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DasyLab Platinum Modbus Interface
DasyLab supports Modbus RTU (serial) and Modbus TCP/IP (Ethernet). The Platinum controller
supports Modbus RTU on the USB interface, the RS232/RS485 interface (if installed) and Modbus
TCP/IP on the Ethernet interface (if installed). For the serial channel and USB connections the correct
COM channel must be selected and for serial channels the appropriate INTERFACE parameters
must be chosen. The Platinum unit must have its corresponding COM parameters set accordingly.
If using serial interface, DASYLab assumes the function of the master which sends commands to the
measurement devices or slaves. If using TCP/IP interface, DASYLab assumes the function of the
client which requests data from the server.
3.3 Example
3.3.1 Serial interface
In the example shown, the Platinum controller has been connected using a USB cable and appears
as 'Virtual COM Port' 256 within the Windows environment. For USB connections the serial interface
parameters are ignored. The Platinum /INIT/COMM/USB/PROT (front panel access menu) has been
set to MODBUS/RTU.
The Register Starts at 0 option should be checked. The '30' Pull Down option may be ignored. All
values are accessed using BIG ENDIAN format and the 'swap word order' option should remain
unchecked.
When a Modbus Input/Output module is placed it is necessary to link the associated values with the
correct Platinum Modbus registers. DasyLab requires that register values are entered as decimal
values.
The following example shows how Modbus Analog Input module can be configured.
On Analog Input Channel 0, the channel is named as Process Value with Celsius temperature unit.
The register index is 528 (Register starts at 0) and the Register data type is Float (32 bit). The Device
Address is 0x01.
On Analog Input Channel 1 and 2 (not shown), Peak Value and Valley Value are configured with the
matching Register index and Data type that can be found in Platinum Series User Manual -
Modbus Interface document.
Document Number
For Internal Use Only: This document contains confidential, proprietary information of Omega Engineering/Newport Electronics,
The Document may not be copied or reproduced without the prior, written permission of Omega Engineering/Newport Electronics
Revision 1.0
Page 9 of 11
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