In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

That adapter is expecting RS-232 on the DB-9 side so you need to use N9600.  For transmitting to the PC you would connect RB.1 to pin 2 of the DB-9, and ground on your SX board to pin 5 of the DB-9.  

When going between the SX and a USB port it's cleaner to use the USB2SER as it expects TTL levels on the serial side.

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