AERCO Modbus Communications Manual - Manual (Page 59)

Chapter 4
MODBUS
Communication GF-114
Hardware Setup & Installation USER MANUAL OMM-0035_0C
05/18/12 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288 Page 59 of 200
RS232
PORT
JP5 JP6
P/O MOTHERBOARD
BMS SLAVE
EMS
MASTER
RS
232
RS
232
RS485 TO
BOILERS
RS485
PORT
RS485
OUT
RS232
IN
TERMINAL
BOARD
RS232
PORT
JP5 JP6
P/O MOTHERBOARD
BMS SLAVE
EMS
MASTER
RS
485
RS
232
RS485
PORT
RS485
OUT
RS232
IN
TERMINAL
BOARD
RS485-TO-
RS232
CONVERTER
EMS RS232 PORT TO BMS RS232 PORT
EMS RS485 PORT TO BMS RS232 PORT USING EXTERNAL CONVERTER
RS485 TO
BOILERS
(50 FT. MAX.)
(4000 FT.
MAX.)
(1) (2)
(1) = 4000 FT. MAX.
(2) = 50 FT. MAX.
(4000 FT.
MAX.)
NOTE:
RS232 WIRING CAN BE
CONNECTED TO EITHER THE
EXTERNAL DB9 PORT OR THE
INTERNAL RS232 CONNECTOR,
BUT NOT BOTH
Figure 4-3: EMS Master-To-BMS Slave Connection Diagrams (Sheet 1 of 2)