National Instruments NI-488.2 Benutzerhandbuch

© National Instruments Corporation

Decimal numbers—Enter the number only. For example, 

ibpad 22

 sets 

the primary address to 22 decimal.

You can enter strings as an ASCII character sequence, hex bytes, or special 
symbols. 

ASCII character sequence—You must enclose the entire sequence in 
quotation marks. 

Hex byte—You must use a backslash character and an 

x

, followed by the 

hex value. For example, hex 40 is represented by 

\x40

. 

Special symbols—Some instruments require special termination or 
end-of-string (EOS) characters that indicate to the device that a 
transmission has ended. The two most common EOS characters are 

\r

 and 

\n

. 

\r

 represents a carriage return character and 

\n

 represents a linefeed 

character. You can use these special characters to insert the carriage return 
and linefeed characters into a string, as in 

"*IDN?\r\n"

. 

Some of the NI-488.2 calls have an address or address list parameter. 
An address is a 16-bit representation of the GPIB device address. The 
primary address is stored in the low byte and the secondary address, if any, 
is stored in the high byte. For example, a device at primary address 6 and 
secondary address 0x67 has an address of 0x6706. A 

NULL

 address is 

represented as 0xffff. An address list is represented by a comma-separated 
list of addresses, such as 

1,0xb706,3

.

Tables 7-1 and 7-2 summarize the syntax of the traditional NI-488.2 calls 
in the Interactive Control utility. Table 7-3 summarizes the syntax of the 
multi-device NI-488.2 calls in the Interactive Control utility. Table 7-4 
summarizes the auxiliary functions that you can use in the Interactive 
Control utility. For more information about the function parameters, use 
the online help, available by typing in 

help

. If you enter only the function 

name, the Interactive Control utility prompts you for parameters.