SCADA
DATA ACQUISTION MODULE
Group 6
Project Guide: M. Srinivas
AGENDA



Project Definition and Scope
Functionality
Protocol Design
Project Definition & Scope

Gets the data from a field device
(RTU) in digital form (bytes)
• A convenient protocol agreed upon by
both RTU and MTU
Project Definition & Scope
MTU
I
N
T
E
R
F
A
C
E
(Master terminal unit)
Serial Port Comm
Common Protocol
I
N
T
E
R
F
A
C
E
RTU
(Remote terminal unit)
Components

2 Main components
• RTU


RTU Simulator – To generate various analog
and digital values
RTU Interface – Communicates with the
MTU through a common protocol
• MTU

MTU Interface – Communicates i.e. receives
data and sends control commands to RTU
Functionalities of MTU


Initialization of RTU
Requests
• Analog
• Digital
• Health check


Control commands
Time stamping
Protocol

Request Packet from MTU
Start Byte
Request Types
RTU number
Request
CRC
1- Analog
2- Contacts
3– Health
4- Ack for Cont
Protocol (cont…)

Response to Analog Request
Start Byte
RTU no
Length
Analog 1
Analog
. 2
.
.
Analog 14
Time Stamp(2bytes)
CRC
Protocol (cont…)

Response to Digital Request
Start Byte
RTU no
Length
Contact add (1–15)
Status (0/1)
Time Stamp
. (2 bytes)
.
Contact add (1–15)
Status (0/1)
Time Stamp (2 bytes)
CRC
Protocol (cont…)

Response to Health Request
Start Byte
RTU number
CRC
Protocol (cont…)

Control Packet from MTU Select
Start Byte
Request Types
RTU number
Request
Contact Addr
CRC
5- Control com
Protocol (cont…)

Check Response
Start Byte
RTU no
Length of Bytes
Contact add (1–15)
Status (0/1)
CRC
Protocol (cont…)

Control Packet from MTU - Execute
Start Byte
Request Types
RTU number
Request
Contact Addr
Status (0/1)
CRC
6- Execute
Summary

Design of Protocol that supports
• Requests – Analog & Digital values
• Health Check
• Control Commands
• Time Stamping
Thank you
Group Members:
Aravind M
Hemanth Chowdary
Sandeep Reddy M
Sireesh Reddy K
Venkat Ram
(aravind_m@students)
(hemanth@students)
(sandeep_m@students)
(sireesh_k@students)
(ram@students)