ABB Relion 650 Series Commissioning Manual page 28

Section 2
Starting up
20
IP address of the front port, if the front and rear port are set to the
same subnet.
Setting up the PC or workstation for point to point access to IEDs
front port
A special cable is requested 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 null-modem cable or cross-wired cable. The
minimum length should be about 2 m. The connector type is RJ-45, see
IED
IEC09000096 V1 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 requested 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
straight (standard) Ethernet cable can be used.
When a computer is connected to the IED and the setting DHCPServer is set to On
via the LHMI path Main menu/Configuration/Communication/TCP-IP
configuration/1:ETHFRNT/DHCPServer, the IEDs DHCP server for the front
port assigns an IP address for the computer. The computer must be configured to
obtain its IP address automatically as described in the following procedure.
1. Select Network Connections in the PC, see
RJ-45
PCM600
Tx Tx
Rx Rx
Figure
1MRK 511 209-UEN -
Figure
IEC09000096-1-en.vsd
3.
Commissioning Manual
2.
REC650