In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

If the V+ LED does not light when the power switch is in position 2 then the board may have a problem.  As Terry points out, the ULNs used on the board for the terminal outputs are open-collector and can only switch ground, so V+ provides the positive side of the circuit for relays, etc.   With the power switch in position 2 you should be able to read your power supply voltage between the V+ and GND terminals.

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=268341#m268375

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)