Service Manual

© 2015 680_D - 10/15 10 of 48
Communication Wiring
A Building Automation System (BAS) can be connected to the control for
remote monitoring and adjustment capability. BACnet IP communications
use an ethernet CAT-5E or CAT-6 cable. The maximum recommended cable
length for CAT-5E is 150 feet (45 m) and 300 feet (90 m) for CAT-6.
•
Connect the Ethernet RJ45 plug on the BACnet IP network to the
ethernet RJ45 jack on the 680.
A Building Automation System (BAS) can be connected to the control for remote
monitoring and adjustment capability. BACnet MS/TP and Modbus communications
use an RS-485 connection. Use 18 AWG twisted shielded pair cable. The maximum
cable length is dependent on the baud rate and whether terminating resistors are
installed. Refer to the BAS Integration Manual 680_B for details on the maximum
recommended cable length.
• Connect the B (+) terminal on the BAS network to the RS-485 B (+) terminal 16.
• Connect the A (-) terminal on the BAS network to the RS-485 A (-) terminal 17.
• Connect the ground (G) terminal on the BAS network to the Gnd terminal 18.
RJ45
BACnet
Network
Snow Melting
Control 680
BAG
Master
680
16 17 18
Gnd
+–
RS 485
BA
(+)
(-)
BACnet MS/TP and Modbus Communication -----------------------------------------------------------
BACnet IP Communication -----------------------------------------------------------------------------
Snow/Ice Sensor ---------------------------------------------------------------------------------------
Up to two Snow/Ice Sensor 090 or 094 can be connected to the control. The
090 has a 65' (20 m) cable and the 094 has a 208' (63 m) cable. The cable may
be extended to a total length of 500' (150 m) using 18 AWG cable. Any junction
boxes must kept dry.
If the Snow/Ice Sensor 1 input is used:
• Connect the brown wire to terminal 19.
• Connect the black wire to terminal 20.
• Connect the blue wire to terminal 21.
• Connect the yellow wire to terminal 22.
• Connect the red wire to terminal 23.
If the Snow/Ice Sensor 2 input is used:
• Connect the brown wire to terminal 24.
• Connect the black wire to terminal 25.
• Connect the blue wire to terminal 26.
• Connect the yellow wire to terminal 27.
• Connect the red wire to terminal 28.
Brn/
Slab
19
BluBlk/
Com
20 21
Yel
22
Red
23
Snow/Ice Sensor 1
Brn/
Slab
24
BluBlk/
Com
25 26
Yel
27
Red
28
Snow/Ice Sensor 2