Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 142)

II. SOFTWARE GUIDES - 8. Driver488/DRV 8P. Command Descriptions
Personal488 User’s Manual, Rev. 3.0 II-127
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addr : An IEEE 488 bus address. A numeric primary address optionally followed by a
secondary address, or a device name. Thus, addr is of the form {name|pri-addr[sec-addr]}
where name is a device name, pri-addr is a primary address, and sec-addr is a two-digit
secondary address.
•
[,addr...] : An optional list of bus addresses, each one preceded by an address separator;
either a comma ( , ) or a blank.
No more than 50 bus addresses are allowed in any single command.
Character Count
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#count : The number of characters to be transferred, using a pound sign ( # ) followed by an
integer in the range 1 to 4,294,967,295 (or 2 32 - 1). It may be specified in hexadecimal by
preceding it with &H or 0X . The hexadecimal range is &H1 to &HFFFFFFFF . A character count of
zero is invalid.
ASCII Characters
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$char : A single character whose ASCII value is the number char , a decimal number in the
range 0 to 255 or a hexadecimal number in the range $H0 to $HFF , or &H0 to &HFF . For example,
65 is the letter A , as is $41 or &H41 .
•
CR : The carriage return character ( $13 , $0D or &H0D ).
•
LF : The line feed character ( $10 , $0A or &H0A ).
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‘X : Any (usually) printable character. The apostrophe is immediately followed, without any
intervening spaces, by a single character that is taken as the character specified.
For a complete description of ASCII control codes and character sets, refer to the tables in “Section V:
Appendix” of this manual.
ASCII Character Strings
•
data : An arbitrary string of characters. None of the special forms given above ( $char , CR , LF ,
or ‘X ) are used. For example, CRLF as data is taken as the letters: C , R , L , and F , not as carriage
return line feed CR LF .
•
‘data’ : An arbitrary string of characters enclosed in apostrophes.
Terminators
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term : Any single character, specified as CR , LF , ‘X , or $char as described above
( {CR|LF|’X|$char} ). Part of terminator sequence used to mark the end of lines of data and
commands.
•
[term] : An optional term character. For example, term[term] means that one or two
terminators may be specified.
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EOI : The IEEE 488 bus end-or-identify signal. When asserted during the transfer of a character,
EOI signals that that character is the last in the transfer. On input, ΕΟΙ , if specified, causes the
input to stop. On output, EOI causes the bus EOI signal to be asserted during transmission of the
last character transferred.
•
NONE : The no end-of-line characters indicator. When EOL OUT NONE is specified,
Driver488/DRV assumes that entire, complete, commands are transferred with a single DOS-level
output command. When
EOL IN NONE is specified, Driver488/DRV does not append any input
terminators to received data.
I/O Base Address
•
ioaddr : The I/O base address for the interface card, in the range &H0 to &HFFFF , usually
specified in hexadecimal, though decimal is allowed.