We are aware of this possibility when we first thought of implementing Powershot POE with the Reset function. However feedback from the hardware team and that it was tested with 100m using 1 wire for negative will not pose a problem at all.
Alex sB Tech Support -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Blaine Fleming Sent: Friday, July 11, 2003 2:57 PM To: '[EMAIL PROTECTED]' Subject: [smartBridges] PowerShot pinout question I have to ask this as I wonder if it might be contributing to some of the stability problems. The powershot uses pins 7 & 8 for positive and pin 5 for negative. Pin 4 is used for the device reset button. PoE typically uses two wires for each lead so that the voltage and current drop is minimal. By only using one wire for the negative lead the voltage and current drop significantly. In lab conditions, this won't make a huge difference. However, once temperature is factored in the possible drop on 100 Feet of cable and a 12 volt supply is likely to be below minimal operational limits. Has all this been considered in the design? I think that changing the reset button from a normally open type to a normally closed type and then adding a transistor and probably a diode to the radio would be more effective. This way the reset wire is always acting as a negative lead except when performing a reset. The additional transistor would invert the state of the reset button and provide the circuit a connection to the additional negative lead. It's late at night but I think my thoughts are clear. Any ideas, thoughts, comments? --Blaine The PART-15.ORG smartBridges Discussion List To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe smartBridges <yournickname> To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe smartBridges) Archives: http://archives.part-15.org The PART-15.ORG smartBridges Discussion List To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe smartBridges <yournickname> To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe smartBridges) Archives: http://archives.part-15.org
