Video_GetParam

[9801163]

Hi

I am looking for more details on the Video_GetParam function. The manuals don't seem to have a detailed description; all I can find is this. 

I am very new to programming so this may be obvious to everyone else.

idxDevice - Index of device connected. (Modbus address?)

idxParam - Index of parameter. (?)

subIdxParam - Sub-index of parameter. (?)

pVal - Address of variable that contains the read value. (?)

Output -  Number of chars printed (I dont think this is the value of the "get parameter") 

I really appreciate any help. 

[Bastian_Schmitz]

Hi, 

You could find this description in the online help of ESME HVAC

idxDevice is the id of the connected PLC. If you use TM172DGRP it is possible to connect more then one PLC. If you use the internal display the value is 0.

idxParameter is the modbus register adress from configuration tab

subIdxParam is 0 and not needed

pVal need to be attached via pointer (ADR) or (?) with the variabel you want to use in the HMI.

for type you need to use one of the follow shown types.

The easiest way to see an example is to check the integrated sample projects 

In the samples there are mostly constant values used for the modbus Register address. Every variable which is written in uppercase is a constant. 

And at least the best matching part of the forum for such question is the Pumping HVAC section. This is dedicated for ESME HVAC.

[9801163]

Thank you very much. I was getting confused over the word index, in this situation index is synonymous with address ....