cjd Posted July 23, 2006 Author Share Posted July 23, 2006 You can star off the line from the panel not a RKP and the 680 resistor should be cut in the panel and one fitted to each RKP, like you say.Yes, it causes problems like ***** displayed on RKP! right!! point taken will start the rewiring tomorow and let u know how i get on. Thanks for your advice Link to comment https://www.thesecurityinstaller.co.uk/community/topic/11427-do-i-need-a-new-power-supply/page/2/#findComment-108033 Share on other sites More sharing options...
Brian c Posted July 23, 2006 Share Posted July 23, 2006 doesn't the resistor size vary according the amount of keypads (if star network)? No, there should always be 2 in total. 1 in panel and 1 in last RKP, or 1 in each of the last RKP's if starred from the panel. If you don't know......ask. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/11427-do-i-need-a-new-power-supply/page/2/#findComment-108035 Share on other sites More sharing options...
Guest Posted July 23, 2006 Share Posted July 23, 2006 what if you have five "branches".. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/11427-do-i-need-a-new-power-supply/page/2/#findComment-108043 Share on other sites More sharing options...
Brian c Posted July 23, 2006 Share Posted July 23, 2006 Never tried it, but I think it would cause major problems. I think two would be the max for RKP's. If you don't know......ask. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/11427-do-i-need-a-new-power-supply/page/2/#findComment-108045 Share on other sites More sharing options...
Guest Posted July 23, 2006 Share Posted July 23, 2006 if i have not yet lost my memory RS485 "want's" 120ohm end of line resistor. having 680 ohm resistors would mean there is 4,67 branches (one resistor is in panel end..) Link to comment https://www.thesecurityinstaller.co.uk/community/topic/11427-do-i-need-a-new-power-supply/page/2/#findComment-108051 Share on other sites More sharing options...
Andy D Posted July 23, 2006 Share Posted July 23, 2006 I've had problems adding a MK7 keypad to a system with a MK2 keypad(like yours) and had to change the old keypad for a MK7 Link to comment https://www.thesecurityinstaller.co.uk/community/topic/11427-do-i-need-a-new-power-supply/page/2/#findComment-108055 Share on other sites More sharing options...
Brian c Posted July 23, 2006 Share Posted July 23, 2006 You are quite right Georg, RS485 looks for 120Ohms and two 680Ohms in parallel is 340Ohms, so I'm not quite sure how it works on the Galaxy.....but it does!! If you don't know......ask. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/11427-do-i-need-a-new-power-supply/page/2/#findComment-108056 Share on other sites More sharing options...
Guest Posted July 23, 2006 Share Posted July 23, 2006 ...how it works on the Galaxy.....but it does!! i bet it doesn't say it in a manual.. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/11427-do-i-need-a-new-power-supply/page/2/#findComment-108057 Share on other sites More sharing options...
Brian c Posted July 23, 2006 Share Posted July 23, 2006 lol you're right, it doesn't!! It just says it has 1x 680 in the panel and 1x 680 at the end of the line. You've got me thinking now Must be Galaxy's own version of RS485! If you don't know......ask. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/11427-do-i-need-a-new-power-supply/page/2/#findComment-108058 Share on other sites More sharing options...
morph Posted July 23, 2006 Share Posted July 23, 2006 Havent we been here before ! What did you upgrade the main control panel? what are the numbers that are on the labels on the chips? Link to comment https://www.thesecurityinstaller.co.uk/community/topic/11427-do-i-need-a-new-power-supply/page/2/#findComment-108059 Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.