Rockwell-automation 1747-PCIS API Software - Open Controller Instrukcja Użytkownika Pobierz pdf (Strona 106)

Publication 1747-UM002A-US-P - June 2000

6-46 Library of Routines

Example:

HANDLE Handle;

MSGBUF msgbuf;

int retcode;

retcode = OC_PollScanner( Handle, OCMSG_ANY, &msgbuf );

/* Check msgbuf.MsgID for what message is available */

OC_ReadHostRetentive

Data

OC_ReadHostRetentiveData reads the host-retentive-data partition of

the scanner.

Syntax:

int OC_ReadHostRetentiveData(HANDLE handle, BYTE

*buf, WORD offset, WORD len);

Parameters:

Description:

Data is not read past the end of the host-retentive-data partition.

It is recommended that you verify the integrity of the data stored in

the host-retentive-data partition. You can use the OC_CalculateCRC

function to generate a 16-bit CRC.

Parameter: Description:

handle Must be a valid handle returned from OC_OpenScanner

buf Contains the data that is read

offset The data is read

offset bytes from the beginning of the data

partition

If the number of bytes from

offset to the end of the partition is

smaller than len, no bytes will be read and ERR_OCPARAM is

returned.

len Defines how many bytes to read

IMPORTANT

On the 1747-PCIS only, the jumper for the

battery-backup dual-port memory is disabled by

default. You must switch the jumper to enable the

battery-backup feature.

The 1747-OCF dual port is NOT battery-backed.

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Rockwell-automation 1747-PCIS API Software - Open Controller Instrukcja Użytkownika Strona 106