50
Operating Instructions – MOVITRAC® B
4
Installing accessories and options – electrical aspects
Installation
Please note:
• Use a 2-core twisted and shielded copper cable (data transmission cable with
braided copper shield). Connect the shield flatly on both sides of the electronics
shield clamp of MOVITRAC
®
. Also connect the ends of the shield to GND. The cable
must meet the following specifications:
– Core cross section 0.75 mm
2
(AWG18)
– Cable resistance 120
Ω
at 1 MHz
– Capacitance per unit length
≤
40 pF/m (12 pF/ft) at 1 kHz
• The permitted total cable length depends on the baud rate setting of the SBus:
– 250 kBd: 160 m (528 ft)
– 500 kBd: 80 m (264 ft)
– 1000 kBd: 40 m (132 ft)
• Connect the system bus terminating resistor (S1 = ON) at the end of the system bus
connection. Switch off the terminating resistor on the other units (S1 = OFF). The
DFP21B gateway must always be connected either at the beginning or the end of the
system bus connection and features a permanently installed terminating resistor.
INFORMATION
• There must not be any potential displacement between the units connected with
the SBus. Take suitable measures to avoid potential displacement, e.g. by con-
necting the unit ground connectors using a separate lead.
• Point-to-point wiring is not permitted.
Summary of Contents for Movitrac B
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