National Instruments GPIB-SCSI-A, Руководство пользователя

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Chapter 4 Programming in S Mode
© National Instruments Corp. 4-11 GPIB-SCSI-A User Manual
S Mode Functions
The GPIB-SCSI-A S mode functions are divided into three main groups:
GPIB functions, SCSI functions, and General Use functions.
GPIB Function Group
The GPIB functions are divided into subgroups. Table 4-2 lists these
subgroups with the most frequently used groups listed first. Often, the I/O
and bus management functions are the only ones you need.
Table 4-2. GPIB Function Group
Function Opcode Description
I/O Functions:
brd
0xDD Low-level read GPIB data
bwrt
0xDC Low-level write GPIB data
rd
0xCF High-level read GPIB data
wrt
0xDB High-level write GPIB data
Bus Management
Functions:
clr
0xC2 Clear specified device
lines
0xC3 Examine the state of the GPIB control
lines
loc
0xCA Place specified device in local mode
trg
0xD9 Trigger selected device
(continues)