LAARS X-BAC User Manual
Installation and Operation Manual
Adds BACnet MSTP Capability
Document 4233
X-BAC
to Laars M4-LHS Controls
PWR
L
N
1
2
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL
FOR ALL CIRCUITS
INPUT RATINGS:
115VAC 60Hz , 30VA MAX
USE COPPER WIRE,
CLASS 1 WIRE ONLY.
ENCLOSED
ENERGY
MANAGEMENT
EQUIPMENT
99RA
CAUTION
: RISK OF ELECTRIC SHOCK
More than one disconnect switch may be required
to de-energize the equipment before servicing.
SYS
A
B
C
5
3
6
4
7
8
9
10
11
D
12
M4-LHS
A
B
C
D
A
B
CUR / VLT
CUR / VLT
GND
mA
VLT
GND
mA
-
-
+
+
+
13
15
16
14
17
RUNPROGRAM
C
CUR / VLT
VLT
GND
mA
-
+
+
18
19
20
HYBRID CONTROL
D
CUR / VLT
VLT
GND
mA
mA
VLT
-
+
+
+
+
23
21
22
24
DO NOT APPLY ANY VOLTAGE
TO INPUT TERMINALS
OUTDOOR
SYSTEM
PROVE
TEMP
TEMP
/DHW
T
O
T
O
O
25
26
28
29
27
30
SHUTDOWN
/TSTAT
/SETBACK
31
O
32
EXTENSION
MODULE
RS-485
BACnet Interface Module
X-BAC
BACnet Interface Module
MSTP
A GND B
1 2 3
B (-)
A (+)
Ground
To BACnet
MSTP
PRODUCT
COMM
RS485
WARNING
This control is strictly an operating control; it should never be
used as a primary limit or safety control. All equipment must have
its own certified limit and safety controls required by local codes.
The installer must verify proper operation and correct any safety
problems prior to the installation of this control.
RJ45 Communication Cable
HT# 059294-00 B
CONTENT
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Item List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
BACnet MS/TP Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Connecting to Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Connecting to Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
BACnet Startup Menu Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
BACnet Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
BACnet Baud Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
MS/TP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
BACnet ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
No LED Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
No Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Specication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Wiring to Control and Extension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
HT# 059294-00 B
2
X-BAC BACnet Interface Module Installation and Conguration Manual
OVERVIEW
BACnet Interface Module
PRODUCT
COMM
RS485
X-BAC
MSTP
The BACnet Interface Module adds BACnet MS/TP communication capability to the M4-LHS control. It does that by connecting
to both, the control and the BACnet MS/TP network. All the BACnet settings are congured through the control. The BACnet
Interface Module has LEDs that can help in displaying communication status.
X-BAC
BACnet Interface Module
RS485
to EMS
MSTP
A GND B
1 2 3
Operation
LEDs
PRODUCT
COMM
RJ45
Communication
RS485
Mounting
Tab
RJ11
to Extension
to Control
ITEM LIST
• X-BAC BACnet Interface Module,
• RJ45 cables (Ethernet Cable),
INSTALLATION
The BACnet Interface Module communicates with the M4-LHS control using the RJ45 cable. Thus, it needs to be installed in close
proximity to the control.
• Mount the BACnet Interface Module on a at surface next to the control.
• The module can be mounted horizontally or vertically.
• Keep the module away from extreme heat, cold, or humidity.
• Screw the module to the at surface using the two side tabs with holes.
• No need to remove the BACnet Interface Module cover.
WIRING
• No power wiring is required for the BACnet Interface Module. It gets its power through the control's
RJ45 connection.
• The module's MS/TP terminals are of the removal type. That facilitates easy wiring. Just unscrew the
terminal block side screws to remove the full terminal block.
BACNET MS/TP WIRING
• Use 18# AWG Twisted Pair cable. The cable length must not exceed 3500 feet.
• Connect the MS/TP cable coming from the BACnet MS/TP network to the MS/TP terminals on the
BACnet Interface Module. Communication on the BACnet MS/TP network is polarity sensitive.
• The ground terminal (GND) MUST be connected to the BMS Ground.
X-BAC BACnet Interface Module Installation and Conguration Manual
MSTP
A GND B
1 2 3
B (-)
A (+)
Ground
To BACnet
HT# 059294-00 B
3
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