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5.3
Installing the serial communication cable for
RS485 SPA/IEC
Data on RS485 serial communication module cable
Type:
Twisted-pair S-STP (Screened – Screened Twisted Pair)
Shield:
Individual foil for each pair with overall copper braid
Length:
Maximum 100 m from one system earth to the next system earth (includes length
from platform point to system earth on both sides)
Temp:
According to application
120 Ω
Impedance:
Less than or equal to 42 pF/m
Capacitance:
Example:
Belden 9841
Chapter 5
Installing the terminal
41
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