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980264-001 Rev. B 3-19
CHAPTER 3
Vcc
J8
8
7
6
5
4
3
2
1
Vdd+24V
C1+
C1-
T1 IN
R2 OUT
T2 IN
R1 OUT
C2+
C2-
T1 OUT
R2 IN
T2 OUT
R1 IN
U- U+
U18
Vcc
100nf
1k
5
4
3
2
1
J5
EXT2
TXD1
RXD1
TXD2
RXD2
EXT3
Host Serial
Interface
D24~31
CLK
OC
D1
D2
D3
D4
D5
D6
D7
D8
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
U38
D16~23
U39
U40
U37
U41
CLK
OC
CLK
OC
DIR
G
1G
2G
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
A1
A2
A3
A4
A5
A6
A7
A8
1Y1
1Y2
1Y3
1Y4
2Y1
2Y2
2Y3
2Y4
D1
D2
D3
D4
D5
D6
D7
D8
D1
D2
D3
D4
D5
D6
D7
D8
B1
B2
B3
B4
B5
B6
B7
B8
1A1
1A2
1A3
1A4
2A1
2A2
2A3
2A4
J14
P0~7
BUSY
ACK/
PERROR
FAULT/
SELECT
SELECTIN/*
AUTOFD/*
STROBE//*
CS 1
DIR
CS 1
STROBE//
CS Read/
CSWrite
DIR
SORTIE
CSRead/
STROBE//
AUTOFD/
SELECTIN/
R_W/
CS//
STROBE//
IT
CSWrite/
DIR
CSWrite/
D24~31
INIT/
INIT
Host
Parallel
Interface
Figure 3-6. Serial and Parallel Port Circuitry.