Assembly Instructions 6
• The maximum cable length is 30 m for RS232, and 500 m for
RS422 and RS485.
RS485
According to RS485, resistors are required for resting potential generation at
any places in case of data communication connections, for every 470 Ω
between R/TA and +U and also between R/TB and SGND. Other bus resis-
tors at every 120 Ω between R/TA and R/TB on both the physical ends of the
cable are recommended for cable length from 200 m onwards.
Ethernet
A standard type of cable is recommended for data communication connec-
tion via Ethernet according to Category 5 (Cat 5), the maximum cable length
is 100 m.
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