HP 8648 A/B/C/D - Changpuak.ch

Example: Generate a Service Request for External
Modulation
Input (High& or Low)
18 I-II ITPIJT
-- 7 1-3; “:3-/-HT: QIJE!;: MI]D: Et.#B 3”
28 l:liJTPlJT 719; “!s-j-HT: QIJE!;: Et#=@ 12:8”
:3@ I:IIJTF’IJT 71’3; “%!;RE :s”
48 IF SPOLL~71’3> THEt.4 PRItdT “Ext. . Plod. Inp~f. Hig/-g...,‘LI:r:ll,,
El&. et:t. @d ‘I
50 I:IIJTPIJT 71’3; “WI:&”
En 8 E 1.1 [r
Line 10 Enables bits 0 and 1 (decimal equivalent 3) in the
MODulation register. Enabling these bits masks other
bits in the MODulation register from reporting their
status in the summary bit to QUEStionable.
Line 20 Enables bit 7 (decimal equivalent 128) in the
QUEStionable register. Enabling this bit masks other
bits in the QUEStionable register from reporting their
status in the summary bit to STATUS.
Line 30 Enables bit 3 (decimal equivalent 8) of the STATUS
register. Enabling this bit masks other bits from
reporting.
Line 40 Uses the HP BASIC command, SPOLL, (Serial Poll)
to see if the service request bit is reporting any
interrupts.
Line 50 Clears all status registers. Clearing the status registers
is not absolutely necessary, but is used here because
of the unknown state of the instrument.
HP-16 Programming 2-15