You can use the PuTTY cli command plink. For example: plink -serial COM1 -sercfg 9600,8,N,1,N This will connect to serial port COM1 at 9600 baud, 8 databits

You can use the PuTTY cli command plink. For example: plink -serial COM1 -sercfg 9600,8,N,1,N This will connect to serial port COM1 at 9600 baud, 8 databits, no parity bits, 1 stop bit and no flow control.