| PIN | NAME | DESCRIPTION | USAGE |
| 1 | TX | SERIAL OUTPUT | CONNECT TO PIN 2 OF PC SERIAL DB9 (RX) |
| 2 | RX | SERIAL INPUT | CONNECT TO PIN 3 OF PC SERIAL DB9 (TX) |
| 3 | ATN | SERIAL ATTENTION | CONNECT TO PIN 4 OF PC SERIAL DB9 (DTR) |
| 4 | GND | SERIAL GROUND | CONNECT TO PIN 5 OF PC SERIAL DB9 (GND) |
| 5 | P0 | I/O PIN 0 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 6 | P1 | I/O PIN 1 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 7 | P2 | I/O PIN 2 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 8 | P3 | I/O PIN 3 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 9 | P4 | I/O PIN 4 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 10 | P5 | I/O PIN 5 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 11 | P6 | I/O PIN 6 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 12 | P7 | I/O PIN 7 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 13 | P8 | I/O PIN 8 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 14 | P9 | I/O PIN 9 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 15 | P10 | I/O PIN 10 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 16 | P11 | I/O PIN 11 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 17 | P12 | I/O PIN 12 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 18 | P13 | I/O PIN 13 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 19 | P14 | I/O PIN 14 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 20 | P15 | I/O PIN 15 | EACH OF THE 'P' PINS CAN EITHER BE INPUT OR OUTPUT |
| 21 | +5V | +5V SUPPLY | 5-VOLT INPUT OR REGULATED OUTPUT |
| 22 | RES | RESET I/O PIN | PULL LOW TO RESET; GOES LOW IN RESET |
| 23 | GND | SYSTEM GROUND | GROUND |
| 24 | PWR | REGULATOR INPUT | VOLTAGE REGULATOR INPUT; TAKES 5-15VDC |
NOTES:
1. The Basic stamp II uses +5 volt direct current power to operate.
2. A logical "true" is set at voltages above aproximately 1.4V.
3. Each I/O pin can source 20ma and sink 25ma.