dsPICPRO User
’
s Manual
M I K R O E L E K T R O N I K A S O F T W A R E A N D H A R D W A R E S O L U T I O N S F O R T H E E M B E D D E D W O R L D
25
page
MikroElektronika
Development
tools
dsPICPRO
2.0
USB
R
S
-44
8
5
CC
O
M
M
U
N
IC
A
T
IO
N
RS-485 communication enables point-to-point and point-to-multipoint data trans-
fer. It is commonly used for data transfer between several microcontrollers. LTC485
interface tranciever is used for transforming signal from microcontroller’s Rx and
Tx lines to differential signal on A and B output lines.
RS-485 COMMUNICATION
Figure 26.
RS-485 connector
dsPICPRO development board have one RS-485 communication device. In order to
provide a more flexible system, the microcontroller is connected to the LTC485
through three switches on
SW3
. Switches 2, 3 and 4 are used to connect Rt, Tx and
Rx lines from microcontroller to RS-485 port.
RS-485 connector
Figure 27.
LTC485 and RS-485 connector
LTC485 chip
