Check that pic pin 18 is connected to Max pin 12 and pic pin 19 is connected to max pin 11.
Since it seems you have a wired PCB then very likely you are unable to change the DB9 connection, so cross the serial cable
Al.
Check that pic pin 18 is connected to Max pin 12 and pic pin 19 is connected to max pin 11.
Since it seems you have a wired PCB then very likely you are unable to change the DB9 connection, so cross the serial cable
Al.
All progress began with an idea
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