RCS TR60 User Manual

DCN 140-01761-01 3/21/09 5
RS485 Network Connection
The RS485 communications port is a 2 wire (D+ and D –) plus ground, half-duplex network connection.
Wiring options are direct to a host com port or wired to a RCS RS485 hub to allow star or homerun wiring.
RS485 Wiring Methods
The HVAC Control Unit can be wired by three methods:
1. Direct connection to RS485 Host com ports (as above)
2. Multi-drop (daisy chained) to other thermostats/devices
3. Homerun wired to an RCS Star Wiring Hub.
Multi-drop Wiring
Star Wiring Hub
CommStar Model CS308 or
Model 8AH485 8 Channel Star RS485 Hub
Each TR60 HVAC Control Unit is homerun wired to the Star Wiring Hub
RS485 Wiring Note
Always wire + to + and – to –, regardless of the D+/ D- or A/B or TX/RX labels.
Host System
RS485 port
Up to 4000 ft
12V
Gnd
D+
D -
HVAC Control Unit
Gnd
D+
D -
RS485
12V
Gnd
D+
D -
Gnd
D+
D -
RS485
Gnd
D+
D -
RS485
Gnd
D+
D -
RS485
100 ohm line
termination resistor
recommended on
last device (>100ft)
Host System
RS485 port
RS485 Port
RS485 Port
RS485 Port
RS485 Port
RS485 Port
RS485 Port
RS485 Port
RS485 Port
HVAC Control Unit
RS485 Port
HVAC Control Unit
RS485 Port
HVAC Control Unit
RS485 Port
HVAC Control Unit
RS485 Port
Cat 5 cable recommended
Cat 5 cable recommended

RCS TR60 Specifications

General

Brand	RCS
Model	TR60
Category	Thermostat
Language	English