- GPIB-PC User Manual for the IBM Personal Computer and Compatibles April 1988 Edition Part Number 320014-01

BASICA/QuickBASIC GPIB-PC Function Calls Section Four A
GPIB-PC User Manual 4A-22 ©National Instruments Corp.
6. Unaddress all Listeners and serially poll a device at talk
address &H52 (ASCII R) using the Serial Poll Enable (SPE or
&H18) and Serial Poll Disable (SPD or &H19) commands (the
GPIB-PC listen address is &H20 or ASCII space).
100 CMD$ ="?R " + CHR$(&H18)'UNL TAD MLA SPE
110 CALL IBCMD (BRD0%,CMD$)
120 RD$ = SPACE$(1) ' Declare RD buffer.
130 CALL IBRD (BRD0%,RD$)
140 REM After checking the status byte in
150 REM RD$, disable this device and
160 REM unaddress it with the Untalk.
160 REM (UNT or ASCII _) command before
170 REM polling the next one.
180 CMD$ = CHR$(&H19) + "_" ' SPD UNT
190 CALL IBCMD (BRD0%,CMD$)