Emerson ROC827 - Manual (Page 99)

ROC827 Instruction Manual
Issued Mar-06 Communications 5-7
Pin
Wire
Color
RJ-45 Pins
on ROC800-
Series
4 Red 5
5 Green 3
6 Yellow 2
7 Brown 7
8 Gray 8
5.5.1 Using the LOI
1. Plug the LOI cable into the LOI RJ-45 connector of the ROC827.
2. Connect the LOI cable to the D-Sub 9 pin (F) to RJ-45 modular
converter.
3. Plug the modular converter into the COM Port of the personal
computer.
4. Launch ROCLINK 800 software.
5. Click the Direct Connect icon.
6. Configure communications for the other built-in and modular
communications, I/O modules, AGA meter parameters, and other
configuration parameters.
5.6 Ethernet Communications
The Ethernet communications port in the ROC827 allows TCP/IP protocol
communications using the IEEE 802.3 10Base-T standard. One
application of this communications port is to download programs from
DS800 Development Suite Configuration Software.
The Ethernet communications port uses a 10BASE-T Ethernet interface
with an RJ-45 connector. Each Ethernet-equipped unit is called a station
and operates independently of all other stations on the network without a
central controller. All attached stations connect to a shared media system.
Signals are broadcast over the medium to every attached station. To send
an Ethernet packet, a station listens to the medium (Carrier Sense) and
when the medium is idle, the station transmits the data. Each station has an
equal chance to transmit (Multiple Access).
Access to the shared medium is determined by the Medium Access
Control (MAC) mechanism embedded in each station interface. The MAC
mechanism is based on Carrier Sense Multiple Access with Collision
Detection (CSMA/CD). If two stations begin to transmit a packet at the
same instant, the stations stop transmitting (Collision Detection).
Transmission is rescheduled at a random time interval to avoid the
collision.