Connections; Network Topology; Rj 45 Lan, Use Shielded Ethernet Cable - Danfoss AK-SM 850 User Manual

Connections

The following chapter describes the available connections on
your AK-SM 850.
Please note that not all connection points are currently
active, please refer to the drawing below for more details
not currently
used
Power Supply Alarm relay

Network topology

Your AK-SM supports both Modbus and Lon RS485 local bus
connections. For further detailed description of network
connections please refer to document 'Data Communication
between ADAP-KOOL® Refrigeration controllers_RC8AC602'
Lon RS485
Follow standard topology guidelines for Lon RS485, with
particular respect to maximum cable length, when to use a
repeater and ensuring suitable resistors are in place.
Cable type
Cables twisted in pairs must be used, and they may be provided
with a screen. Some types of communication require a cable with
a screen to be used. The conductor's cross section must be at
least 0.60 mm. Examples of cable types:
Belden 7701NH, single-thread 1 x 2 x 0.65 mm, without screen
Belden 7702NH, single-thread 2 x 2 x 0.65 mm, without screen
Belden 7703NH, single-thread 1 x 2 x 0.65 mm, with screen
Belden 7704NH, single-thread 2 x 2 x 0.65 mm, with screen
LAPP UNITRONIC Li2YCY (TP), multi-thread 2 x 2 x 0.65 mm, with
screen
Dätwyler Uninet 3002 4P, single-thread 4 x 2 x 0.6 mm, with
screen
8
Boot switch
(used to place unit in
boot loader mode)

RJ 45 LAN, Use shielded Ethernet cable

User Guide USCO.PI.R1.E1.02 © Danfoss 07-2013
Lit. no.
not currently
Modbus field
bus
Address swicth
(used when configuring
multiple SM units
When using the Lon RS485 network, ensure the
Term. Switch on the AK-SM is in the 'ON' position
(enable internal resistor). Any repeaters must
also have 120 Ohm resistor in place. Finally, en-
sure that the last controller on the network run
also has its end of line on line resistor enabled.
used
Lon (RS485)
field bus
AK-SM 850