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SMALL CIRCUITS
COLLECTION
PC-to-PC
with Two Printer Cables
004
1a
2a
K1
K2
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
10
11
12
13
14
15
16
17
18
10
11
12
13
14
15
16
17
18
014117 - 11
014117-1
Table 1 Adapter 1 (2 x Centronics)
A special cable known as Interlink or Laplink is usually
necessary for a 4-bit direct cable connection between two
computers. Using a small adapter between two printer
cables or a different adapter between computer and printer
cable can also accomplish this type of connection.
The first adapter (
Figures 1a
and
2a
) contains two 36-
way Centronics connectors with crossed connections and
is intended to connect two printer cables together. In order
to make a compact assembly, vertical connectors have
been used, but right-angle connectors may be used as
well. The second (
Figures 1b
and
2b
) is fitted with right-
angle connectors because it is intended to be plugged into
the back of a PC. Both layouts also contain additional
crossed connections for 8-bit communications (Norton
Commander, for example). Only one connection is missing
from each connector: ‘Initialise printer’ (pin 16 of 25-way
Sub-D, ‘Input prime’ pin 31 of Centronics) to ‘Data7’ (pin 9
on both connectors). Normally these are joined within each
Conn.1
Conn.2
Conn.1 Conn.2
11 6
12 4
13 3
14 8
31 9
32 2
36 36
19 - 29 19 - 29 (GND)
Other pins not connected
(15/16/17/18/33/34/35)
1
7
2
32
3
13
4
12
5
10
6
11
7
1
8
14
9
31
10
5
connector, in this case however this line has been cross
connected to the opposite connector, because some cables
were found to have this. It may take some trial and error to
26
Elektor Electronics
12/2001
SMALL CIRCUITS
COLLECTION
1b
2b
K1
1
14
2
15
K2
3
16
1
2
3
4
5
6
7
8
9
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
4
17
5
18
6
19
7
20
8
10
11
12
13
14
15
16
17
18
21
9
22
10
23
11
24
12
25
13
014117 - 12
014117-2
K1
K2
Table 2 Adapter 2
(25-way Sub-D to Centronics)
establish if this connection is really necessary for 8-bit
communications.
Both adapters have been tested between a 40 MHz 486
with Windows 95 and a standard printer port, and a
166 MHz Pentium with Windows 98 and an EPP/ECP-com-
patible printer port. A warning: the installation of a direct
cable connection with either operating system is anything
but easy. The Internet contains various information sources
and FAQs, also have a look at
www.lpt.com
. We also refer
you to two articles in previous
Elektor Electronics
issues: ‘a
cable for all occasions’ in the PC Topics section of the
November 1999 issue and ‘a simple PC network’ in the PC
Topics section of February 1998. Two tables with the nec-
essary interconnections may be easier to understand than
the schematics.
D25
Centronics
D25
Centronics
1
7
12
4
2
32
13
3
3
13
14
8
4
12
15
2
5
10
16
9
6
11
17
36
7
1
18 to 25
19 to 29 (GND)
8
14
9
31
At the Centronics -connec-
tor end pins 15 to 18/30/33/
34/35 are not connected.
10
5
11
6
(014117-1)
12/2001
Elektor Electronics
27
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