Emerson ROC 800 Series Network Card Instruction Manual - ROC827

ROC827 Instruction Manual

	Wire	RJ-45 Pins
Pin		on ROC800-
	Color
		Series
4	Red	5
5	Green	3
6	Yellow	2
7	Brown	7
8	Gray	8

5.5.1Using 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.

5.6Ethernet 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.

Issued Mar-06 Communications 5-7