Lennox CMC 020S Installation, Operating And Maintenance Manual page 27

2.- INSTALLATION
2.8.- OPTIONS INSTALLATION
COMMUNICATION CAPABILITIES
1. BMS MODBUS_RS485 connection.
2. BMS LONWORKS_Echelon connection.
3. BMS BACnet connection.
A master-slave connection is possible with version C60 units:
SERIAL
CARD
LAN
Cable c. section (mm2)
3 shielded pairs
AWG24
500m max.
A
DT50
DC60 DS60
BM60 BM60
SERIAL
CARD
CH1
RS485 MODBUS
LON WORKS FTT 10A
BACNET
RS485
RS232
230V
BMS
SERIAL
BM60
CARD
RT1
J11
J10
Cable c. section (mm2)
3 shielded pairs
AWG24
500m max.
C
A
DT50
B
DC60 DS60
BM60
SERIAL
SERIAL
CARD
CARD
CH2
Cable c. section (mm 2 )
two wire S12E racing
from min. 0.2 a max. 2.5 mm 2
AWG 20/22
1000m. max.
SERIAL
BM60
CARD
RT2
J11 J10
Cable c. section (mm2)
3 shielded pairs
AWG24
500m max.
Cable c. section (mm2)
3 shielded pairs
AWG24
500m max.
A
C
DT50
B
DC60 DS60
26
BM60
SERIAL
CARD
CH3
RS485 MODBUS
LON WORKS FTT 10A
BACNET
SERIAL
CARD
BM60
Connect a 120 Ω 1/4 W
terminating resistor,
MODBUS only.
SERIAL
BM60
CARD
RT3
J11 J10
Cable c. section (mm2)
3 shielded pairs
AWG24
500m max.
C A
DT50
B
DC60 DS60
CH4
BM60
RT12
J10
J11
LAN
C
B