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Installation
Use 22 AWG, twisted shielded two-conductor or three-conductor cable for network wiring. Network wiring should start
at one controller and go to the next and then go to the next, until the final controller is reached. Wiring is such that all "A"
wires are connected to "A" wires, all "B" wires are connected to "B" wires, and all "REF" wires are connected to "REF" wires.
NOTE:
"A" refers to the negative (–) RS-485 connection and "B" refers to the positive (+) RS-485 connection.
A 120 Ω terminating resistor should be placed at each of the two ends of the network directly across the "A" and "B" wires.
• If the QWL4.1 will be at one end of the network, hard-wire a 120 Ω terminating resistor across the "A" and "B" terminals
of the QWL4.1 (See
Three-Wire Network Wiring on page
• If the QWL4.1 will be in the middle of the network, do not wire in the terminating resistor on the QWL4.1 terminal block
Connect one end (ideally the furthest end from the QWL4.1) of the shield wire of the network wiring to earth ground.
NOTE:
If you encounter time-out errors, contact TCS Technical Support (800.288.9383, ext. 2).
Three-Wire Network Wiring
Follow this wiring diagram for all three-wire systems (this is common).
NOTES:
In the middle of the network, all network wiring shields should be twisted together and taped off to prevent
accidental grounding. More than one ground on the network wiring can result in communication failure.
A maximum of two terminating resistors can be used.
COM 1
REF
B
A
1
COM 1
REF
B
A
REF
A
B
3
Drain
Wire
Shield
A
B
REF
A
B
REF
120Ω
Terminating
4
Resistor
Last in Daisy Chain
A
B
REF
Earth Ground
Only at one end
QWL4.1 at end of the network.
1
2
QWL4.1 in the middle of the
network.
11
11
Shielded, twisted three-conductor
3
communications wiring with one end
earth grounded. (120 Ω balancing
resistors provided.)
Shielded, twisted three-conductor com-
4
munications wiring with one end earth
grounded. (120 Ω balancing resistors
provided.)
2800 Laura Lane • Middleton, WI 53562
11).
COM 1
REF
B
A
2
COM 1
REF
B
A
3
4
|
800.288.9383
|
www.tcsbasys.com
4
NOTES:
1.
If using more than 64 controllers,
use the second RS-485 port or
additional QD1010 adapters.
2.
Each controller must use the
same baud rate and be assigned
a unique address.
Building Automation Systems
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