Gf-131 aerco control system (acs) – AERCO Control System (ACS) User 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