This USB to DDL converter sometimes can transfer a signal but sometimes can't. What's the possible issue here?enter image description here

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    \$\begingroup\$ The yellow 5V/3.3V power supply select jumper looks like it is missing a jumper. Check the documentation to be sure, but it looks like the center pin should be jumper connected to either the 5V supply or the 3.3V supply, depending on what logic level is needed on the TXD/RXD side. \$\endgroup\$ – MarkU Feb 23 at 8:55
  • \$\begingroup\$ Yes, that solved the problem. Thank you! \$\endgroup\$ – Kris Han Feb 24 at 0:59

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