BIG ASS FANS BAFWorks 3.0, Installation Manual

Page: 30 / 84

BAFWORKS
®
INSTALLATION GUIDE
WWW.BIGASSSOLUTIONS.COM ©2013 DELTA T CORP. ALL RIGHTS RESERVED
24
Modbus wiring overview
The BAFWorks
®
control system utilizes the Modbus RTU protocol to communicate to fans over a two-wire RS-485 network. Each fan or
device requires a unique serial address for the BAFWorks application and Modbus gateway to function properly. The following pages
detail the setup and connections unique to each supported type of fan. Two basic wiring layouts are shown below. The first illustrates
multiple daisy chained drops with the iPad
®
and gateway located on one end of the Modbus loop. The second illustrates the same fan
drop arrangement with the iPad and gateway in a central location. Either scenario will handle up to 32 unique serial addresses.
Powerfoil X Series
Serial Address #1
Powerfoil X Series
Serial Address #2
Basic 6 or Powerfoil8
Serial Address #3
Powerfoil X Series
Max Serial Address #32
iPad/Gateway/
Router Location
Wall-Mounted
Fan Controller
EOL Resistor
Installed
Powerfoil X Series
Serial Address #1
Powerfoil X Series
Serial Address #2
Powerfoil X Series
Serial Address #3
Basic 6 or Powerfoil8
Serial Address #4
Basic 6 or Powerfoil8
Max Serial Address #32
Wall-Mounted
Fan Controller
EOL Resistor
Installed
iPad/Gateway/
Router Location
EOL Resistor
Installed
Modbus cable Modbus cable Modbus cable
Modbus cable Modbus cable Modbus cable
Electrical Installation: Fans (cont.)
Cable types and distances
The maximum total distance for a Modbus loop is 4,000 cable feet (1,219.2 m); however, this may not always be practical. The cable
impedance, load impedance, foreign signal presence, serial baud rate, and number of attached devices will decrease this imum
distance limit. Testing has shown that the control system has a solid signal strength on a 1,000-ft (304.8 m) loop; however, there is no
way to determine the maximum length for a particular application due to the number of variables.
There are a number of acceptable cable types that can be used for installation. On the following pages, Belden cable part number
3106A is used for all examples. It is absolutely critical that the cable used meets TIA/EIA-485 standards for use on RS-485
networks.
Manufacturers that make acceptable cable include Carol
®
, Alpha Wire, Tyco/Raychem
®
, and Belden.
Terminating or EOL resistors
A number of 1/4W, 120-ohm resistors are included in the provided hardware. As illustrated on the following pages, an EOL resistor
must be placed across the MBA and MBB terminals at the last device in a Modbus cable run, even if it is only a single run between the
gateway and a single fan.
Do not assign the same address to two (2) fans.