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I had to open the COM port first using the SysCom library - this returns the RTS_IEC_HANDLE for the port to pass into the ModbusRequest block.
There is very, very little documentation on this...
VAR  modbusRequestSerial:IoDrvModbus.ModbusRequest2;  modbusCommandSerial:IoDrvModbus.ModbusCommand;  comm:IoDrvModbus.RTS_IEC_HANDLE;  commSettings:SysCom.COM_Settings;  pntResult:POINTERTOSysCom.RTS_IEC_RESULT;END_VAR            comm:=SysCom.SysComOpen2(pSettings:=ADR(commSettings),0,pResult:=pntResult);            modbusRequestSerial(              xExecute:=xExecute,              xAbort:=,              hComPort:=comm,              usiSlaveAddr:=32,              modbusCommand:=modbusCommandSerial,              tResponseTimeout:=,              uiSendTimeout:=,              pSendData:=ADR(servoOpcode),              pRecvData:=,              transmission:=,              xDone=>xDone,              xBusy=>,              xError=>xError,              xAborted=>,              uiDataLength=>,              byModbusError=>);
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Anonymous
-
2018-03-20
Originally created by: ph0010421
thank you
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Originally created by: ph0010421
I'd like to use the ModbusRequest FB. One of the inputs is the RTS_IEC_HANDLE.
Which function/method will return this handle for me?
thanks
I had to open the COM port first using the SysCom library - this returns the RTS_IEC_HANDLE for the port to pass into the ModbusRequest block.
There is very, very little documentation on this...
Originally created by: ph0010421
thank you