Cable length
A cable length must not exceed 1200 m (4000 foot). A repeater
(Part # 084B2241 ) must be used for longer lengths.
Lon RS485 Topology
The cable connection must be connected from controller to
controller, and no branches are allowed on the cable. If the cable
length exceeds 1200 m a repeater must be inserted. If the data
communication cable runs through an electrically noisy environ-
ment which impairs the data signal, one or more repeaters must
be added to stabilise the signal.
When conguring Lon devices on the control bus, the
highest device address that can be can be used is 127 (max. 120
controller in total)
Conductors
The two wires are looped from device to device. There are no
polarisation requirements. (On some controllers, the clamps are
designated A and B. On others there is no designation. Otherwise
the connections are identical.) If a screen is used, it must be
connected to the system device and any repeaters. A screen must
always be looped from device to device.
The screen must not be connected to anything else.
(The screen is earthed inside the screen and must not be earthed
in any other way.)
AK-SM
AK-SM
AK-SM 850 User Guide Lit. no. USCO.PI.R1.E1.02 © Danfoss 07-2013 9
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