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3.10.2 Com Ports 1 and 2
Com Ports 1 and 2 are serial communication ports that (through a null modem cable) can be used to
communicate to other serial communication devices. Com Port 1 is the only serial communications port that
can be used with the automation computer (see Section 3.13). A standard null modem cable can be used to
connect Com Port 1 or 2 to another serial device such as a printer or a PC. Figure 3–15 and Figure 3–16
show the pin-outs for a null modem cable. See Section 5.4.2.8 to configure the Com Port 1 and Com Port 2.
Note: Com Port 1 and 2 are for ancillary use only. For UL applications, device(s) connected to either of these
ports must be installed in the same room as the receiver.
3.10.3 Remote Alert Output
1. Plug the Battery/Relay wiring harness onto the connector on the back of the MX8000 receiver. (See
Figure 3–10.)
Note: The remote alert output is a form C relay with a normally open or a normally closed wire.
2. Connect the white wire to common.
EXTERNAL
BATTERY
Figure 3–10: MX8000 Remote Alert Output/Backup Battery Connection
3. Use the Yellow wire for a normally closed circuit
Or
Use the Brown wire for a normally open circuit.
3.11 AC Power Cord Connection
1. Connect the appropriate end of the power cord into its receptacle on the back of the MX8000.
2. Plug the three-pronged end of the power cord into a 120 VAC 60 Hz outlet (three-prong type only). The
outlet should be unswitched, so that power remains on 24 hours a day. The outlet must also be earth
grounded. Follow the directions in Section 3.11.2 if you need to measure for proper earth grounding.
3.11.1 Switching to a 240 VAC Power Supply
1. Remove the front plate by unscrewing the front plate retaining screws. (See Figure 3–1 for locations of
front plate retaining screws.)
2. Disconnect AC power cable.
B
UNUSED
B+
RELAY N.O.
RELAY COM.
RELAY N.C.
REMOTE
ANNUNCIATOR
Black: Battery Negative
Red: Battery Positive
120 VAC ± 10%
240 VAC ± 10%
50-60 Hz
FUSE
100 VA
2.5A
SLOW BLOW
WARNING!
REPLACE ONLY
HIGH VOLTAGE PRESENT
WITH A FUSE
DISCONNECT AC LINE AND
OF SAME TYPE
ALL OTHER CONNECTORS
PROIR TO SERVICING
RELAY RATING
2.5A 48VAC/VDC
COM 1
BATT-
UNUSED
BATT+
RLY NO
RLY NC
RLY COM
PARALLEL
COM 2
Note:
A 1/4 inch spacing must be
maintained between the battery
wires and the relay wires.
If this spacing cannot be
maintained use non-power
limited wiring methods as
described in NFPA 70
National Electrical Code.
The relay can only be used
with a listed power limited
resistive load, class 2 or
class 3 supply.
White: Relay Common
Yellow: Relay N.C.
Brown: Relay N.O.
Section 3 – Installation
3–9
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Troubleshooting
