eReadAddress [LJM User's Guide]

Read one value, specified by address.

Syntax

LJM_ERROR_RETURN LJM_eReadAddress(

int Handle,

int Address,

int Type,

double * Value)

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.

Address [in]

The address that specifies the Modbus register(s) to write. Addresses can be found throughout the device datasheet or in the Modbus Map.

Type [in]

The data type of the value:

Type	Integer Value
LJM_UINT16	0
LJM_UINT32	1
LJM_INT32	2
LJM_FLOAT32	3

Value [out]

The value returned from the device. The output data type is a double, and will be converted according to the Type input.

Returns

LJM errorcodes or 0 for no error.

Remarks

For an alternate function using a name rather than address, see LJM_eReadName. More code examples coming soon.

Example

Read the serial number of the device.

C

int LJMError;
double newValue;
// handle comes from LJM_Open()
LJMError = LJM_eReadAddress(handle, 60028, 1, &newValue);
if (LJMError != LJME_NOERROR) {
    // Deal with error
}
printf("SERIAL_NUMBER: %f\n", newValue);