This is the programmer I am using. 5 of them for $4
I cut off the TX pin and then on the bottom soldered a diode between TX and RX.
The second (and third) programmer then can be used to connect to the UART(s), and you will have a few spare 
This is the programmer I am using. 5 of them for $4
I cut off the TX pin and then on the bottom soldered a diode between TX and RX.
The second (and third) programmer then can be used to connect to the UART(s), and you will have a few spare