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COM128 Installation and Operation Manual Schneider Electric
10
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
RS-485 Cable
AWG 22 shielded twisted pair. Overall length: 4000 ft. maximum.
Computer
or Modem
SHLD
SHLD
SHLD
RS-485 PORT RS-485 PORT
SHLD
SHLD
RS-485 PORT
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
R
T
RS-485 Cable
AWG 22 shielded twisted pair. Overall length: 4000 ft. maximum.
Last
RS-485 Device
(End Point)
Last
RS-485 Device
(End Point)
Computer
or Modem
SHLD
SHLD
SHLD
SHLD
R
T
RS-485 STRAIGHT-LINE TOPOLOGY
RS-485 LOOP TOPOLOGY
RS-485 PORT RS-485 PORT
RS-485 PORT
RS-485 PORT RS-485 PORT
RS-485 PORT
RS-485 PORT RS-485 PORT
RS-485 PORT
SHLD
SHLD
Termination Resistor
See Section 4.3.3.
Termination Resistor
See Section 4.3.3.
Figure 4.3.3a RS-485 Straight-Line and Loop Topologies