viOpenDefaultRM
Syntax
viOpenDefaultRM(ViPSession sesn);
Description
This function returns a session to the Default Resource Manager resource. This function must be called before any VISA functions can be invoked. The first call to this function initializes the VISA system, including the Default Resource Manager resource, and also returns a session to that resource. Subsequent calls to this function return unique sessions to the same Default Resource Manager resource.
Note: All devices to be used must be connected and operational prior to the first VISA function call (viOpenDefaultRM). The system is configured only on the first viOpenDefaultRM per process. If viOpenDefaultRM is first called without devices connected and then called again when devices are connected, the devices will not be recognized. You must close ALL Resource Manager sessions and reopen with all devices connected and operational.
Parameters
|
Name |
Dir |
Type |
Description |
|
sesn |
OUT |
ViPSession |
Unique logical identifier to a Default Resource Manager session. |
Return Values
|
Type ViStatus |
This is the function return status. It returns either a completion code or an error code as follows. |
|
Completion Code |
Description |
|
VI_SUCCESS |
Session to the Default Resource Manager resource created successfully. |
|
Error Codes |
Description |
|
VI_ERROR_ALLOC |
Insufficient system resources to create a session to the Default Resource Manager resource. |
|
VI_ERROR_INV_SETUP |
Some implementation-specific configuration file is corrupt or does not exist. |
|
VI_ERROR_SYSTEM_ERROR |
The VISA system failed to initialize. |
See Also