Specifications

BASIC Stamp II
Page 200 • BASIC Stamp Programming Manual 1.8 • Parallax, Inc.
Pin Name Description Comments
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 Active-high reset 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 pin can source 20 ma and sink 25 ma.
6 P1 I/O pin 1
7 P2 I/O pin 2 P0-P7 and P8-P15, as groups, can each
8 P3 I/O pin 3 source a total of 40 ma and sink 50 ma.
9 P4 I/O pin 4
10 P5 I/O pin 5
11 P6 I/O pin 6
12 P7 I/O pin 7
13 P8 I/O pin 8
14 P9 I/O pin 9
15 P10 I/O pin 10
16 P11 I/O pin 11
17 P12 I/O pin 12
18 P13 I/O pin 13
19 P14 I/O pin 14
20 P15 I/O pin 15
21 +5V ** +5V supply 5-volt input or regulated output.
22 RES Active-low reset Pull low to reset; goes low during reset.
23 GND System ground
24 PWR ** Regulator input Voltage regulator input; takes 5-15 volts.
* For automatic serial port selection by
the BASIC Stamp II software, there
must also be a connection from DSR
(DB9 pin 6) to RTS (DB9 pin 7). This
connection is made on the BASIC
Stamp II carrier board. If you are not
using the carrier board, then you must
make this connection yourself, or use
the command-line option to tell the
software which serial port to use.
** During normal operation, the BASIC
Stamp II takes about 7 mA. In vari-
ous power-down modes, consump-
tion can be reduced to about 50 µA.
TX
RX
ATN
GND
P0
P1
P2
P3
P4
P5
P6
P7
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
PWR
GND
RES
+5V
P15
P14
P13
P12
P11
P10
P9
P8