Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 326)

III. COMMAND REFERENCES - 15. Command References 15A. Driver488/DRV Commands
Personal488 User’s Manual, Rev. 3.0 III-311
During OUTPUT , Driver488 takes the EOL terminator it receives from the user’s program, and replaces
it with the bus output terminator before sending it to the I/O adapter device. Conversely, when
Driver488 receives the bus input terminator, it replaces it with the
EOL input terminator before
returning it to the user’s program. The default terminators for both input and output are normally
CR LF EOI , which is appropriate for most bus devices.
EOI has a different meaning when specified for input than when it is specified for output. During input,
EOI specifies that input is terminated on detection of the EOI bus signal, regardless of which characters
have been received. During output, EOI specifies that the EOI bus signal is to be asserted during the
last byte transferred.
TIME OUT
SYNTAX TIME OUT [devicename] n[.[n][n][n]]
devicename is the name of the external device.
n[.[n][n][n]] , the time out value, is the number of seconds to allow in the
range of 0.000 to 65535.999 . If zero is specified, ignore time outs. A
leading 0 must be used for time out intervals below 1.000 second.
RESPONSE None
MODE Any
BUS STATES None
SEE ALSO RESET, MAKE DEVICE
EXAMPLES PRINT#1,"TIME OUT10" Reset to default (10 seconds).
PRINT#1,"TIME OUT0.5" Set time out interval to one-half second.
PRINT#1,"TIME OUT3600" Wait an hour before a time out error.
PRINT#1,"TIME OUT0" Ignore time outs.
The TIME OUT command sets the number of seconds that Driver488 waits for a transfer before
declaring a time out error. Driver488 checks for time out errors on every byte it transfers, except in the
case of
CONTINUE transfers. While the first byte of a CONTINUE transfer is checked for time out errors,
subsequent bytes are not. The user’s program must check for timely completion of a CONTINUE
transfer.
Time out checking may be suppressed by specifying time out after zero seconds. The default time out
is
10 seconds. The time out interval may be specified to the nearest 0.001 seconds. However, due to
the limitations of the computer, the actual interval is always a multiple of 0.055 seconds (55
milliseconds) and there is an uncertainty of 0.055 seconds in the actual time out interval. Time out
intervals from 0.010 to 0.110 seconds are rounded to 0.110 seconds. Larger intervals are rounded
to the nearest multiple of 0.055 seconds (e.g., 0.165 , 0.220 , 0.275 seconds, etc.).
TRIGGER
SYNTAX TRIGGER [addr[,addr...]]
addr is a device address (primary with optional secondary) or an external device
name to be triggered.
RESPONSE None
MODE CA
BUS STATES ATN
•GET (without addr)
ATN
•UNL, MTA, LAG, GET (with addr)
SEE ALSO STATUS, SEND, TriggerList (Sub-Chapter 15B)
EXAMPLES PRINT#1,"TRIGGER" Trigger all current listeners.
PRINT#1,"TRIGGER02,04,16" Issue Group Execute Trigger (GET) to
devices 2, 4, and 16.