Specifications

Riverside Hydronics
®
, LLC WWW.RIVERSIDEHYDRONICS.COM 34-151 06/2014
3220 Galvez Avenue - Fort Worth, Texas 76111 - Tel [phone] Page | 5
The RS485 serial line applied to the OnTrac is a “Two Wire” electrical interface in accordance with the
EIA/TIA-485 standard. On such a 2 wire-bus, at any time only one driver has the right for transmitting. A
third conductor is to provide shielding and a common ground for the system. A balanced twisted pair
with shield is recommended. AWG26 or larger can run up to 1000m. It is recommended that the RS485
serial line be run separately from any other electrical wiring in order to minimize electric interference.
• Connect the positive wire to the + terminal on
the field connection terminal strip.
• Connect the negative wire to the – terminal on
the field connection terminal strip.
• Connect the common ground and shield to the
G terminal on the field connection terminal
strip.
• Connect earth ground to ground lug.
Ontrac
+ - G
TempTrac TempTrac
-
+
-+
XJ485 SERIAL INTERFACE
2 WIRE TWISTED PAIR
WITH SHIELD
SHIELD
W
IRING RS485 COMMUNICATION WIRE
S