Connecting
6.6 Connecting the PAC RS485 expansion module
SENTRON PAC4200
System Manual, 09/2009, A5E02316180B-02
97
values, use an external bus terminating resistor. Attach this to the first and last
communication node.
&RP %
$
7HU 38 3'
Figure 6-25 Terminal assignment with terminating resistor
NOTICE
Incorrect bus terminator
If you switch more than two bus terminating resistors on one bus, this can result, for
example, in signal reflections that interfere with communication on the bus.
Never attach more than two bus terminators to one bus. Attach one bus terminating
resistor at the start of the bus and one terminating resistor at the end of the bus.
5.
Make sure that there is sufficient strain relief for the connected cables.
Line polarization
A resistor for line polarization is implemented in the terminal block.
&RP %
$
7HU 38 3'
Figure 6-26 Terminal assignment with line polarization
If one or more communication nodes require line polarization, switch a resistor pair PU and
PD on the RS 485 twisted-pair cable in the case of a PAC RS485 expansion module. To do
so, switch on the resistor in the terminal block of the relevant PAC RS485 expansion module
shown in the figure "Terminal assignment with line polarization".
See also
Tools (Page 69)
Installing the expansion modules (Page 74)
Electrostatic sensitive devices (ESD) (Page 273)
Содержание PAC4200
Страница 16: ...Introduction 1 6 Further documentation SENTRON PAC4200 16 System Manual 09 2009 A5E02316180B 02 ...
Страница 66: ...Operation planning 4 1 Operation planning SENTRON PAC4200 66 System Manual 09 2009 A5E02316180B 02 ...
Страница 174: ...Service and maintenance 10 6 Disposal SENTRON PAC4200 174 System Manual 09 2009 A5E02316180B 02 ...
Страница 284: ...Index SENTRON PAC4200 284 System Manual 09 2009 A5E02316180B 02 ...