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ControlLogix Platform ♦ "C" Programmable CIP API Functions
Linux Application Development Module Developer's Manual
ProSoft Technology, Inc. Page 101 of 264
March 12, 2014
OCXcip_ReadConnected
Syntax
int OCXcip_ReadConnected(OCXHANDLE apihandle,
OCXHANDLE connHandle,
BYTE *dataBuf,
WORD offset,
WORD dataSize );
Parameters
apihandle
handle returned by previous call to OCXcip_Open
connHandle
handle of open connection
dataBuf
pointer to buffer to receive data
offset
offset of byte to begin reading
dataSize
number of bytes to read
Description
This function is used by an application to read data being received on the open
connection specified by connHandle.
apiHandle must be a valid handle returned from OCXcip_Open. connHandle must be
a handle passed by the connect_proc callback function. offset is the offset into
the connected data buffer to begin reading. dataBuf is a pointer to a buffer to
receive the data. dataSize is the number of bytes of data to be read.
Notes: When a connection has been established with a ControlLogix controller, the first 4 bytes of
received data are processor status and are automatically set by the controller. The first byte of data
appears at offset 4 in the receive data buffer.
Return Value
OCX_SUCCESS
data was read successfully
OCX_ERR_NOACCESS
apihandle does not have access
OCX_ERR_BADPARAM
connHandle or offset/dataSize is invalid
Example
OCXHANDLE apihandle;
OCXHANDLE connHandle;
BYTE buffer[128];
// Read 128 bytes from the connected data buffer
OCXcip_ReadConnected(handle, connHandle, buffer, 0, 128 );
See Also
OCXcip_WriteConnected
- MVI56E-LDM 1
- Your Feedback Please 2
- Warnings - MVI56E-LDM 2
- Contents 5
- 1 LDM Introduction 10
- In This Chapter 12
- 2.1 System Requirements 12
- 2.2 Package Contents - LDM 13
- 2.4.1 Setup Jumper - MVI56E 14
- telnetd file 20
- 2.8 Module Rescue 27
- 3 Development Environment 29
- 3.2 Using Eclipse 33
- 3.2.1 Building a Project 33
- python createimage.py 36
- 4.1 API Library - MVI56E 39
- 4.1.1 Header File 39
- 4.1.2 Sample Code 39
- 4.3 CIP API Functions 42
- 4.4 Backplane Device Driver 42
- 4.5 Sample Code 44
- 4.10 Sample Tutorials 51
- 4.11 Ethernet Sample 52
- 4.12 Serial Sample 55
- 4.13 Led_Sample 56
- 4.14 Backplane_Sample 57
- 4.15 Tag_Sample 59
- 4.16 Sample Applications 61
- 5 CIP API Functions 76
- OCXcip_Open 79
- OCXcip_OpenNB 80
- OCXcip_Close 83
- 5.2 Object Registration 85
- OCXcip_RegisterAssemblyObj 85
- OCXcip_UnregisterAssemblyObj 88
- OCXcip_RegisterFatalFaultRtn 90
- OCXcip_RegisterResetReqRtn 92
- 5.4 CIP Callback Functions 94
- 5.5 Connected Data Transfer 105
- OCXcip_WriteConnected 105
- OCXcip_ReadConnected 107
- OCXcip_ImmediateOutput 109
- OCXcip_WaitForRxData 111
- 5.6 Tag Access Functions 116
- OCXcip_AccessTagData 116
- OCXcip_CreateTagDbHandle 120
- OCXcip_DeleteTagDbHandle 121
- OCXcip_SetTagDbOptions 122
- OCXcip_BuildTagDb 125
- OCXcip_TestTagDbVer 127
- OCXcip_GetSymbolInfo 129
- OCXcip_GetStructInfo 132
- OCXcip_GetStructMbrInfo 135
- OCXcip_GetTagDbTagInfo 138
- OCXcip_AccessTagDataDb 141
- 5.7 Messaging 144
- OCXcip_GetDeviceIdObject 145
- OCXcip_GetDeviceICPObject 148
- OCXcip_GetDeviceIdStatus 151
- OCXcip_GetExDeviceObject 155
- OCXcip_GetWCTime 158
- OCXcip_SetWCTime 162
- OCXcip_GetWCTimeUTC 165
- OCXcip_SetWCTimeUTC 169
- 5.8 Miscellaneous Functions 172
- OCXcip_GetIdObject 173
- OCXcip_SetIdObject 175
- OCXcip_GetActiveNodeTable 177
- OCXcip_MsgResponse 179
- OCXcip_GetVersionInfo 182
- OCXcip_GetUserLED 184
- OCXcip_SetUserLED 186
- OCXcip_GetModuleStatus 188
- OCXcip_SetModuleStatus 190
- OCXcip_GetLED3 192
- OCXcip_SetLED3 194
- OCXcip_ErrorString 196
- OCXcip_SetDisplay 198
- OCXcip_GetDisplay 200
- OCXcip_GetSwitchPosition 202
- OCXcip_GetSerialConfig 204
- OCXcip_Sleep 207
- OCXcip_CalculateCRC 209
- OCXcip_SetModuleStatusWord 211
- OCXcip_GetModuleStatusWord 213
- 6 Cable Connections 215
- 6.3 RS-422 218
- 6.4.1 RS-485 and RS-422 Tip 219
- 7.2.1 Returning Any Product 221
- 7.3 LIMITED WARRANTY 223
- 7.3.8 No Other Warranties 229
- 7.3.9 Allocation of Risks 229
- 7.4 Open Source Licensing 230
- 7.5 GNU Public License 231
- 7.6 Eclipse Public License 245
- 7.7 Python Public License 251
- 7.8 GCC Public License 257
- 8 Glossary of Terms 260
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