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5.2
Installing the serial communication cable for
RS485 SPA/IEC
1
Where:
1
is cable
2
is screw
Figure 10:
Cable contact, Phoenix: MSTB2.5/6-ST-5.08 1757051
The EIA standard RS-485 specifies the RS485 network. An informative excerpt is given in
tion
5.2.
Informative excerpt from EIA Standard RS-485
Informative excerpt from EIA Standard RS-485 - Electrical Characteristics of Generators and
Receivers for Balanced Digital Multipoint Systems
RS-485 Wire - Media dependent Physical layer
1
Normative references
EIA Standard RS-485 - Electrical Characteristics of Generators and Receivers for Balanced Digital
Multipoint Systems
2
Transmission method
RS-485 differential bipolar signaling
2.1
Differential signal levels
Two differential signal levels are defined:
A+ =line A positive with respect to line B
A- =line A negative with respect to line B
2.2
Galvanic isolation
The RS485 circuit shall be isolated from earth by:
Riso ≥ 10 M Ω
Ciso ≤ 10 pF
Installing the terminal
2
en03000110.vsd
Chapter 5
sec-
39
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