Rs485 Serial Communication - inout DA 480-R User Manual

4.2 RS485 Serial communication

DA 480-R could be connected via serial port to an RS485 communication bus, to be
controlled by a master system or a computer.
Because of disturbs on the serial line coming from outside, dysfunctions can occur to the
master system with possible harms to the amplifier; to avoid such troubles use the following
precautions:
• Do not put serial cables in the same pipe with power cables or hi-voltage cables. Keep a
safe distance from those cables, at least 10 cm.
• Connect the cable screen to the ground at one end (not both ends); ground connection should
not be made in the same point where hi-voltage circuits are connected to the ground.
• Switch off the whole system before start wiring the serial lines: also missing or parasite
currents could damage the modules.
DA 480-R support multipoint serial communication with the RS-485 electric standard, that
allows to connect up to 32 amplifiers, each one with its own address.
The address is a number that enables the master system to establish the communication with
a specific DA-480 among the several ones connected to the same communication bus.
: during address setting pay attention to not define more than one module
IMPORTANT
with the same number, otherwise communication becomes confuse and irregular and
exchanged data will doesn't make sense.
ADDRESS SETTING ON RS485 BUS
DA 480-R User manual v.1
Page 17