ROTRONIC HC2 - Manual (Page 16)

E-M-HC2-accessories_24
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
Accessories and Parts
for probes, indicators and transmitters Instruction Manual
Document Type
Page 16 of 23
Document title
© 2009-2010; Rotronic AG E-M-HC2-accessories_23
7.2.2 Powering the networked devices from the RS-485 main data line
Depending on the model, the devices connected to a RS-485 network can be powered from the main data line
as opposed to each device being powered separately. Please check the instruction manual of each device
.
The AC3011 offers the following options to power devices from the main data line:
a) Power from the same source as the AC3011
This option can be used only when the mA rating of the power supply used for the AC3011 is sufficient to
power both the AC3011 and the networked devices.
b) Power from a separate voltage source
Addr. 1 240
Ω
240
Ω Addr. n
V +
GND
AC3011
Converter
No RS-485
Address
Ethernet
D+
D-
V +
GND
Voltage
Source
Addr. 1 240
Ω
240
Ω
V + GND
Addr. n
Separate
Voltage
Source
AC3011
Converter
No RS-485
Address
Ethernet
D+
D-
GND V +
Voltage
Source
RS-485 Main Data Line (max. 1000 m / 3300 Ft)
RS-485 Main Data Line (max. 1000 m / 3300 Ft)