Hello Andy,

  I have built a heat sinked SSR to control my big linear PSU on / OFF

  It works fine with anything over about 2.1V DC on the input pins and
  switches  the  psu with full load with no excess heating over a long
  period.  But when I connect the input pins to a serial port (COM4 in
  this case, I have an add on serial card with 4 extra ports) with the
  +ve  input pin on the SSR to terminals 4 and 7 connected together on
  the  serial connector, and the -ve SSR pin to terminal 5 (ground) on
  COM4 there is no change of state when SimpleTimer turns on or off. I
  see  -5.5V  all  the  time on the SSR input pins. I run Lady Heather
  software  on COM7 and it works fine with my Trimble Thunderbolt GPS.
  Windows  7  64 bit sees no issue with the COM ports and says COM4 is
  working  correctly.  Any  idea what I have done wrong or how to test
  things? Thanks! 2E0ILY

Wednesday, April 11, 2018, 5:51:19 PM, you wrote:

> There is now a prettier version at
> http://www.g4jnt.com/DropF/simpletimer.zip


> Same functionality, except it also allows  HH:MM as well as HH:MM:SS


> Andy






--
Best regards,
 Chris                            mailto:[email protected]