Power Measurement 3300 ACM - Page 25

3300 ACM Installation and Operation Manual Power Measurement Ltd. 2-14 Installation Figure 2.6.2 RS-485 Communications Connections
SHLD
RS-485 PORT RS-485 PORT
RS-485 PORT RS-485 PORT
SHLD
3300 ACM
Base Module
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
RS-485 Cable
AWG 22 shielded twisted pair. Overall length: 4000 ft. maximum.
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
SHLD
+
_
SHLD
+
_
SHLD
+
_
SHLD
+
_
SHLDSHLD
+
_
+
_
3300 ACM
Base Module
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
RS-485 Cable
AWG 22 shielded twisted pair. Overall length: 4000 ft. maximum.
SHLD
R
T
SHLD
Termination Resistor
Last
RS-485 Device
(End Point)
Last
RS-485 Device
(End Point)
R
T
Termination Resistor
SHLD
+
SHLD
+
3300 ACM
Base Module
RS-485 PORT
+
SHLD
3300 ACM
Base Module
RS-485 PORT
SHLD
+
_
SHLD
+
_
+
_
_
_
_
Computer or
Modem
PORT
RS-485
RS-232C to RS-485 Converter
RS-232C
PORT
RS-485
RS-232C to RS-485 Converter
RS-232C
Computer or
Modem
LOOP TOPOLOGY
STRAIGHT-LINE TOPOLOGY
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
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