1-981-2180-GB, 2021-03-16 BCR-SD G2 Page: 15
SystemHouse Solutions
5.2.2 Line termination
SW1 CR RS485 termination
RS485 bus terminated
No termination
For RS485 termination must be On at beginning and end of line only, all other devices must have it
Off.
SW1 RS485 Termination
5.2.3 Recommended cable
Maximum length of RS485 line can be up to 1000 meters from the first to last unit on the bus.
Always use twisted pair cables, and we always recommend the use of shielded cable for connecting
card readers.
NOTE:
ALWAYS calculate total power consumption and choose a cable with conductor cross-sectional
area designed for that total power consumption.
ALWAYS calculate voltage drop before selecting cable.
5.2.3.1 PTS-HF-2x2x0.6
We always recommend screened, twisted pair cables, type PTS-HF-2x2x0.6 for RS485 lines.
A screened cable is considerably more difficult to wiretap than an unscreened cable.
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