National Instruments GPIB-PC - Manual (Page 150)

Section Four A BASICA/QuickBASIC GPIB-PC Function Calls
©National Instruments Corp. 4A-75 GPIB-PC User Manual
2. To exclude the local ability of the device to return to local
mode, send the Local Lockout (LLO or &H11) command or
include it in the command string at 120 in Example 1.
100 CMD$ = CHR$(&H11)
110 CALL IBCMD (BRD0%,CMD$)
or
100 CMD$ = "#" + CHR$(&H11)
110 CALL IBCMD (BRD0%,CMD$)
3. Return all devices to local mode.
100 V% = 0 ' Set REN to false
110 CALL IBSRE (BRD0%,V%)