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Parallel LapLink Cable
The cable described below can be used to connect two PCs, to let them
communicate via the application program LapLink™.
It's recommended that you set up your parallel ports to either EPP or EPP/ECP
mode for use with this cable.
To build this cable, you'll need a shielded cable with at least 15
conductors, and two DB-25 male connectors.
| Description |
Male DB-25 |
==>> |
Male DB-25 |
Description |
| STROBE |
1 |
to |
1 |
STROBE |
| Data Bit 0 |
2 |
to |
15 |
/FAULT |
| Data Bit 1 |
3 |
to |
13 |
SEL |
| Data Bit 2 |
4 |
to |
12 |
POUT |
| Data Bit 3 |
5 |
to |
10 |
/ACK |
| Data Bit 4 |
6 |
to |
11 |
BUSY |
| Data Bit 5 |
7 |
Both not used |
Data Bit 5 |
| Data Bit 6 |
8 |
Both not used |
Data Bit 6 |
| Data Bit 7 |
9 |
Both not used |
Data Bit 7 |
| /ACK |
10 |
to |
5 |
Data Bit 3 |
| BUSY |
11 |
to |
6 |
Data Bit 4 |
| POUT |
12 |
to |
4 |
Data Bit 2 |
| SEL |
13 |
to |
3 |
Data Bit 1 |
| /AUTOFEED |
14 |
to |
14 |
/AUTOFEED |
| /FAULT |
15 |
to |
2
|
Data Bit 0 |
| /RESET |
16 |
to |
16 |
/RESET |
| /SLCT IN |
17 |
to |
17 |
/SLCT IN |
| GND |
18 |
Both not used |
GND |
| GND |
19 |
Both not used |
GND |
| GND |
20 |
Both not used |
GND |
| GND |
21 |
Both not used |
GND |
| GND |
22 |
Both not used |
GND |
| GND |
23 |
Both not used |
GND |
| GND |
24 |
Both not used |
GND |
| GND |
25 |
to |
25
|
GND |
It is suggested that you attach the drain wire of the shield of your cable to
the shield of the DB-25 connector.
Note - There are a number of cable diagrams for LapLink parallel cables on
the web, many of which are contradictory. The above chart matches
the pinout of a LapLink parallel cable measured by me. The cable was from
a 1996 version of LapLink for Windows. If you've got data that contradicts
the above chart, please drop me a line.
One reader (Joakim R. Perrine) did
just that, and has reported that the above set of pinouts don't work for Windows
95's Direct Cable Connection program (DCC), but that a cable built as described
in the following table does.
To build this cable, you'll need a shielded cable with at least 17
conductors, and two DB-25 male connectors.
| Description |
Male DB-25 |
==>> |
Male DB-25 |
Description |
| STROBE |
1 |
Both not used |
STROBE |
| Data Bit 0 |
2 |
to |
15 |
/FAULT |
| Data Bit 1 |
3 |
to |
13 |
SEL |
| Data Bit 2 |
4 |
to |
12 |
POUT |
| Data Bit 3 |
5 |
to |
10 |
/ACK |
| Data Bit 4 |
6 |
to |
11 |
BUSY |
| Data Bit 5 |
7 |
Both not used |
Data Bit 5 |
| Data Bit 6 |
8 |
Both not used |
Data Bit 6 |
| Data Bit 7 |
9 |
Both not used |
Data Bit 7 |
| /ACK |
10 |
to |
5 |
Data Bit 3 |
| BUSY |
11 |
to |
6 |
Data Bit 4 |
| POUT |
12 |
to |
4 |
Data Bit 2 |
| SEL |
13 |
to |
3 |
Data Bit 1 |
| /AUTOFEED |
14 |
Both not used |
/AUTOFEED |
| /FAULT |
15 |
to |
2
|
Data Bit 0 |
| /RESET |
16 |
Both not used |
/RESET |
| /SLCT IN |
17 |
to |
19 |
/SLCT IN |
| GND |
18 |
to |
18 |
GND |
| GND |
19 |
to |
17 |
/SLCT IN |
| GND |
20 |
Both not used |
GND |
| GND |
21 |
to |
21 |
GND |
| GND |
22 |
to |
22 |
GND |
| GND |
23 |
to |
23 |
GND |
| GND |
24 |
Both not used |
GND |
| GND |
25 |
to |
25
|
GND |
It is suggested that you attach the drain wire of the shield of your cable to
the shield of the DB-25 connector.
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