Black Box IC171C - Manual (Page 29)

24
RS422/485 SERIAL INTERFACE PLUS
SW2
C3
U4
74193
C2
Y1
U3
74193
U2
C1
SLS08-22V10
U1
74LS74
U6
C5
SW1
A
T
PPL
L
R1
BCD
RP1
1
AUT
O
RTS
422
E3 RX
R2
75173
U8
C7
R4
R3
R18 R6 R5
14
1
NS
M
E2
D1
C9
U5
C4
E1
2
3
4
5
7
10
11
12
15
P2
P1
SLS07-22V10
C6
74LS245
U7
25
13
R14
R7
R8
R9
R10
R11
R12
R13
E1A- 530
S10- 485
R17
R16
TX
C8
R15
E4
AUT
O
RTS
422
E5
75174
U9
P3
16550
Appendix: Circuit-Board Design