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NetSure™ ITM with eSure™ Technology
Installation Manual, Section 6040 (Issue AB, April 8, 2013)
Spec. No: 582145500
35
Section 6040
Model: NetSure™ ITM Issue AB, April 8, 2013
4.6 Making Alarm/Control Interconnections between Modules
(if system consists of multiple DC UPS modules)
Make the following module-to-module alarm/control interconnections as required. Refer to Figure 23
for an interconnect diagram. See also the Cabinet Interconnections illustration in Figure 24,
Figure 25, and Figure 26.
4.6.1 RS-485 Module-to-Module Interconnect
Primary Module to 1st Expansion Module (Skip if No 1st Expansion Module)
1. Locate the long RS-485 interconnect cable (RPM 628 415/2) (yellow/white wire twisted pair) coiled
up on the right side of the Primary Module.
2. Route this cable through the openings in the sides of the cabinets to the 1st Expansion Module.
3. Connect this cable to the mating RS-485 interconnect cable connected to the SM-AC located in the
1st Expansion Module (yellow/white wire twisted pair).
1st Expansion Module to 2nd Expansion Module (Skip if No Additional Expansion Module)
1. Locate the long RS-485 interconnect cable (RPM 628 415/2) (yellow/white wire twisted pair) coiled
up on the right side of the 1st Expansion Module.
2. Route this cable through the openings in the sides of the cabinets to the 2nd Expansion Module.
3. Connect this cable to the mating RS-485 interconnect cable connected to the SM-AC located in the
2nd Expansion Module (yellow/white wire twisted pair).
Additional Expansion Modules (Skip if No Additional Expansion Module)
1. Make similar connections between each adjacent Expansion Module.
SM-BRC RS-485 Termination Resistor Setting in Last DC UPS Module
1. A jumper on the SM-BRC circuit board is used for selecting a termination resistor for the RS-485
connection. RS-485 termination is disabled when the jumper is across pins 1 and 2 (default). It is
enabled when the jumper is across pins 2 and 3. See Figure 22 for the location of the jumper.
In most cases, RS-485 termination is not necessary because maximum baud rate is 19200 bps
(default is 9600). RS-485 termination is recommended when intermittent communications occur.
If there are intermittent communications errors, it is recommended to set the termination resistor
on the SM-BRC in the last module to the enabled position (jumper between pins 2 and 3) instead
of the factory disabled position (jumper between pins 1 and 2).
Figure 22 SM-BRC RS-485 Jumper Locations
4.6.2 CAN-Bus Module-to-Module Interconnect
CAN-Bus End Resistor (move only if more than one DC UPS module)
1. Locate the short CAN-Bus interconnect cable jumper connected to the SM-DU+ in the Primary
Module (black/white wire twisted pair located behind the SM-DU+ sheetmetal enclosure and