digit is the interface select code, which is set to 7 at the fac-
tory. The last two digits of those statements requiring a
3-d@ argument specify the primary address.
Those statements with a 3-digit argument listed in the table
shown a primary address of 27 (the default primary address
of the Model 617). For a different address, you would, of
course, change the last two digits to the required value. For
example, to send a GTL command to a device using a
primary address of 22, the following statement would be
used: LOCAL 722.
Some of the statements have two forms; the exact configura-
tion depends on the command to be sent over the bus. For ex-
ample, CLEAR 7 sends a DCL command, while CLEAR 727
sends the SDC command to a device with a primary address
of 27.
The Model 8573 statements, which are also listed in Table
3-6, take on a somewhat different form. Each of these state-
ments uses the IBM BASIC CALL statement, with various
variables passed as shown in the table. The command words,
such as IBCLR (Interface Bus Clear) and IBSRE (Interface Bus
Send Remote Enable), are, in fact, BASIC variables
themselves, which must be initialized at the start of each
BASIC program. In addition, you must remember not to use
these keywords for any other purpose in your BASIC pro-
gram.
Before using the Model 8573 examples throughout this sec-
tion, you must configure the software by using the procedure
below. Note that the binary handler file called GPIB.COM
and the system configuration file called CONFIGSYS must
be present on the DOS boot disk, as described in the Model
8573 Instruction Manual.
1. Boot up your system in the usual manner and enter
BASICA.
2. Place the Model i573 software disk into the default drive
and load the program called “DECL.BAS”. Modify the
program by changing the XXXXX values in lines 1 and 2 to
16000.
3. Add the followine lines to the declaration file:
7 NA%=“GPIBO’:CALL IBFIND(NAS,BRDO%)
8 NA$=“DEVO”:CALL IBFIND(NA$,M617%)
9 V%=27:CALL IBPAD(M617%.V%)
4. Now save the modified declaration file for future use.
Remember that you must load and run this short program
before using the Model 8573 programming examples
throughout this section. Also, do not use the BASIC
CLEAR or NEW commands after running this program.
Table 3-6. BASIC Statements Necessary to Send Bus Commands
Action
HP-65 Statement
Transmit string to device 27. 1 OUTPUT 727;AS
Obtain string iom device 27. ENTER 727; AS
Send GTL to device 27.
LOCAL 727
Send SDC to device 27.
CLEAR 727
Send DCL to all devices.
CLEAR 7
Send remote enable.
REMOTE 7
Cancel remote enable.
LOCAL 7
Serial poll device 27.
SPOLL (7271
Send local lockout.
LOCAL LOCKOUT 7
Send GET to device.
TRIGGER 727
Send IFC.
ABORT10 7
Model 6573 Statement
CALL IBWRT IM617%, CMDS)
CALL IBRD lM617%, RDSI
CALL IBLOC lM617%)
CALL IBCLR lM617%)
CMDS=CHRS (EtH14): CALL IBCMD (BRDO%, CMDS)
V% = 1: CALL IBSRE (BRDO%, V%j
V%=O: CALL IBSRE lBRDO%, V%)
CALL IBRSP (M617%, SB%)
CMDS=CHRS (EtHll): CALL IBCMD (BRDO%, CMDS)
CALL IBTRG lM617%)
CALL IBSIC (BRDO%l
3-11
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