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hi, I knew the problem The problem was Visa laibrary is not installed Question How to Write the address? as a string? how?? i need just write at least one command Correctly Whoever command, reading and writing to gives command response thanks in the modbus manual Example 1 - Actual Data (3X References) To read actual parameters 2 and 3 (Current and Voltage, addressed as 1 and 2 hex) of the RVS-DN with a serial link number of 18, the host computer should send the following frame: byte 1: Serial Link No. ($18) byte 2: Function ($04) byte 3: Starting Address High ($00) byte 4: Starting Address Low ($01) byte 5: No. of Points High ($00) byte 6: No. of Points Low ($02) byte 7: CRC_Low ($XX) byte 8: CRC_High ($XX) The RVS-DN response, (when Current = 400 % of FLA, and Voltage = 420V) is: byte 1: Serial Link No. ($18) byte 2: Function ($04) byte 3: Byte Count ($04) byte 4: Data High, parameter 2 ($01) (400) byte 5: Data Low, parameter 2 ($90) byte 6: Data High, parameter 3 ($01) (420) byte 7: Data Low, parameter 3 ($A4) byte 8: CRC_Low ($XX) byte 9: CRC_High ($XX) Note: $XX indicates Hexadecimal byte. Do you write the address as a string, such as 180400010002 first calculat crc and write crc low& high in the string Is there a way to calculate the crc directly without the need for computed What are the functions necessary

have to communicate with the device via the opc server But I want to connect to the device by LabVIEW Error -1073807202 occurred at VISA Open in GPIB-VISA.vi

Hi I've downloaded the Mod bus Library available But when they run gives error Second I use RS485 link Name: IFD6500 from delta company I use LabVIEW version 2012 How to generate between LabVIEW and soft starter device By Mod Bus protocol using VISA laibrary and RS485 How do I read and write to all parameter Control and monitoring then served as the interface as I have said "GUI" Please attach a similar example of what I want

I need to help you to work project by LabVIEW Idea of the project Work on the external interface to control the Ketrical of Board of Water Pump Electrical board contains Soft starter a type: RVS-Dn 72 , solcon Frequency converter type: VFD 075E43A , delta I want to first: A connection to soft starter and frequency converter "inverter" via RS485 link use Mod Bus Protocol work GUI for soft starter: The main menu contain several keys to work Run ,START, soft START, stop , soft stop and Rest in the event of an Alarm and show the value of voltage and current. The second list contain parameter settings to read values and work setting "write" . The third spectrum describes plant for voltage and current. The same way we do for frequency converter but the main menu contain keypad to work high speed , low speed , run , stop Added menu enables to work sequence certain for work different movements Lab View contains a library of Mod Bus Protocol I do not know how to use it I have manual for mod bus soft starter and frequency converter DN_Modbus.pdf