DAT3024 - Application Note - Using DAT3000Modbus software to setup DAT3000 series devices

Sep 17, 2026

Application note describing how to set up DAT3000 series devices using DAT3000Modbus software. Covers RS-485 and RS-232 wiring, initial communication opening with correct COM port and baud rate, and configuration steps such as reading current parameters and updating address and baud rate. Includes device testing after removing INIT, reading and changing analog outputs, and sending Modbus commands to write registers, including register zero-based mapping and example register value conversion using hex and high/low parts.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages4

Reading Time10 min

AccessFree to download

Step 1 – Connect device

RS-485 connection

RS-232 connection

Step 2 – Open the connection

Step 3 – Read and change the device configuration

Step 4 – Test the device

Step 5 – Read and change the device Output

Step 6 – Sending modbus commands to read/write registers

| | APPLICATION NOTE
DAT3024 | | --- | --- | Using DAT3000Modbus software to setup DAT3000 series devices STEP 1 – Connect device RS-485 devices: Connect the PC to serial converter (DAT3580 or similar) and devices to setup as following: | PC | | DAT 3580 | D A | | DAT 3024 | | --- | --- | --- | --- | --- | --- | | | | |
E B
| | | | | | |
INIT | C | | | | RS-232
USB
or
ETHERNET | | | | | | | | | | D | | RS-232 devices: Connect the PC to the devices to setup as following: | PC
(RS-232 DB9) | 5 | C | | DAT 3024 | | --- | --- | --- | --- | --- | | | | INIT | D | | | | 3
| | E | | | |
2 F | | | | | | | | | | Please refer to the technical documentation of the device in use for the right connection. STEP 2 – Open the connection In DAT3000Modbus software, the Communication window is always visible. → If address or baud rate of the device is unknown, keep connected the INIT terminal (D) to the GND terminal (C) and reset the device (power off and power on) . Until the terminals still connected, the device will communicate as address 1, 9600 bps and RTU mode. → Open DAT3000Modbus software. → In the Communication window (always visible) select the proper COMport and the baud rate of the device (if INIT connected, select 9600bpsand 8, n, RTU mode) . → Click on “Open COM”. If the red led will turn on, the COM port will be successfully opened. If not, check for availability of the COM port and if it is free (not used by other software) . STEP 3 – Read and change the device configuration → Open the device configuration form. Search in the“Program” menu for the proper device and click. The proper configuration form will be shown. → Set in the Address field at the top left the address of the device (if INIT connected, set 1) . → Click on “Read”. All fields will show the actual setting. Click the “Start” button to update continuously the parameters. Click “Stop” to terminate the update. → To change a parameter, set the proper field and click on the relative “ --> ” button. Example: configure the device to Address 2, 38400bps → Set the field “Address” to 2 then click on the relative“-->”button. → Set the field “Baud-Rate” to 38400 then click on the relative “-->” button. → Click on “Read” to check for the successful change of parameters. STEP 4 – Test the device → Remove the INIT connection and reset the device (power off and power on) . → In the Communication window, click on “Close COM”. The red led will turn off. → Set the baud rate to 38400, then click on “Open COM”. The red led will turn on. → In the device form, set in the Address field at the top left the address of the device (2) . → Click on “Read”. All fields will show the actual setting. Click the “Start” button to update continuously the parameters. Click “Stop” to terminate the update. If no errors occours, the device is successfully configured. STEP 5 – Read and change the device Output Set and generate analog output (where available): → In the device form, select the desired output type mA in the “Type” list, then click on the relative “-->” button. → To set the desired analog output value, write in the“Output” field the value expressed in mA. In the picture, the example shows how to configure the following: OUT 0 = 5 mA OUT 1 = 20 mA OUT 2 = 10 mA OUT 3 = 7 mA STEP 6 – Sending modbus commands to read/write registers → To write a register ([i.e. an](i.e. an) analog output register) Set the following: ADD Address of the device FUN 6 (write register function) ST H 0 ST L Register to write Note: register are zero-based, so to write the register 40001 the field ST L must be set as 0 register 40002 the field ST L must be set as 1 And so on... (in the example, write register 40015) N° H High-part of the register value N° L Low-part of the register value Note: to calculate these values, follow this procedure: Value

FAQs

How should INIT and GND be connected when the device address or baud rate is unknown?

Keep the INIT terminal (D) connected to the GND terminal (C), then reset the device. The device will communicate as address 1, 9600 bps, RTU mode while the terminals remain connected.

How do you open communication in DAT3000Modbus?

In the Communication window, select the proper COM port and baud rate. If INIT is connected, select 9600 bps and 8, n, RTU mode, then click “Open COM” and verify the red LED turns on.

How are analog output values written through Modbus registers?

Analog outputs are mapped to registers Out0: 40015, Out1: 40016, Out2: 40017, Out3: 40018. Values must be expressed in uA (e.g., 10 mA written as 10000), and writing uses Modbus function FUN 6 with zero-based register indexing for the ST L field.

Sep 17, 2026

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