Setting up the PC or workstation for point-to-point access to IEDs front port
A special cable is needed to connect two physical Ethernet interfaces together without a
hub, router, bridge or switch in between. The Tx and Rx signal wires must be crossed in
the cable to connect Tx with Rx on the other side and vice versa. These cables are known
as cross over cables. The maximum length is 2 m. The connector type is RJ-45.
IEC09000096-2-en.vsd
Tx Tx
Rx Rx
RJ-45
IED
PCM600
IEC09000096 V2 EN
Figure 2: Point-to-point link between IED and PCM600 using a null-modem cable
The following description is an example valid for standard PCs using Microsoft Windows
operating system. The example is taken from a Laptop with one Ethernet interface.
Administrator rights are required to change the PC communication setup.
Some PCs have the feature to automatically detect that Tx signals from the
IED are received on the Tx pin on the PC. Thus, a straight (standard)
Ethernet cable can be used.
When a PC is connected to the
IED and the setting DHCPServer is set to Enabled via the
local HMI path Main menu/Configuration/Communication/TCP-IP configuration/
ETHFRNT:1/DHCPServer, the IEDs DHCP server for the front port assigns an IP
address for the PC. The PC must be configured to obtain its IP address automatically as
described in the following procedure.
1. Select Search programs and files in the Start menu in Windows.
Section 3 1MRK 505 293-UUS A
Starting up
24
Commissioning manual
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