Detcon X40-32-N7 - Manual (Page 41)

Model X40
Model X40 Instruction Manual Rev. 3.3 Page 35 of 64
NOTE
The only Modbus™ capable Detcon sensors that may be used with the X40 are Model 100,
Model 600 and Model 700 series.
R
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8 5
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Figure 34 Modbus™ Gas Sensor Connections
NOTE
Each sensor and DIN rail module must have a unique Modbus™ address. No two devices
on the Modbus™ network can have the same address.
Ensure that each serial sensor is assigned a unique Modbus™ address and within the range
01h-7Fh. Connect the sensors in a daisy-chained series to the other RS-485 sensors.
NOTE
A serial sensor connected properly to the controller will provide the controller with a
continuous reading of the sensor attached. Serial sensors must be connected in series to the
RS-485 Master port and must be addressed correctly.
3.7 Wireless RXT-320 Modbus™ Devices and CXT-320 Sensors
Detcon offers a wide range of wireless sensors and field devices for use with the X40 wireless option if
selected. Devices such as alarm stations, remote displays and various sensor types are available and able to
communicate wirelessly using transceivers that operate at 2.4GHz and conform to non-licensed radio
frequency appliance usage around the world. Refer to these devices specific manuals for more detailed
information.
For proper communication, wireless devices must have a unique Modbus™ address and must reside on the
same RF channel/Network ID as the wireless transceiver of the X40 Master Ports Transceiver.
The
assigned Modbus address for the serial sensor does not necessarily correspond to the channel number in the
controller. The Modbus address assigned for wireless sensors does not necessarily determine the channel
number the controller will assign it to. (Modbus™ addresses are hexadecimal. Channels numbers are
decimal.
A conversion chart can be found in Section 11.2 Hexadecimal Table.) The controller will
acknowledge Wireless sensors addressed between 01h and 7Fh. The controller will acknowledge alarm
stations with addresses of 80 through 8Fh.
NOTE: Each wireless device in the network must have a unique Modbus address. All
wireless devices in the network must reside on the same RF channel/Network ID.
3.8 RXT-320 Wireless transceiver Analog Inputs
The RXT-320 wireless transceiver provides two 4-20mA inputs that can be used to monitor 4-20mA
devices. The input values are continuously read and stored in two separate registers accessible through