westaust55
Moderator
A while back there was "guidance" to test the voltages at the PICAXE end of a USB to serial cable as there should be around -12 volts present before the 22 kOhm resistor.
This is not the case and there is a specific chip available used for such cables.
I have today during some web surfing stumbled across a schematic.
While the attached may not be 100% accurate for the AXE027 US to serial cable, in the absence of an AXE027 schematic this is likely fairly close.
Hopefully this may clarify the position for those in trouble with USB to serial cables in future.
This is not the case and there is a specific chip available used for such cables.
I have today during some web surfing stumbled across a schematic.
While the attached may not be 100% accurate for the AXE027 US to serial cable, in the absence of an AXE027 schematic this is likely fairly close.
Hopefully this may clarify the position for those in trouble with USB to serial cables in future.
Attachments
-
39.5 KB Views: 47
Last edited: