Table of Contents
Advertisement
Installation
Two-Wire Network Wiring
Follow this wiring diagram for two-wire (Modbus) wiring systems (this is not common).
COM 1
REF
B
A
1
COM 1
REF
B
A
REF
A
B
Shield
A
B
A
B
120Ω
Terminating
Resistor
Last in Daisy Chain
A
B
Earth Ground
Only at one end
Two-wire diagram
QWL4.1 at end of the network.
1
2
QWL4.1 in middle of the network.
12
12
3
Drain
Wire
4
Shielded, twisted two-conductor
3
communications wiring with one end
earth grounded. (120 Ω balancing
resistors provided.)
4
Shielded, twisted two-conductor com-
munications wiring with one end earth
grounded. (120 Ω balancing resistors
provided.)
2800 Laura Lane • Middleton, WI 53562
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 control-
lers, 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
Advertisement
Table of Contents
