RXT-300 SmartWireless™
RXT-300 Wireless IM
Rev. 2.0
Page 24 of 41
RXT
This is the specific RXT-300 that the sensor is attached to and will be presented to the user in the WCT as a
pull down list of RXT Names that were entered when adding RXT-300s earlier.
Modbus™ Parameters
This defines how the sensor will be accessed through Modbus™. All devices in a Modbus™ based system
must have unique Modbus™ addresses which are addresses 1-247. In a RXT-300 system up to 32 sensors can
be added and will have addresses 1-32 and up to 32 RXT-300s can be added and these will be address
161-192. When using Detcon 100 series sensors, these are all fixed to address 1 and the RXT-300 will
translate this to a unique system-wide Modbus™ address when the sensor is added. For the rest of the sensors
the RXT-300 configuration and the sensor Modbus™ address must be set to the same value for proper
operation.
The rest of the Modbus™ settings define the registers to be accessed during a read as well as indentifying the
reading register that provides the concentration. The reading register is the one display on the HMI Station
and is used to process Alarms based upon the thresholds set. If a Detcon sensor type is selected in the list of
device types, these parameters will be filled in automatically. If “Other” is selected these will need to be set
manually and include the starting register address, the number of registers and the reading register.
Alarm Parameters
The range and alarm threshold settings are used to facilitate alarm threshold processing. This allows the user
to generate up to three Alarms based upon threshold, ascending or descending. These three alarms can then be
mapped to any of the Alarm Outputs 1-4. Range is set to the range of the device output and is used to scale
4-20mA values during alarm threshold processing and to determine over / under range for known Detcon
types. Most of these settings will default to common values but should be reviewed by the customer.
4.3
System Parameters Detailed
This section covers in detail settings that affect operation of the RXT-300s system wide. There are two other
major groups of settings covered later, one when adding RXT-300s and one when adding sensors. All these
settings are entered using the RXT-300 Wireless Configuration Tool (WCT) and are presented below in the
general order that they will be entered. For specific WCT menus and selection process refer to the RXT-300
Wireless Configuration Tool manual itself. Many of the configuration parameters relate directly to the
operational features already discussed so they should be easier to understand.
As part of the configuration data, the user can assigns names to RXT-300s, Sensors, Alarm Zones and even the
wireless network itself. This is purely to help the user in identifying each of these more easily in a system and
does not make any difference in system operation. It can help later when editing an existing configuration or
differentiating between multiple systems that may be fielded. Also if the HMI Panel is used the first several
characters of the RXT-300 and Sensor Names are actually displayed along with their respective data.
4.3.1
Network Parameters
These parameters set up the RF Channel and Network ID for all radios in the system. Network Sleep is also
set up here.
System Name
Alphanumeric name for the Wireless Network – no operational significance
RF Channel
Sets all RXT-300 radios in system to an RF channel (Values: 0-15)
Network ID
Sets all RXT-300 radios in system to Network ID (Values: 0-65535). Networks with
different network IDs can occupy the same RF channel.
