Detcon CXT-N7 - Manual (Page 19)

Model X40
Model X40 Instruction Manual Rev. 0.0 Page 13 of 23
These values can be changed by swiping the magnet over the markers of the up or down arrows to move
the arrow prompt “→” to the desired function. A swipe over the ENTER marker will select the function
indicated by the arrow prompt “→” and the value can be changed by swiping over the markers of the up or
down arrows. Another swipe over the ENTER marker will save the selected value.
Response timeout is the amount of time in milliseconds the CXT controller will wait for a sensor to
respond to a poll request. Ten missed poll responses will result in the sensor being declared in COMM
ERR. Inter-poll delay is the amount of time in milliseconds the CXT will wait after receiving a poll
response from one sensor before it polls the next sensor. The range of values for the response timeout is
100-1000 milliseconds and 10-255 milliseconds for the inter-poll delay. The recommended value for the
response timeout is 500 and 150 for the inter-poll delay.
4.3.7 Set Channel Data
The SETUP CHANNEL DATA menu allows configuration of each channel represented by its assigned
sensor. When a sensor is being added to the controller, its information will need to be added or modified in
this menu.
The information to be configured is the SLAVE ID, DEVICE TYPE, ANALOG INPUT,
DECIMAL POINT, RANGE, TYPE and RL4 BANK. Upon entering this menu, the LCD will display:
CHANNEL 1 DATA: DECIMAL POINT:#
SLAVE ID:## RANGE:#####
DEVICE TYPE:XXX TYPE:XXXXXXXXX
ANALOG INPUT:# RL4 BANK:XXX
A flashing cursor will appear on SLAVE ID. Swiping the magnet over the markers of the up or down
arrows will move the flashing cursor to the desired function. A swipe over the ENTER marker will select
the function indicated by the flashing cursor and the value can be changed by swiping over the markers of
the up or down arrows. Another swipe over the ENTER marker will save the selected value and return to
the flashing cursor.
The SLAVE ID is the Modbus™ address in hex of the sensor being assigned to that channel. This will be a
Modbus™ slave device to the CXT controller.
NOTE: For Detcon CXT sensors, the SLAVE ID is the Modbus™ address of its transceiver as
well as the address of the sensor.
The DEVICE TYPE values available are 100, 600, 700, CXT Sensor, DA4/DI4 or RXT-320. The values
of 100, 600 and 700 correspond to Detcon serial sensor models. The DA4/DI4 value represents analog
sensors. The RXT-320 value represents Detcon’s wireless transceiver when its analog inputs are used.
CXT refers to the sensor type that is utilized with the CXT controller. Choose the appropriate value
corresponding the sensor or device being assigned to the indicated channel.
The DECIMAL POINT value can be 0, 1 or 2. It corresponds to the number of digits displayed to the right
of the decimal point of the gas concentration value displayed. Typically, if the sensor range is less than 10,
this value will be ‘2’. If the sensor range is between 10 and 25, then this value will usually be ‘1’. The
DECIMAL POINT value should be ‘0’ if the sensor range is greater than 25.
The RANGE value can be selected from 1-10,000 and corresponds to the gas range value of the sensor.
NOTE: If the range is changed, the alarm levels will have to be reset!
The TYPE value is an alphanumeric string of nine characters and corresponds to the tag that is displayed
with the gas concentration value. This field is normally used to define the gas concentration units and the
gas type. When changing this value, the first alphanumeric character to be modified will be indicated by an