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You also can build your own null modem or parallel data-transfer
cable using the wiring diagrams that follow. Table 11.19 shows the
pins you must connect for a serial cable, using either DB-9 (9-pin)
or DB-25 (25-pin) connectors. Table 11.20 shows the connections
for a parallel port cable. The parallel cable is slightly harder to
build, but is recommended because of its much higher transfer
speed and because it will not interfere with existing modems and
mouse drivers on computers.
Table 11.19 3-Wire Serial Null Modem Cable Pinouts
PC#1 DB-9 DB-25 DB-25 DB-9 PC#2
TD 3 2 3 2 RD
RD 2 3 2 3 TD
SG 5 7 7 5 SG
Table 11.20 11-Wire Parallel Data-Transfer Cable Pinouts
PC #1 PC #2
2 15
15 2
3 13
13 3
4 12
12 4
5 10
10 5
6 11
11 6
25 25
Direct Cable Connections 291
If you plan to use parallel-mode DCC on a frequent basis, consider
purchasing a high-speed Direct Parallel Universal Fast Cable from
Parallel Technologies, creators of the Direct Cable Connection software
for Microsoft (www.lpt.com). This cable also works with thirdparty
remote-control and file-transfer programs, such as LapLink
2000 and PCAnywhere. This cable boosts performance significantly,
especially on systems using ECP or EPP parallel ports.
Direct Connect Software
After you have the hardware in place, you need the proper software
for the two systems to communicate. At one time, you had to purchase
a third-party product (such as LapLink) to do this, but the