70 GE INFORMATION D400 SUBSTATION GATEWAY INSTRUCTION MANUAL
CHAPTER 4: CONNECTING TO DEVICES AND NETWORKS
The local HMI connection through the USB KVM card supports two simultaneous terminal
sessions
• tty1 is for the HMI session
• tty2 is for the D400 command line interface
The local HMI connection defaults to the HMI session (tty1) when you log in.
To switch the terminal session at the D400#>> command prompt:
• To the command line interface (tty2) at the D400#>> command prompt, press Ctrl-
Alt-F2.
• Back to the HMI session, press Ctrl-Alt-F1.
For information on accessing the D400 command line interface, see the Setting Up a
Terminal Session topic in the D400 online help.
Front maintenance port
The serial communications port on the front panel of the D400 provides a local connection
with the D400 to perform the initial setup of the D400 and to carry out maintenance and
diagnostic procedures. The front maintenance port provides for a direct serial connection
to a PC using a serial null modem cable (GE Item No. 977-0529), which is supplied with the
D400.
See “Start the D400” on page 89 for more information on setting up communications
with the D400.
To connect your
computer to the D400
Connect the supplied serial null modem cable (GE Item No. 977-0529) to your computer’s
serial communications port and to the D400's front serial communications port.
Figure 42: Front serial port
Minimal required connection
The minimal cable connection required to establish successful communication between
your PC and the D400 is as follows:
PC Pin # 9-Pin Female D400 Pin # 9-Pin Female (w/o Converter) Signal Acronym
2 3 TXD
3 2 RXD
5 5 GND
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