06/05/13
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526- 0288
Page
73
of
112
GF-115-C
Modulex E8 Controller and BCM
Operations and Maintenance Manual
OMM-0084_0D
Figure
7
-11
.
EMS
/BAS Master Controlling Modulex Boiler Slaves
TO OTHER NETWORK
BOILER SLAVES
(3
-
9
)
(SEE NOTE
3
)
EMS MASTER
T
+/
R
+
T
-/
R
-
RS485
PORT
SHIELD
+
Y
2
-2
–
MODBUS “A”
(-
)
(PART OF BCM CONN
.
Y
2
)
MODULEX BOILER SLAVE
#
1
NOTES
:
1
.
IF EMS MASTER CONTAINS A
4
-WIRE RS
485
PORT
,
TIE THE TWO POSITIVE
(+)
AND NEGATIVE
(-
)
LEADS TOGETHER AS SHOWN IN DETAIL “A”
2
.
IF EMS MASTER CONTAINS ONLY A RS
232
PORT
,
A RS
232
-TO
-RS
485
CONVERTER WILL BE
REQUIRED
.
3
.
THE LAST BCM SLAVE ON THE RS
485
LOOP
MUST HAVE ITS TERMINATION RESISTOR
ENABLED
.
ALSO
,
A
1
K OHM BIAS RESISTOR
MAY BE REQUIRED
.
CHECK WITH THE EMS
MANUFACTURER
.
SEE NOTES
1
&
2
DETAIL “A”
(SEE NOTE
1
)
T
+
T
-
4-WIRE RS
485 PORT
SHIELD
R
+
R
-
T
+/
R
+
T
-/
R
-
Y
2
-1
–
MODBUS “B”
(+)
BCM
+
Y
2
-2
–
MODBUS “A”
(-
)
(PART OF BCM CONN
.
Y
2
)
MODULEX BOILER SLAVE
#
2
Y
2
-1
–
MODBUS “B”
(+)
BCM
Fi
gur
e
7
-1
1
:
