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Digi One EM Hardware Reference 19
Chapter 4
Sample Application: TTL Signals to
EIA-232
The following figure is an example of how to convert the Digi
One EM signals to normal serial voltage levels.
0.1uF
1
2
C6
0.1uF
1
2
C4
0.1uF
1
2
C3
0.1uF
2
1
C5
+5V
GND
11
10
9
8
7
6
5
4
3
2
1
DB9
P1
RS-232 SERIAL 9-PIN CONNECTOR
SHIELD
SHIELD
GND
GND
17
13
25
24
16
15
14
12
2821
120
36
27
19 18
22 23
26 27
54
89
ADM211E
U1
RS-232 LINE RECVR 5RX 4TX
+5V
GND
1211
109
87
65
43
21
SOCKET 2X6
DIGI ONE EM CONNECTOR
P6
3
2
1
RESERVED HEADER
P5
GND
GND GND
RESET SWITCH
13
24
SW1