user manual

12
DUAL PORT RS-232 SERIAL INTERFACE
U6
R3
SW1
C1
C3
U3
C8
P1
U4
U1
P2
SW2
U7
J1
1
6
5
9
J4
C9
C5
R2
C4
U5
PORT1
PORT2
E1 E2
2
3
4
5
10
11
12
15
2
3
4
5
10
11
12
15
C2
U2
C6
Y1
U9
U6
M N
E3
E4
1
1
U10
D1 R4 D2 R5
1
1
14
13
25
1
6
1
6
5
9
J3
5
9
J2
R1
C7
Appendix: Circuit-Board Design