Detcon CXT-N7 - Manual (Page 8)

Model X40
Model X40 Instruction Manual Rev. 0.0 Page 2 of 23
1.2 System Operation
The heart of the CXT controller is the non-intrusive magnetic interface with backlit LCD display. The
controller communicates with sensors and alarm stations using RS-485 Modbus™ RTU protocol
distributed over a wireless network. The CXT controller includes a wireless transceiver that communicates
directly with Detcon’s CXT sensors and Detcon Wireless Alarm Stations using the RXT-320 Transceivers.
Figure 3 CXT Controller PCA
Alarm values and fault conditions can be field-configurable via the magnetic user interface to cause an
assigned relay output or bank of relay outputs to fire, thus triggering external alarm devices. As gas alarm
or fault conditions clear, the assigned relay or bank of relay outputs will return to their normal states.
NOTE: All relays controlled by the CXT must be remotely mounted with their own
transceiver. These relays are typically part of the wireless alarm stations, but can be RL-4
modules connected to an RXT-320 transceiver.
The CXT controller can be configured for various CXT sensors and wireless alarm stations at the Detcon
factory based on application specific information provided by the customer on the Configuration Form. It
must be verified that the correct quantity and type of sensors have been purchased to support the customer’s
configuration requirements. On the Configuration Form, the customer should supply all site-specific
information:
1) Number of gas channels
2) Detcon sensor model number for each channel
3) Range, units, and gas type for each channel
4) Alarm level(s) for each gas channel
5) Device Tag for each channel
6) Assignment and set-up information for each alarm station or RL-4 module
NOTE: The set-up configuration is fully field-configurable and can be executed by the user in
the field. Refer to section 4 System Operation and Configuration. Modifications to the set-up
configuration are expected to take place at the customer’s site due to requirement changes
and/or system expansions.