ELM329
Example Applications (continued)
+5V
RS232
Interface
(DB9F)
4.7KW
10KW
10KW
3 (TxD)
2N3904
1N4148
1N4148
5 (SG)
+5V
0.1µF
10KW
4.7KW
2N3906
2 (RxD)
1 (DCD)
4 (DTR)
6 (DSR)
+5V
+5V
22
21
20
19
10
18
11
17
16
13
15
329
7 (RTS)
8 (CTS)
12
14
Figure 11. An Alternative RS232 Interface
USB
5.0V
TVS
Interface
(type ‘B’
connector)
+5V
7
6
8
5
4
3
1 (+5)
2 (D-)
3 (D+)
4 (SG)
SiLabs
CP2102
1µF
26 25
0.1µF
+5V
+5V
Note: You my wish to also consider one
of the FTDI modules such as the
DB9-USB-D5-F
22
21
20
19
10
18
11
17
16
13
15
329
12
14
Figure 12. A USB Interface
ELM329DSB
Elm Electronics – Circuits for the Hobbyist
71 of 76
www.elmelectronics.com
ELM [ ELM ELECTRONICS ]
