AERCO Control System (ACS) - Manual (Page 26)

MC2: 04/23/13 Page 26 of 144
GF-131
AERCO Control System (ACS)
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288
Installation, Operation, and Maintenance Manual
OMM-0081_0D
METHOD B – TERMINATION ACTIVATED AT I/O BOX
Figure 2-7: RS485 (Modbus) Wiring For Benchmark Series Boilers (Sheet 2 of 2)
NOTE
Do not terminate the shields
of the RS485 leads to the
ground (GND) terminal. The
shields must be terminated
at the source ends only.
Connect the shields of the
incoming and outgoing
RS485 leads together.
Connect 120 OHM,
½ Watt resister
between + and –
RS485 terminals on
the LAST C-More
Box.
I/O Board