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Connection
6.5 Connecting to the RS 485 bus
SENTRON PAC3100
50
Manual, 07/2009, A5E02385159B-01
Grounding of the cable shielding
The serial Modbus data line must be shielded. The shielding must be connected to protective
ground at one end of the cable. The shielding is grounded at one end only.
Grounding of the common line
The common line must be applied direct to protective ground, preferably at only one point for
the whole bus.
Polarization
The PAC3100 does not support polarization of the RS 485 data lines. Polarization must be
implemented at another point on the bus. The master device usually performs the
polarization.
We recommend polarization with supply of 5 V DC, pull-up resistor with 560 Ω, pull-down
resistor with 560 Ω.
Bus terminator
The first and last node in the bus segment must terminate the bus with a terminating resistor.
The PAC3100 does not support bus termination. The bus can be terminated using an
external resistor ≥ 60 Ω. The resistor must be connected to terminals -/A and -/B of the
RS 485 terminal block.
Figure 6-13 Bus termination using external resistor
Содержание SENTRON PAC3100
Страница 10: ...Table of contents SENTRON PAC3100 10 Manual 07 2009 A5E02385159B 01 ...
Страница 38: ...Mounting 5 3 Deinstallation SENTRON PAC3100 38 Manual 07 2009 A5E02385159B 01 ...
Страница 100: ...Parameterizing 9 2 Parameterizing the operator interface SENTRON PAC3100 100 Manual 07 2009 A5E02385159B 01 ...
Страница 104: ...Service and maintenance 10 5 Disposal SENTRON PAC3100 104 Manual 07 2009 A5E02385159B 01 ...
Страница 118: ...Dimensional drawings SENTRON PAC3100 118 Manual 07 2009 A5E02385159B 01 ...
Страница 142: ...Appendix A 3 Correction sheet SENTRON PAC3100 142 Manual 07 2009 A5E02385159B 01 ...
Страница 146: ...List of abbreviations C 1 Abbreviations SENTRON PAC3100 146 Manual 07 2009 A5E02385159B 01 ...
Страница 148: ...Glossary SENTRON PAC3100 148 Manual 07 2009 A5E02385159B 01 ...
Страница 152: ...Index SENTRON PAC3100 Manual 07 2009 A5E02385159B 01 152 ...