Remote Operation 11-9
Then initialize the interface card as address 21:
CALL INITIALIZE (21, 0)
Initialize also sends out an interface clear (IFC) to the entire GPIB system to initialize the
other devices (see “General bus commands, IFC (interface clear)”).
A typical program fragment includes a CALL SEND command and a CALL ENTER
command. The CALL SEND command sends a program message (command string) to the
Model 2182. If the program message includes a query command, then the CALL ENTER
command is required to get the response message from the Model 2182. The CALL ENTER
command addresses the Model 2182 to talk. The following example program fragment
demonstrates how CALL SEND and CALL ENTER commands are used. Note that the
commands assume address 07, which is the factory-set address of the Model 2182.
CALL SEND (7, “*rst”, status%)
CALL SEND (7, “:read?”, status%)
To display the response message on the CRT, the computer has to read the message and then
“print” it to the computer display as follows:
reading$ = SPACE$(80)
CALL ENTER (reading?, length%, 7, status%)
PRINT reading$
The following programming example shows how all the above statements are used together:
$INCLUDE: ‘c:\qb45\ieeeqb.bi ‘ Include QuickBASIC libraries.
CALL INITIALIZE (21, 0) ‘ Initialize card as address 21.
CALL SEND (7, “*rst”, status%) ‘ Restore 2182 to *RST defaults.
CALL SEND (7, “:read?”, status%) ‘ Trigger and request a reading.
reading$ = SPACE$(80) ‘ Allocate room for data.
CALL ENTER (reading?, length%, 7, status%)
‘ Address 2182 to talk.
PRINT reading$ ‘ Display reading on CRT.
General bus commands
Commands and associated statements
General commands are those commands, such as DCL, that have the same general meaning
regardless of the instrument. Table 11-1 lists the general bus commands along with the
programming statement for each command.
Table 11-1
General bus commands and associated statements
Command Programming Statement Effect On Model 2182
REN
IFC
LLO
GTL
DCL
SDC
GET
SPE, SPD
REN
CALL INITIALIZE
LLO
GTL
DCL
SDC
GET
SPOLL
Goes into remote when next addressed to listen.
Reset interface; all devices go into talker and listener idle states.
LOCAL key locked out.
Cancel remote; restore front panel operation for the 2182.
Return all devices to known conditions.
Returns Model 2182 to known conditions.
Initiates a trigger.
Serial Polls the Model 2182.
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