Manual
Appendix F - Schematic
Sealevel Systems VERSA COMM+4/EX Page 21
1K
R3
1
2
3
4
J
3
A
D3
1N4148
5
3
7
9
11
13
15
17
19 20
18
16
14
12
10
8
6
4
21
J3B
D4
1N4148
5
3
7
9
11
13
15
17
19 20
18
16
14
12
10
8
6
4
21
J4B
1
2
3
4
J
4
A
1K
R4
IRQ7
IRQ9
IRQ6
IRQ5
IRQ11
IRQ10
IRQ12
IRQ15
8
D4
P2
12
D6
P2
10
D5
P2
6
D3
P2
8
B4
P1
42
B21
P1
44
B22
P1
46
B23
P1 D1
1N4148
5
3
7
9
11
13
15
17
19 20
18
16
14
12
10
8
6
4
21
J1B
1
2
3
4
J
1
A
1K
R1
D2
1N4148
5
3
7
9
11
13
15
17
19 20
18
16
14
12
10
8
6
4
21
J2B
1
2
3
4
J
2
A
1K
R2
BIOW
BA2
BA1
BA0
BIOR
CLK
CS4/
CS3/
CS2/
CS1/
GND
GND
37
RESET
18
IO W
52
IO R
34
A0
33
A1
32
A2
20
CS2
50
CS3
54
CS4
6
G
N
D
2
3
G
N
D
4
0
G
N
D
5
7
G
N
D
53
TX3
56
RTS4
58
DTR4
59
CTS4
60
DSR4
61
CD4
62
RI4
63
RX4
35
XTAL 1
51
TX3
48
RTS3
46
DTR3
45
CTS3
44
DSR3
43
CD3
42
RI3
41
RX3
19
TX2
22
RTS2
24
DTR2
25
CTS2
26
DSR2
27
CD2
28
RI2
29
RX2
17
TX1
14
RTS1
12
DTR1
11
CTS1
10
DSR1
9
CD1
8
RI1
7
RX1
1
3
V
C
C
3
0
V
C
C
4
7
V
C
C
6
4
V
C
C
36
XTAL 2
16
CS1
66
D0
67
D1
68
D2
1
D3
2
D4
3
D5
4
D6
5
D7
15
IN T1
21
IN T2
49
IN T3
55
IN T4
65
IN TSE L
31
NC
38
RXRDY
39
TXRDY
16C554
U3
GND
GND
CS1/
CS2/
CS3/
CS4/
CLK
BA2
IRQ3
IRQ4
48
B24
P1
50
B25
P1
SHEET 1
SHEET 1
SHEET 1
SHEET 1
SHEET 1
SHEET 1
SHEET 1
BA0
BIOR
BIOW
BA1
BRES ET
BD7
BD6
BD5
SHEET 1
SHEET 1
SHEET 1
SHEET 1
SHEET 1
SHEET 1
SHEET 1
SHEET 1
BD0
BD1
BD2
BD3
BD4
SHEET 1
SHEET 1
SHEET 1
SHEET 1
FOR TRI-STATE IRQ CUT
CONNECTION BETWEEN
PINS 1 & 2 ON E13 ON
BOTTOM SIDE OF BOARD
FOR 16C654 CUT CONNECTION
BETWEEN PINS 1 & 2 ON E12
ON BO TTOM SIDE O F BOAR D
RESGND
BD0
BD1
BD2
BD3
BD4
BD5
BD6
BD7
BRESET
INT1INT1
INT2INT2
INT3INT3
INT4INT4
+5V
GND
21
E1
21
E2
1K
R7
RD2
RI2
DCD2
DSR2
CTS2
DTR2
RTS2
TD2
RD3
RI3
DCD3
RD1
RI1
DCD1
DSR1
CTS1
DTR1
RTS1
TD1
2
RA1
1
VC C+
3
RA2
4
RA3
5
DY1
6
DY2
7
RA4
8
DY3
9
RA5
10
VCC-
11
GND
12
RY5
13
DA3
14
RY4
15
DA2
16
DA1
18
RY2
17
RY3
19
RY1
20
VCC
GD75232
U5
2
RA1
1
VC C+
3
RA2
4
RA3
5
DY1
6
DY2
7
RA4
8
DY3
9
RA5
10
VCC-
11
GND
12
RY5
13
DA3
14
RY4
15
DA2
16
DA1
18
RY2
17
RY3
19
RY1
20
VCC
GD75232
U6
+5V
+5V +12V -12V
RD1/
36
P3:36
RTS2/
RTS1/
17
P3:17
30
P3:30
DSR1/
18
P3:18
DTR1/
34
P3:34
DCD1/
37
P3:37
RI1/
15
P3:15
TD1/
35
P3:35
CTS1/
16
P3:16
DSR2/
29
P3:29
DTR2/
13
P3:13
DCD2/
10
P3:10
RI2/
32
P3:32
RD2/
11
P3:11
TD2/
12
P3:12
CTS2/
31
P3:31
GND
2
RA1
1
VC C+
3
RA2
4
RA3
5
DY1
6
DY2
7
RA4
8
DY3
9
RA5
10
VCC-
11
GND
12
RY5
13
DA3
14
RY4
15
DA2
16
DA1
18
RY2
17
RY3
19
RY1
20
VCC
GD75232
U8
TD4
RTS4
DTR4
CTS4
DSR4
DCD4
RI4
RD4
TD3
RTS3
DTR3
CTS3
DSR3
2
RA1
1
VC C+
3
RA2
4
RA3
5
DY1
6
DY2
7
RA4
8
DY3
9
RA5
10
VCC-
11
GND
12
RY5
13
DA3
14
RY4
15
DA2
16
DA1
18
RY2
17
RY3
19
RY1
20
VCC
GD75232
U7
GND
RTS3/
RTS4/
8
P3:8
21
P3:21
DTR3/
25
P3:25
DCD3/
28
P3:28
RI3/
6
P3:6
RD3/
27
P3:27
DSR3/
9
P3:9
TD3/
26
P3:26
CTS3/
7
P3:7
DTR4/
4
P3:4
DCD4/
1
P3:1
RI4/
23
P3:23
RD4/
2
P3:2
DSR4/
20
P3:20
TD4/
3
P3:3
CTS4/
22
P3:22