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CONNECTIONS
3
CAUTION
To configure the STARGATE™ base station use the cable and the
adapter listed in par. 3.1. For further details see par. 4.3.
The RS485 bus system and the eventual power are propagated from one base
station to another through a cable having the following minimum characteristics:
− 2 twisted pair AWG 24 wire
− Impedance: 120 Ω
− Propagation velocity: 66%
− Capacitance between two connectors: 49 pF/m
− Conductor resistance: 0.8 Ω/m
− Maximum length: 1200 m
Pinout
The custom cables to be used in the RS485 connection have two RJ45 connectors
(see Figure 5).
The cable connecting the first base station to the RS232/RS485 converter has the
following pinout:
6
7
RJ45
2
1
RJ45
CONVERTER
side
STARGATE™
side
Twisted Pair
RS485+
RS485-
3 5
VDC-
Figure 9 - Converter/STARGATE™ Custom Cable Pinout
11