Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 315)

15A. Driver488/DRV Commands III. COMMAND REFERENCES - 15. Command References
III-300 Personal488 User’s Manual, Rev. 3.0
OUTPUT #count BUFFER (Controller Mode)
SYNTAX OUTPUT [addr]#count BUFFER buf-addr [CONTINUE] [term] [term]
[EOI]
addr is a device address (primary with optional secondary) or an external device
name.
count is the number of bytes to OUTPUT .
buf-addr is the memory buffer address.
CONTINUE specifies asynchronous transmission.
term and EOI override the normal IEEE 488 bus output terminator
RESPONSE None
MODE CA
BUS STATES REN (if SC), *ATN, data (without addr)
REN (if SC), ATN
•MTA, UNL, LAG, *ATN, data (with addr)
SEE ALSO ENTER, TERM, TIME OUT, EOL, BUFFERED
EXAMPLES PRINT#1,"OUTPUT16#100 BUFFER
&H2000:0”
Send 100 characters from memory at &H20000.
PRINT#1,"OUTPUT16#100 BUFFER
&H20100 EOI”
Send 100 characters from memory at &H20100
asserting EOI with the last character.
PRINT#1,"OUTPUT0701 #100
BUFFER &H1000:0 EOI”
Send 100 characters to bus device 07.
PRINT#1,"OUTPUT16#100 BUFFER
&H2000:0 CONTINUE EOI”
Send 100 characters and allow the program to
continue while the transfer is taking place.
PRINT#1,"WAIT" Wait for the transfer to complete.
PRINT#1,"OUTPUT16#100 BUFFER
&H2000:100”
And send the next 100 bytes.
The OUTPUT #count BUFFER command sends data to I/O adapter devices from a user- supplied
memory region. The Remote Enable ( REN ) line is first asserted if Driver488 is the System Controller.
Then, if a device address (with optional secondary address) is specified, Driver488 is addressed to Talk
and that device is addressed to Listen. If no address is specified, Driver488 must already be configured
to send data, either as a result of an immediately preceding
OUTPUT command, or as the result of a
SEND command.
The character count count must be specified and is the number of characters that is transferred.
OUTPUT #count BUFFER does not send any bus output terminators unless they are specified. The
number of characters actually sent can be checked with the BUFFERED command.
If CONTINUE is specified, then Driver488 returns control to the user’s program as soon as possible
without waiting for the transfer to be completed. It does, however, wait for the first byte to check for
time-out unless a time-out value of
0 had been specified by a TIME OUT command. Because of
hardware limitations, the CONTINUE may not return until a substantial portion of the transfer is
complete.
CONTINUE transfers are not finished until Driver488 has had an opportunity to “clean up” and complete
the transfer. This “clean up” is usually automatic: Driver488 implicitly performs a WAIT command
before performing any bus command. The program can itself use the WAIT command to guarantee that
the transfer is complete.
All characters in the memory buffer are sent exactly as stored. No detection of the EOL output
terminator is performed, and no terminator translation takes place.