 receiver , has frame rate on page 20any bearing on this?

Edited By john davidson 1 on 27/07/2020 15:47:35

Steve J27/07/2020 15:51:23
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2073 forum posts
60 photos
Posted by john davidson 1 on 27/07/2020 15:46:36:

I have never manage to bind a DSMX tranny to a DSM2 receiver

Post January 2015 EU Spektrum transmitters will not do DSM2 as DSM2 does not comply with EN 300 328 1.8.1.

My late '14 DX9 will bind to DSM2 and DSMX receivers (but sadly not to DSM Marine receivers).

Edited By Steve J on 27/07/2020 15:53:22

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