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Design of RS485 Based Control System for Industrial
device Control
A control system is a device or set of devices to manage,
command, direct or regulate the behavior of other devices or systems.
This project focuses on the benefits of using RS-485 signaling
for industrial device control applications using RS-485
COMMUNICATION. This technology has several benefits for these
applications in term of noise immunity, wide common-mode voltage
range, adequate data rate, and multipoint capability. Other applications
also use RS-485 signaling to take advantage of these same benefits.
Electromagnetic interference (EMI) can corrupt the signal in a
motor control system. In an analog system, noise signals might cause
unwanted motion or instability. Due to the inherent in signal-to-noise
ratio of binary coding, the main concern with digital system is spurious
pulses, which may be interpreted as commands or feedback signals. The
RS-485 signaling is balanced and differential, and is typically
transmitted over twisted wire pairs.
RS-485 interfaces are multi-drop networks up to 4000ft long that
can support up to 256 network nodes depending on which 485
transceiver chips are installed on the controller boards.
Software Requirements:
Keil software,
Flash magic.
Hardware Requirements:
1. 8052 MICROCONTROLLER.
2. RS485 PROTOCOL(SN175N)
3. MAX232
4. BULB.
5. ULN2003.
BLOCKDIGRAM:
PC
A
T
MAX23
2
8
9
S
5
RS485
2
U
L
N
2
0
0
3
RELAY1
DC MOTOR
DC MOTOR
AC DEVICE2
RELAY2
DC MOTOR
RELY3
AC DEVICE3