eWriteAddresses [LJM User's Guide]

Write multiple device registers in one command, specified by address.

Syntax

LJM_ERROR_RETURN LJM_eWriteAddresses(
int Handle,
int NumFrames,
const int * aAddresses,
const int * aTypes,
const 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.

NumFrames [in]

The total number of frames to access. A frame consists of one value, so the number of frames is the size of the aAddresses array.

aAddresses [in]

An array of addresses that specify the Modbus register(s) to write. Addresses can be found throughout the device datasheet or in the Modbus Map.

aTypes [in]

An array containing the data type of each value:

aValues [in]

An array of values to send to the device. The array size should be the size of the aAddresses array. The input data type of each value is a double, and they will be converted into the data type entered in aTypes.

ErrorAddress [out]

If error, the address responsible for causing an error.

Returns

LJM errorcodes or 0 for no error.

Remarks

This function is used to write a handful of values at once, and is useful in programming languages that are not friendly towards the usage of strings. For programming languages that can use strings easily, see LJM_eWriteNames.

Example

Change digital I/O 0, 1, and 2 to output high, and digital I/O 6 to output low.

int LJMError;
int errorAddress;
int aAddresses[4] = {2000, 2001, 2002, 2006};
int aTypes[4] = {0, 0, 0, 0};
double aValues[4] = {1, 1, 1, 0};

// handle comes from LJM_Open()
LJMError = LJM_eWriteAddresses(handle, 4, aAddresses, aTypes, aValues, &errorAddress);
if (LJMError != LJME_NOERROR) {
    // Deal with error
}