Other control for vision possible?

B

Brummkreisel

Enjoy sound of silence
After some trouble with my handset I thinking about fallback strategies.
One idea is to to split the cell signals and connect a Petrel as additional controller. Does anybody know whether this is a feasible idea and especially whether it is possible that a Petrel could take the lead replacing the vision as master.
This would help when a button on the vison handset is broken.
 
I don't see how it's feasible to have two controllers that don't talk to each other. They will both be trying to fire the solenoid.
 
Brummkreisel said:
After some trouble with my handset I thinking about fallback strategies.
One idea is to to split the cell signals and connect a Petrel as additional controller. Does anybody know whether this is a feasible idea and especially whether it is possible that a Petrel could take the lead replacing the vision as master.
This would help when a button on the vison handset is broken.
Click to expand...

How do you propose to wire in a solenoid?

Does the Petrel even have PO2 control?

I think simpler to get it fixed.

Matt.
 
Brummkreisel said:
Yepp, the version with fisher connector can be operated as primary or as redundant PO2 control.
Click to expand...

Really? I don't see it on the web-site: https://www.shearwater.com/products/petrel-2-fischer/

I thought rEvo/JJ etc. had controllers, but they were not sold to the public?

I may be wrong.

However, if you have a controller, how do you plan to fit a separate solenoid in the lid, drill a hole?

2 competing controllers sounds interesting, but would work if the second is set to the low SP during use and changed during incident to high SP.

Matt.
 
As I understand it, any Shearwater computer that is capable of being a controller is only available as a hardwired unit. No fischer cable controllers.
 
DSix36 said:
As I understand it, any Shearwater computer that is capable of being a controller is only available as a hardwired unit. No fischer cable controllers.
Click to expand...

Makes sense, given the extra wiring needed for solenoid etc.
 
The petrel can not be a controller in any version.
It is a part of the new canbus system and only a po2 display and dive computer.
 
Michael can you verify that please? As far as i know that is not possible but i would be very interested to know how sf have done that
 
matt said:
Really? I don't see it on the web-site: https://www.shearwater.com/products/petrel-2-fischer/

However, if you have a controller, how do you plan to fit a separate solenoid in the lid, drill a hole?

Matt.
Click to expand...

see on above mentioned page
"Rugged and Reliable

The Petrel 2 Fischer features all the modes of the Petrel 2 and incorporates a fischer connector for integration into rebreathers for primary or redundant PPO2 monitoring with full decompression."


I'M just in the beginning of my thougths and try to figure out what's possible. An additional solenoid is not in my mind. Starting at my problems I have been thinking about shutting down the vison and using the exisiting solenoid and batteries. Might be an stupid idea ...

Another option I do see right now is to use the Petrel for PPO2 monitoring and use the MAV to feed the loop. Not that convenient solution but better than leaving dive site w/o any dive.
 
I think.... They call it controller to keep the terminology the same as the earlier predator units, but with the move to Petrel, as I understand, the Petrel is the display and the buttons, but the actual controller is in the head / on the canbus.




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Brummkreisel said:
see on above mentioned page
"Rugged and Reliable

The Petrel 2 Fischer features all the modes of the Petrel 2 and incorporates a fischer connector for integration into rebreathers for primary or redundant PPO2 monitoring with full decompression."
Click to expand...

Only mentions monitoring not control. Totally different things.

I'M just in the beginning of my thougths and try to figure out what's possible. An additional solenoid is not in my mind. Starting at my problems I have been thinking about shutting down the vison and using the exisiting solenoid and batteries. Might be an stupid idea ...
Click to expand...

Yes, it's a stupid idea, sorry :-)

All you have available is cell monitoring, I guess it support all 3 cells if you buy the adapter from, for example, N@90.

Another option I do see right now is to use the Petrel for PPO2 monitoring and use the MAV to feed the loop. Not that convenient solution but better than leaving dive site w/o any dive.
Click to expand...

I think that's all that is available to you. You could add a leaky valve.

You may be better buying a different unit if all this interests you seriously.

Matt.
 
Dave1w said:
I think.... They call it controller to keep the terminology the same as the earlier predator units, but with the move to Petrel, as I understand, the Petrel is the display and the buttons, but the actual controller is in the head / on the canbus.

Sent from my iPhone using Tapatalk
Click to expand...

Interesting - I had not spotted that. Would make sense of some of the comments.

And when I re-read Bruce's post on DiveCAN I think that is what he is saying:

http://www.ccrexplorers.com/showthread.php?t=17167&p=166062&viewfull=1#post166062

The control handset needs to know what other DiveCAN devices to expect. A missing device could very well mean an unsafe configuration (i.e. trying to start a dive without the solenoid controller communication to the handset).
Click to expand...

Matt.
 
The Petrel isn't the only computer available.

A classic, not a vision, but I replaced my APD electronics with an AV-1 computer/controller and an old Shearwater HUD as a backup (can still fly fully manually even if the computer dies).

Still, it was a case of ripping out all the AP electronics and going with something new, I don't think the AP will play nicely with other controllers. And switching on/off is going to cause problems - if your new backup controller needs to be on to track deco and CNS etc, how do you disable the controller on it until you need it? And even if you can, when do you know you need to switch over?
 
Captain Starfish said:
The Petrel isn't the only computer available.

A classic, not a vision, but I replaced my APD electronics with an AV-1 computer/controller and an old Shearwater HUD as a backup (can still fly fully manually even if the computer dies).
Click to expand...

I've seen your mods, look really good! You can fly the same with the unmodified Vision if the computer dies.

Still, it was a case of ripping out all the AP electronics and going with something new, I don't think the AP will play nicely with other controllers. And switching on/off is going to cause problems - if your new backup controller needs to be on to track deco and CNS etc, how do you disable the controller on it until you need it? And even if you can, when do you know you need to switch over?
Click to expand...

You'd have to be able to calibrate the secondary, and then I guess you select a lower than low SP - say 0.4. Then you have a parachute. If you haven't noticed you have a major problem before then then I'm not sure you can ever be saved...

Matt.
 
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