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TTP-248M Bar Code Printer
Service Manual
U19 is used for industrial long-distance asynchronous communication;U19 is
optional.
3.13 Parallel Port Circuit
U2/100
U2/101
U2/98
U2/102
U2/103
U2/104
U2/105
U2/106
U2/107
U2/110
U2/111
U2/112
U2/113
U2/115
PE
/Write
R17
10K
GNDDIGITAL GND
SELECT
PE
ERROR
/Wait
/DStrb
/Init
/AStrb
VDD R18
10K
R56
100
C5
220p
VDD
D0
D1
D2
D3
D4
D5
D6
D7
/Write
Intr
/Wait
/DStrb
D0
D1
D2
D3
D4
D5
D6
D7
/Write
Intr
/Init
/AStrb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
JP4
CENTRONIC
R19
10K
1 2
U6A 74HCT14
56
U6C
74HCT14
8 9
U6D
74HCT14
ERROR
SELECT
PE
10 11
U6E 74HCT14
12 13
U6F
74HCT14
PC4
220p
PC1
220p
PC2
220p
PC3
220p
PR1 10K
PR2
10K
PR3
10K
PR4
10K
PR5
10K
PR6
10K
PR7
10K
PR8
10K
PR22
100
PR23
100
PR24
100
PR25
100
R17
10K
GNDDIGITAL GND
SELECT
PE
ERROR
/Wait
/DStrb
/Init
/AStrb
VDD R18
10K
R56
100
C5
220p
VDD
D0
D1
D2
D3
D4
D5
D6
D7
/Write
Intr
/Wait
/DStrb
D0
D1
D2
D3
D4
D5
D6
D7
/Write
Intr
/Init
/AStrb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
JP4
CENTRONIC
R19
10K
1 2
U6A 74HCT14
34
U6B 74HCT14
56
U6C
74HCT14
8 9
U6D
74HCT14
ERROR
SELECT
PE
10 11
U6E 74HCT14
12 13
U6F
74HCT14
PC4
220p
PC1
220p
PC2
220p
PC3
220p
PR1 10K
PR2
10K
PR3
10K
PR4
10K
PR5
10K
PR6
10K
PR7
10K
PR8
10K
PR22
100
PR23
100
PR24
100
PR25
100
SELECT
ERROR
Fig. 3.16 Parallel Port Circuit
Censorings port is SPP mode and one-way communication.