CN0270 Software User Guide
Overview
CN-0270 is a complete 4-20mA Transmitter with HART system. It uses the AD5420, a 16-bit 4-20mA current source DAC, and AD5700/AD5700-1, a low power HART modem. The circuit can be configured with various process control current loop standards such as 4-20mA, 0-20mA and 0-24mA. This circuit adheres to the HART physical layer specifications as defined by the HART Communication Foundation, for example, the analog rate of change and noise during silence specifications.
The EVAL-CN0270-EB1Z evaluation board comes with an onboard ADI microcontroller that handles communication between the system and the evaluation software. It also complies with the double PMOD form factor for use with external processors.
This user guide will discuss how to use the evaluation software to configure and control the EVAL-CN0270-EB1Z Evaluation Board (CN-0270 Board)
Required Equipment
General Setup
The board is supplied via terminal block P1, +24VDC is recommended.
The current loop output is derived from terminal block P3.
The
USB-SWD/UART-EMUZ connects to the
J-Link header for control using the evaluation software
Link P2
Link PMOD
Link XTAL
Installing the Software
Extract the file
CN0270 Eval Software.zip and open the file
setup.exe.
NOTE: It is recommended that you install the CN0270 Evaluation Software to the default directory path C:/Program Files/Analog Devices/CN0270/ and all National Instruments products to C:/Program Files/National Instruments/
Click
Next to view the installation review page
Click Next to start the installation
Upon completion of the installation of the CN0270 Evaluation Software, the installer for the ADuCM360 and Segger J-Link Drivers will execute.
NOTE: It is recommended that you close all other applications before clicking “Next”. This will make it possible to update relevant system files without having to reboot your computer.
Click I Agree to accept the software license agreement and initiate the installation
Select only
ADuCM360 and
Segger J-Link Software on the options shown
NOTE:Only these two options are required and included with the installer. To download the full ADuCM360 software bundle, please see the Additional Info section of this wiki.
Using the Evaluation Software
Software Controls and Indicator Descriptions
Main Window
This Window contains the block diagram of the system and gives access to the different controls and indicators.
Output Current
DAC Code
Test Current
Open AD5420 Configuration window
Open HART Modem window
Hart Activity Indicator
Reset
Status Bar
AD5420 Configuration Window
This window allows for configuration of current output section of the circuit. This window must be closed to resume operation of the software.
Output Enabled
Output Range
Digital Slew Rate Control
Enable Button - Enables/Disables the Digital Slew Rate Control
Step Size – defines by how much the output value changes at each update.
Update Rate – defines the rate at which the digital slew is updated.
Configure
Cancel
HART Modem Window
This window holds the controls and displays for transmitting and reading data from the HART interface. This window can run in parallel to the main window.
Receive Buffer – Displays the received HART Data
HART Page – This shows the HART data divided into the corresponding packets
Raw – This shows the all HART data bytes received during the last transmission
Transmit Buffer – Transmit data that is defined by the user.
HART Page – this page allows the user to configure the HART packet to be transmitted. The software will automatically format the HART packet from the values entered.
Copy Data from Rx Buffer – Copies data from the receive buffer to the transmit buffer
Transmit Data – Transmits HART data based the values entered
Raw – This page allows the user to define the data to be sent without formatting
Additional Info
Microcontroller References
Schematic, PCB Layout, Bill of Materials