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Mark&Catherine 
Admiral 
Joined: 18 January 2013 Location: Greece Status: Offline Points: 1219 |
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 Posted: 05 April 2014 at 11:01 |
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Ok thanks, I'll see if I can find the reset procedure.
Mark |
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385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine
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Fendant
Admiral
Joined: 03 November 2012 Location: Switzerland Status: Offline Points: 1671 |
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Posted: 06 April 2014 at 07:31 |
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Hi Mark,
how do you get to the diagnostics page? I have problems with my fluxgate FC 40, which resists to being calibrated. Maybe I can locate the problem that way.
Again the yard and the local Simrad dealer are playing ping pong.
Thx
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Frank
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Mark&Catherine
Admiral
Joined: 18 January 2013 Location: Greece Status: Offline Points: 1219 |
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Posted: 06 April 2014 at 09:48 |
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On the nss go pages, settings, network, the diagnostics
Mark |
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385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine
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CharlesP
Admiral
Joined: 23 September 2010 Location: United Kingdom Status: Offline Points: 1208 |
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Posted: 06 April 2014 at 11:03 |
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Hi Mark. Just sent you a PM.
Charles |
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'MERIDIAN LADY'
320 Nr 536 2010 Medway |
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Mark&Catherine
Admiral
Joined: 18 January 2013 Location: Greece Status: Offline Points: 1219 |
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Posted: 06 April 2014 at 13:33 |
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yes Charles, seen it thanks.
Mark
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385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine
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High Time
Vice Admiral 
Joined: 04 September 2012 Location: Portsmouth UK Status: Offline Points: 819 |
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Posted: 07 April 2014 at 12:29 |
To be honest, I'm not sure if the terminator is at the masthead (as per the Manual) or at the foot of the mast inside. I remember some interchange on this a year or so ago but can't find the reference. If yours has a red disc on it, then it is probably the terminator. Let us know how you get on tracking down the problem. It's slightly worrying that one fault (whatever it is) can take down the whole bus system. In extremis, I guess you can leave the network switched off and just use the plotter which has it's own built in GPS. I can live without wind info but would still like to receive depth. Does your problem also take out the auto pilot? That could be a problem when cruising with just my wife on board!
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Roger
High Time (415 #038) |
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Wild
Vice Admiral
Joined: 18 March 2010 Location: Turkey-Greece Status: Offline Points: 937 |
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Posted: 07 April 2014 at 13:44 |
 This is how the terminator looks like. I think, hey is at the top of the mast in to the windvane, but normaly you can disconnect the wire (down on the mast or near by the charttable)of the T joiner(or 7 way joiner) and put a spare terminator (we do have a spare one)in place so you isolated the windvane, somtimes it is easyer to disconnect the IS20 winddisplay from the other IS20 instruments and put the terminator in place of the simnet cable you have removed from the last IS20 in the simnet system.This is the way you can check instrument by instrument to isolate the bad one. Edited by Wild - 07 April 2014 at 13:49 |
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Wild and Wet
Belgium 545e#268 |
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Mark&Catherine
Admiral
Joined: 18 January 2013 Location: Greece Status: Offline Points: 1219 |
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Posted: 07 April 2014 at 14:12 |
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yes Roger it takes out the pilot because it cant work out what to do, so it lets go.
The terminator at the other end of the bus, in my case in the starboard locker by the instruments, looks like this, but the one at the base of the mast doesn't its the one with the little can on a wire, but it does have a red disk. Im trying to get the local dealer to come to the boat with a spare terminator, but so far he hasn't shown any interest in coming and less understanding of the problem. I might just buy one and do it myself. Mark
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385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine
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Johan Hackman
Admiral of the Fleet 
Joined: 24 August 2005 Location: Sweden Status: Offline Points: 4361 |
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Posted: 07 April 2014 at 18:25 |
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The NMEA2000 architecture says that there should be a terminator at each end of the "back-bone". As you probably now, SimNet is "almost" NMEA2000. It only breaks a few not so important rules in the protocol. A terminator is a resistor that prevents an echo, i.e. that the data on the bus is bouncing back in the direction it came.
You will find that one end is the wind vane and this unit has a terminator built in. It is only at the other end you need to add a red plug. A terminator along the back-bone, at the mast base for example, will probably create problems. If you have one, you should remove it to see if the problems go away. Just my two cents. Johan |
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Mark&Catherine
Admiral
Joined: 18 January 2013 Location: Greece Status: Offline Points: 1219 |
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Posted: 11 May 2014 at 05:30 |
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Ok I am making progress with this.
My fault exhibit itself as many RX message errors, the frequency of which varied from once very few seconds to once or twice an hour. Working through the boat I found all of the bus connectors and the terminators, checked all the connections for wear and corrosion, with none found. I thought there might be 3 possible causes, An instrument gone faulty and not responding, or sending bad messages Something wrong with the cable up the mast, and or the wind instrument, because often we would lose apparent wind data A software problem causing collisions on the bus. the local Simrad agent didn't appear to understand any of these potential issues, and never turned up at the boat despite several calls to arrange such a visit. Next I started disconnecting instruments to see if the bus errors would go away, but they didn't Eventually I forced the network to rediscover the instruments and reset the interaction between them. Effectively a reset as was suggested earlier in the thread. I have found now that when I power up the network, all the instruments boot up fine and connect well, including the auto helm computer, and I leave the NSS off for a few minutes to the everything stabilise. then when the chart plotter goes on, it appears to 'join in' without seizing and control and everything proceeds as expected, with no bus errors. My conclusion is that the bus connections got screwed up somehow, so that messages were misinterpreted or two instruments or devices were trying to play the same role. Anyway so far so good, I'll let you know if I have a repeat performance. Mark |
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385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine
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Mark&Catherine wrote: