Se nti
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Sentinel CXT Instruction Manual
Rev. 1.7
Page 33 of 49
Any BM25 channels that are found during Auto Configure will have “#xx” added to the end of the channel
tag, where “xx” is the Modbus address of the BM25. For example, if a BM25 with Modbus address 03 is
detected, all the channel tags for that BM25 will have “#03” at the end.
The Auto Configure process will also detect a BM25 as an alarm station. The BM25 will be listed in the
Alarm Station menu (Section 5.3.4) as “AS8x”, where ‘x’ is the hexadecimal value of the Modbus address
of the BM25 minus one. For example, if the BM25 has a Modbus address of 0Eh, then it will be listed as
“AS8D” in the Alarm Station menu.
When used with the CXT controller, the BM25 is responsible for activating its own alarms when it detects
gas. The CXT controller reads the alarm status from the BM25, and if it is in alarm, activates the strobe and
buzzer of any other BM25s in the network. It also activates any wired or wireless alarm stations in the
network. The alarm levels for a BM25 must be set using the BM25 menus. It is not possible to set these
levels using the CXT menus. The Set Channel Alarms menu (Section 5.4.3) reports the levels set on the
BM25, but does not allow the user to change them.
N O T E
The alarm levels for the BM25 channels cannot be set using the CXT Controller menus.
These levels must be set in the BM25.
5.6 W i
re le ssSe nsor C onfi
gura ti
on
The CXT Controller can be configured to communicate with up 32 CXT Wireless Sensors. All of the
sensors and the CXT Controller must be on the same RF channel. See Section 1.6 for information on
setting the RF channel of the CXT Controller. Refer to the CXT-DM and CXT-IR manuals for information
on setting their RF channels.
Each CXT sensor must have a unique Modbus address between 01h and 32h. Any CXT sensor that has a
Modbus address outside this range will not be properly recognized during Auto Configure.
N O T E
The CXT Wireless sensors must be addressed between 01h and 32h.
5.7 Four-Strobe A la rm B a r C onfi
gura ti
on
The Detcon Four-Strobe Alarm Bar is designed to supply a visual indication when the controller is in alarm
or fault. Alternatively, it can be used to indicate which of four attached wired sensors are in alarm. The
configuration of the channel alarms is different for each mode.
If the Four-Strobe Alarm Bar is used to indicate Alarm 1, Alarm 2, Alarm 3, and Fault, then all of the
channels should be assigned to Relay Bank 1. By default all channels are assigned to Bank 1, so typically
no additional configuration is needed. The user should set the alarm levels for each channel as appropriate
(see Section 5.4.3).
If the Four-Strobe Alarm Bar is used to signal which of the attached wired sensors are in alarm, then some
channels will need to be assigned to Bank 2. See the configuration in the following table:
Channel #
Alarm 1 Level
Alarm 2 Level
Alarm 3 Level
Alarm Bank
1
User Set
0
User Set
1
