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Chapter 5
tmo - Change or Disable Time Limit
Type: Initialization function
Syntax: tmo [timeio][,timesp]<CR>
Purpose: You use tmo at the beginning of your program to change the
time limits in effect on the GPIB-232CT. The time limits
prevent the GPIB-232CT from hanging indefinitely when
waiting for critical events to occur.
Remarks: The arguments timeio and timesp are numeric strings.
timeio specifies the amount of time in seconds the
GPIB-232CT waits for an I/O operation (rd, wrt, cmd) or
the wait function to complete. timesp specifies the
amount of time in seconds each device is given in which to
respond to a serial poll. The power-on timeouts are 10
seconds for timeio and 1/10 of a second for timesp.
timeio and timesp can be any decimal number between
.00001 and 3600, which corresponds to time limits between
10 microseconds and 1 hour. 10,.1 specifies a time of 10
seconds for I/O operations and 1/10 of a second for serial poll
response. timeio and timesp can also be 0, which
disables either timeout accordingly. Neither timeio nor
timesp can contain commas.
The timeio time limit is in effect for the cmd, rd, and wrt
functions. If the GPIB-232CT cannot complete any of these
functions within the period of time set by timeio, it aborts
the function and records the EABO error. Bytes that were
transferred before the timeout are not affected.
The timeio time limit is also the maximum amount of time
the wait function waits when you call it with the TIMO bit set
in the wait mask.
The timesp time limit is in effect only for the rsp function.
If a polled device fails to respond within the amount of time
indicated by timesp, the GPIB-232CT returns an error flag.
© National Instruments Corp.
5-53
GPIB-232CT User Manual
S Mode Functions
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