JOHNSON CONTROLS
51
FORM 450.50-N1
ISSUE DATE: 08/19/2019
INSTRUCTIONS FOR THE BAS CONTRACTOR
Setting the MAC Address
The SC-EQ Communication Card Media Access Con-
trol (MAC) network hardware address is set on a single
8-way DIP switch. Switch 8 is not used. The switches
are binary weighted allowing the setting of addresses
from 1 to 127.
Once the DIP switches are set for the correct MAC ad-
dress, cycle the power to the SC-EQ by momentari-
ly unplugging the 24 VAC or +12 VDC power plug
(depending upon how the SC-EQ is being powered).
The SC-EQ Communication Card then boots up and
establish communications. This may take up to 120 s.
NOTE: The information below can be shared with the technician responsible for the BAS network.
The SC-EQ Communication Card has the ability to au-
tomatically determine the BAS network protocol and
communication parameters and set its communication
parameters to match the installed BAS system.
If the chiller was already commissioned, there is no
need for a chiller technician to return to the site to con-
nect the BAS wiring and set the MAC address since
these are standard tasks that a BAS contractor routinely
performs.
The instructions on this page assist you with these
steps.
BAS Wiring Connections
The BAS port J12 is the blue pluggable connector
shown below. It is an RS-485 port with + - COM and
SHLD marked. The SHLD (shield) terminal is not con-
nected to any circuitry or ground and provides a con-
venient location to connect the shields of two daisy-
chained segments. On some BAS systems the COM is
called REF.
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