http://blog.polarsoft.com David Fisher is President of PolarSoft Inc., BACnet Evangelist and Old School Coder Mon, 14 Jul 2008 20:41:21 +0000 http://backend.userland.com/rss092 en I fielded a question today that contained a lot of misunderstandings about terminology for BACnet MAC Layers, in particular what the difference between BACnet 8802-3 and BACnet/IP is all about. It made reference to an article by FieldServer that also contains some misleading information: http://www.fieldserver.com/products/appnotes/009_bacnetprotocols.asp http://www.fieldserver.com/docs/pdf/AN009.pdf Here's the real story. BACnet/IP is the correct ... http://blog.polarsoft.com/?p=22 I had occasion today to go searching for an image of core memory to contribute to Coleman's blog. I found a really nice close up shot at audilab.bmed.mcgill.ca on Google images, but when I clicked through on the Google link I got this annoying popup: Since all I wanted to do ... http://blog.polarsoft.com/?p=7 We were recently advising a client who was making a BACnet device that supports multiple ports, in this case 8802-3 and several MS/TP ports. Since each device object is required to associate with one and only one network number and MAC address, the application entity (AE) must be homed on a ... http://blog.polarsoft.com/?p=16 Back in December 2000, Mssr. Mohamad Mansour posted a comment to the BACnet-Arabia forum that drew some responses. Recently  our colleague Sabry An-Naggar has spoken out again about this posting and that motivated me to write my own reply. Mssr. Mansour's original post is reproduced as a block quote below. I ... http://blog.polarsoft.com/?p=15 A client recently asked us why the Device object  Max_APDU_Length_Supported property has a value of 1476 for his Ethernet 8802-3 based device and where did that number come from?  The standard mentions a maximum NPDU length of 1497.  However when they read our code the value calculates out to 1496.  What is the ... http://blog.polarsoft.com/?p=18 It is said that the scanning electron beam used in CRTs produces radiation that over a long period of time may cause some physical harm to humans who spend a lot of time in front of the CRT. I don’t know if this is true, or if it is as ... http://blog.polarsoft.com/?p=6 Ingredients: 1 litre coconut cream 1 kg chicken pieces 3 potatoes, peeled and quartered 1 onion, halved 125 g peanuts 10 ml salt 45 ml masaman curry paste 45 ml fish sauce 15 ml tamarind juice 15 ml sugar Instructions: Bring the coconut cream to a boil in a large saucepan. Add the chicken, potatoes, onion, peanuts and salt, and simmer for 20 minutes. Remove a ladleful of coconut cream from the pan, and ... http://blog.polarsoft.com/?p=14 Ingredients: 10 dried red chilies 5 ml cumin seeds 15 ml coriander seeds 2 cardamom pods 3 cloves 90 ml chopped garlic 60 ml chopped shallots 15 ml oil 10 peppercorns 30 ml chopped lemon grass 5 ml chopped galangal 5 ml chopped bergamot skin 5 ml chopped coriander root 5 ml shrimp paste, grilled 250 g palm sugar 15 ml salt 60 ml tamarind juice Instructions: Coarsely chop the chilies and soak in water for 10 minutes. Drain. Dry-fry the cumin and coriander seeds, cardamom pods ... http://blog.polarsoft.com/?p=13 Ingredients: 3 Potatoes ½ Onion 30 ml margarine 7.5 ml cooking oil Instructions: Peel and grate three potatoes. Peel and chop ½ onion. Mix with the potatoes. Melt together in a pan, 15 ml. margarine, with 7.5 ml cooking oil, at 350 degrees. Spread the potatoes and onions evenly in the bottom of the skillet. Sprinkle with salt and pepper if you wish. Reduce ... http://blog.polarsoft.com/?p=12 Ingredients: 3 cloves of garlic, pounded 4 small red chilies, crushed 30 ml fish sauce   salt   freshly ground black pepper 500 g beef fillet, cut into thin strips 250 ml basil leaves 250 ml oil Instructions: Mix together the garlic, chilies, fish sauce, salt and black pepper, then marinate the beef in this mixture for 5 minutes. Fry the basil leaves in the oil until they become ... http://blog.polarsoft.com/?p=11