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COM128 Installation and Operation Manual Schneider Electric
12
SHLD
SHLD
PORT C
PORT D
PORT B
PORT A
DCE
PORT
DTE
PORT
COM128
RS-232 to RS-485 Converter
RS-232
RS-485
Computer
or Modem
SHLD
PORT C
PORT D
PORT B
PORT A
DCE
PORT
DTE
PORT
COM128
RS-232 to RS-485 Converter
RS-232
RS-485
Computer
or Modem
RS-485 STAR CONNECTION
RS-485 PORT RS-485 PORT
SHLD
SHLD
RS-485 PORT
SHLD
RS-485 PORT
DO NOT
CONNECT
SHLD
SHLD
RS-485 PORT RS-485 PORT
SHLD
SHLD
RS-485 PORT RS-485 PORT
SHLD
SHLD
RS-485 PORT RS-485 PORT
DO NOT
CONNECT
RS-485 T-CONNECTION
3-way star
connection
point not
allowed
Figure 4.3.3a RS-485 Topologies to Avoid