TTL HMI to NRF52840

Working with a Pinnacle 100 using an NRF52840.  I have a HMI with a TTL serial interface.  I have verified I/O on the HMI itself via a TTL/USB converter to Tera term, but having trouble with TTL comm to the NRF.  Is there sample code available to reference for setting up the port for this.

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