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Audio interference from serial commands...
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| Topic: | Audio interference from serial commands using MSC400i This thread has 23 replies. Displaying posts 1 through 15. |
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| Post 1 made on Thursday January 12, 2012 at 06:54 |
banty007 Long Time Member |
Joined:
Posts: | January 2012
24 |
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Hi me again,
I am experiencing a strange chripping noise when any serial command is sent to the projector.
The setup is:
Sanyo PLC-XU106 projector (being controlled via serial on port 7)
TOA A2030 (No control)
We have 3 audio sources (DVD,PC and Laptop) all inputting into the projector and the output to the AMP.
For some reason when ever we send a serial command to the projector we get a chrip noise through the speakers.
Any ideas........
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| Post 2 made on Thursday January 12, 2012 at 11:09 |
Duct Tape Loyal Member |
Joined:
Posts: | November 2008
5,298 |
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what if you plug in your laptop to the port to send the serial command?
try it with the laptop charger unplugged first, then plugged into the same power outlet as the msc400. does this make any difference?
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| Post 3 made on Thursday January 12, 2012 at 12:13 |
tweeterguy Loyal Member |
Joined:
Posts: | June 2005
7,713 |
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I've heard that noise on 2 separate MSC-400s in different homes; one was using standard 418 and the other was an i version. The noise occurred with IR commands and 232 commands, it's a digital noise relating to the antenna (I believe) and is most noticeable while issuing a trigger command during the macro process and volume up/down ramps. Relocating the antenna, using STP, rerouting IR cables, rerouting interconnects and power did not solve it. Putting a CP2e and gateway in solved it :-) I'd love to hear if/how you resolve this, for curiosity sake. FWIW I've never heard this noise with an MRF-300/350, just the MSC.
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| OP | Post 4 made on Friday January 13, 2012 at 07:16 |
banty007 Long Time Member |
Joined:
Posts: | January 2012
24 |
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On January 12, 2012 at 11:09, Duct Tape said...
what if you plug in your laptop to the port to send the serial command?
try it with the laptop charger unplugged first, then plugged into the same power outlet as the msc400. does this make any difference? Hi Duct Tried this and the noise goes.... Def a MSC related problem.
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| OP | Post 5 made on Friday January 13, 2012 at 07:17 |
banty007 Long Time Member |
Joined:
Posts: | January 2012
24 |
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On January 12, 2012 at 12:13, tweeterguy said...
I've heard that noise on 2 separate MSC-400s in different homes; one was using standard 418 and the other was an i version. The noise occurred with IR commands and 232 commands, it's a digital noise relating to the antenna (I believe) and is most noticeable while issuing a trigger command during the macro process and volume up/down ramps. Relocating the antenna, using STP, rerouting IR cables, rerouting interconnects and power did not solve it. Putting a CP2e and gateway in solved it :-) I'd love to hear if/how you resolve this, for curiosity sake. FWIW I've never heard this noise with an MRF-300/350, just the MSC. Hi Tweeterguy What is a CP2e?
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| Post 6 made on Friday January 13, 2012 at 08:20 |
Duct Tape Loyal Member |
Joined:
Posts: | November 2008
5,298 |
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On January 13, 2012 at 07:17, banty007 said...
Hi Tweeterguy
What is a CP2e? a crestron processor
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| OP | Post 7 made on Friday January 13, 2012 at 10:02 |
banty007 Long Time Member |
Joined:
Posts: | January 2012
24 |
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On January 13, 2012 at 08:20, Duct Tape said...
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a crestron processor oh dear.....
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| Post 8 made on Friday January 13, 2012 at 10:06 |
Duct Tape Loyal Member |
Joined:
Posts: | November 2008
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how is the msc400 wired? did you extend the serial cable? if so, how did you extend it? premade cable or one you built yourself?
i've done many msc400 installs and haven't had this issue.
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| OP | Post 9 made on Friday January 13, 2012 at 10:16 |
banty007 Long Time Member |
Joined:
Posts: | January 2012
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On January 13, 2012 at 10:06, Duct Tape said...
how is the msc400 wired? did you extend the serial cable? if so, how did you extend it? premade cable or one you built yourself?
i've done many msc400 installs and haven't had this issue. Hi Duct tape This is a cable that we built ourselves using FTP shield cable the spec we used was 9 way 3.5mm 2 RED tip 3 BLACK Sleeve 5 Screen Shield
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| Post 10 made on Friday January 13, 2012 at 10:37 |
Duct Tape Loyal Member |
Joined:
Posts: | November 2008
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so you didn't use the URC serial cable at all? the 1/8" connector on the URC cable actually has 4 connection points. like this:  I wonder if the connector you are using is causing the issue. I would try making up a db9 to db9 cable and use the URC serial cable with that.
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| OP | Post 11 made on Friday January 13, 2012 at 10:55 |
banty007 Long Time Member |
Joined:
Posts: | January 2012
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On January 13, 2012 at 10:37, Duct Tape said...
so you didn't use the URC serial cable at all? the 1/8" connector on the URC cable actually has 4 connection points. like this: I wonder if the connector you are using is causing the issue. I would try making up a db9 to db9 cable and use the URC serial cable with that. Do you have the spec for that cable? Did you get your cookie?
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| Post 12 made on Friday January 13, 2012 at 11:38 |
Duct Tape Loyal Member |
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Posts: | November 2008
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my wife baked some cookies last night :) i just metered out a urc male rs232 cable looking at the photo above from left to right far left = pin 5 2nd from far left = pin 2 3rd from far left = pin 3 far right/tip = no connection essentially, by not using the proper connector, you are shorting out your pin 2 to pin 5. one thing you might be able to try, is to disconnect pin 2. what is probably happening, is the feedback coming from the projector is shorting out to pin 5, thus causing your noise. personally, i would just pick up a urc cable and connect to that.
Last edited by Duct Tape on January 13, 2012 11:47.
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| Post 13 made on Friday January 13, 2012 at 13:06 |
kgossen Super Member |
Joined:
Posts: | March 2008
3,026 |
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Page 77 of the programming manual for the MSC-400 shows the pin out connections for serial.
What is a 9 way 3.5mm???
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"Quality isn't expensive, it's Priceless!" |
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| Post 14 made on Friday January 13, 2012 at 13:41 |
Duct Tape Loyal Member |
Joined:
Posts: | November 2008
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On January 13, 2012 at 13:06, kgossen said...
Page 77 of the programming manual for the MSC-400 shows the pin out connections for serial.
What is a 9 way 3.5mm??? ??? the only thing with 9 pins I was referring to was a DB9 connector.
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| Post 15 made on Friday January 13, 2012 at 13:49 |
kgossen Super Member |
Joined:
Posts: | March 2008
3,026 |
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On January 13, 2012 at 10:16, banty007 said...
Hi Duct tape
This is a cable that we built ourselves using FTP shield cable the spec we used was
9 way 3.5mm
2 RED tip
3 BLACK Sleeve
5 Screen Shield
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"Quality isn't expensive, it's Priceless!" |
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