
5 Transferring Project Files
30 Siemens Energy & Automation, Inc.
Before using these commands, you must physically
connect Port 3 of the DTU3005P to your computer
using a null modem cable. Be sure that power is
supplied to the DTU3005P.
For the null modem cable, pins 2 and 3 (RXD and
TXD) must be crossed. On the computer end of the
cable, pins 7 and 8 (RTS and CTS) should be con-
nected together. Pins 1, 4, and 6 (DCD, DTR and
DSR) should be connected together. The cable dia-
gram is illustrated below in Figure 5.2.
Figure 5.2 Null Modem Cable Connection
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