Page 140
– Bulletin 100-50-9.1
21.4 BUILDING AUTOMATION SYSTEM
The S3C Case controller can be integrated into the BAS
network using CAT5 Ethernet or RS-485 Serial line. If CAT5
is used, the cable must be connected to either port 1 or
port 2 on the case controller; whichever is open. If RS-485
is used, the twisted pair cable must be connected to the
RS-485 input on the case controller. In both instances, the
controller must be configured thru software to support the
correct networking option. This is described below.
21.4.1 BAS USING RS-485 SERIAL
INTERFACE
In this configuration, the cases must be connected using
CAT5. Each line-up on the subnet should also be connected
using a CAT 5 cable. A single twisted pair cable must be
used between ONE case controller (per subnet) and the
BAS. ‘Gnd” on the controller must remain open. Take note
to trim excess drain wire and foil shield from the cable at the
S3C controller side. The shield must be tied to earth ground
on the BAS side. A subnet is a set of cases that are networked
together that connect thru a single port on the BAS unit.
21.4.2 CONFIGURE THE SOFTWARE TO
SUPPORT MODBUS OVER RS-485 TO
THE BAS
1. From the
default
display, press the
button. The
display will show
.
2. Use the
▲▼
buttons to enter the
administrator
password and press
SET.
3. The display will show
(will skip to Process Values
if system is self-contained).
4. Press the
SET
button and
(Process Values) will be
displayed.
5. Use the
▼
button and scroll to
Ne
(network
configuration); press
SET.
6. Use the
▲
button and scroll to
(building
automation); press
SET.
7. Scroll to
e
; press
SET.
8. Use the
▲
button and scroll to
(building
automation protocol); press
SET.
Line-up 1
Line-up 2
RS-485
to BAS
Note: Line-ups that are on the same subnet may use this configuration.
Additional subnets may be added to additional ports on the BAS.
Case 1
Case 2
Case 8
Case 1
Case 2
Case 8
Trim foil Shield and
Drain Wire
Leave Gnd Open
