« Close

Datasheets and User Guides

App Notes

Software & Driver

 

2.3.9 - eReadNameArray

Read consecutive values, specified by a name.

Syntax

LJM_ERROR_RETURN LJM_eReadNameArray(
                      int Handle,
                      const char * Name,
                      int NumValues,
                      double * aValues,
                      int * ErrorAddress)

Parameters

Handle [in]
A device handle. The handle is a connection ID for an active device. Generate a handle with LJM_Open or LJM_OpenS.
Name [in]
The name that specifies the Modbus register(s) to read.  Names can be found throughout the device datasheet or in the Modbus Map.
NumValues [in]
The number of consecutive values to read.
aValues [out]
An array of values to be transferred from the device. The array size should be equal to NumValues. Each value will be converted according to the type of Name.
ErrorAddress [out]
If error, the address responsible for causing an error.

Returns

LJM errorcodes or 0 for no error.

Remarks

The Address version of this function is LJM_eReadAddressArray.

If NumValues is large enough, these functions will automatically split reads into multiple packets based on the current device's effective data packet size. Using both non-buffer and buffer registers in one function call is not supported.

Examples

[C/C++] Read analog inputs 0 through 7

int LJMError;
int errorAddress;
double newValues[8];

// handle comes from LJM_Open()
LJMError = LJM_eReadNameArray(handle, "AIN0", 8, newValues, &errorAddress);
if (LJMError != LJME_NOERROR) {
    // Deal with error
}