18-04-2014, 11:08 AM
MICROCONTROLLER BASED INTERFACE TO ANALYSE DATA ERRORS IN THE SHIP NETWORK
MICROCONTROLLER BASED INTERFACE.doc (Size: 54.5 KB / Downloads: 12)
ABSTRACT :
In this paper we present how the ship communication takes place. The ship network is a network which is of prime use in communicating inside and outside the ship, it is also used in analyzing data’s of the ship movement, communicating between the equipment’s, initialize or terminate weapon systems or any equipment in the ship. This is efficiently done by Asynchronous Transfer Mode [ATM], this ATM machine is provided by the signal which is obtained by the Network Interface Unit [NIU] and this information in the NIU is obtained by various equipments in the ship network such as general,equipment,status.
INTRODUCTION:
The NIU consists of an interface which can display, configure ports and it can also give the equipment status. This interface is named as Man Machine Interface [MMI]. MMI is based on AISDN [ATM based Integrated Shipboard Data Network]. ATM is an efficient switching and multiplexing technique based on the principle of cell based circuit switching, where the information is sent in the form of cells. It is asynchronous in the sense the recurrence of cells containing information from a particular user is not necessarily periodic. A basic characteristic of the ATM technique is its flexibility in providing bandwidth by statistical multiplexing of different cell streams over the same physical medium. This allows provisioning of interconnections with any requested bit rate.
Hardware design:
Fig. 1 shows how interface takes place. It shows the connection between microcotroller and other devices.
The specifications are:
80C51 Central Processing Unit
Six clocks per machine cycle operation (standard)
12 clocks per machine cycle operation (optional)
Speed up to 20 MHz with 6 clock cycles per machine cycle
(40 MHz equivalent performance); up to 33 MHz with 12 clocks per machine cycle
LIST OF MESSAGES FROM/TO MMI-ANIU
Errors generated by ANIU can be classified under two groups, namely “Errors automatically detected and reset by ANIU” and “Errors generated in Response to Operator action”. The errors automatically detected and reset by ANIU will be stored in memory of MMI and will be displayed when requested by the operator. The errors generated in response to any operator action will be displayed immediately on the screen and will be removed either on operator pressing the “ESC” key or on receipt of a new message from ANIU which needs to be displayed on LCD. Such messages will not be stored in the MMI and no LED/Buzzer would be activated for such messages.
CONCLUSION:
The ship communication is required for various purposes.By installing NIU unit, various messages can be received.This papers covers hardware required and simulator.