IBCMD
Board-Level
Purpose
Send GPIB commands.
Format
C
|
unsigned long ibcmd (int ud, const void *cmdbuf, size_t count)
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Visual Basic
|
CALL ibcmd (ud%, cmdbuf$)
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or
|
status% = ilcmd (ud%, cmdbuf$, count&)
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Input
|
ud
|
A board unit descriptor |
|
cmdbuf
|
Buffer of command bytes to send |
|
count
|
Number of command bytes to send |
Output
| Function Return |
The value of Ibsta
|
Description
ibcmd sends count bytes from cmdbuf over the GPIB as command bytes (interface messages). The number of command bytes transferred is returned in the global function, Ibcnt. Refer to the list of IEEE 488 command messages for defined interface messages.
Command bytes are used to configure the state of the GPIB. They are not used to send instructions to GPIB devices. Use ibwrt to send device-specific instructions.
Possible Errors
|
EABO
|
The timeout period expired before all of the command bytes were sent. |
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ECIC
|
The interface is not Controller-In-Charge. |
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EDVR
|
The NI-488.2 driver is either configured incorrectly or is not properly installed. |
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EHDL
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ud is invalid or out of range. |
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ELCK
|
The requested operation could not be performed because of an existing lock by another process. |
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ENEB
|
The interface is not installed or is not properly configured. |
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ENOL
|
No Listeners are on the GPIB. |
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EOIP
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Asynchronous I/O is in progress. |