J1 | Programming Header | 30310-6002HB | 1 | |
X1 | DB-9 female connector w/solder cup connectors | 1 | ||
R1-R3 | 1/4W 5% 4.7K resistors | Generic | 3 | |
D1-D3 | 5.1v Zener Diode | Generic | 3 | |
PCB (looks a little different than shown here) | Custom | 1 |
Solder both, making sure that you get solder underneath the pins of the DB9.