I am having a problem with a certain aspect of controlling my Marantz SR5500 via RS232, namely I can't get it to control any of the multi-speaker functions. Everything else is working fine via RS232 and I have full and correct feedback.

Note that I have checked the serial protocols for many of the later receiver and from what I can see they are identical, so anyone with any relevant feedback based on newer models, please feel free to chip in!

The interesting thing about this case is that I can control all the multi speaker functions just fine using IR, so I know my setup is correct (ie not in Economy mode and Surround Rear speakers set to "Off" - all correct there) and the rest of the RS232 commands, as I said, work great.

When I submit a multi speaker command (cannot remember the exact command, but it's correct!) I get a response of "15" which is a "Command NAK"

Does anyone have any light to shed on this? It's really annoying!

Marc

Maybe, you can post your code..

Reason why is because there are several protcols used.
Renember there are also 2 codes, one to put the speaker on/off and also one to put the amp zone 2 on/off

Thanks for the response.

The codes I am using are from a Crestron module posted on the Creston "Partner Modules" page. You are totally correct that there is a set of commands for the Multi Room stuff, which used the dedicated outputs and an external amp, which I don't need, and a set for the MultiSpeaker mode, using the Surround Back speaker terminals, which is what I am trying to use.

MultiRoom On for example, is :

@MPW:2,\x0D - which works

MultiSpeakerOn is :

@MSP:2,\x0D - which doesn't

In fact all the commands work except the MultiSpeaker ones, which get a feedback of:

@\x15\x0D

Any ideas?

it is REALLY odd that the IR commands work but still there is no serial feedback. I have a similar instance where I can't control a DenonDVD player properly via serial, but I send IR command to it and get feedback via serial, happy days (I have a cable problem I can be bothered fixing, as it works well this way). It seems that the MultiSpeaker serial commands are somehow disabled in the firmware. Can this be the case?

Has anyone had any luck with the SR5500 or later models? The protocol looks the same even on the latest models.

Help!
Marc