HP E1326B User Manual page 264

Multimeter Command
Parameter Opcode
Voltmeter
Complete Signal
Destination
Sample Count
Sample Source
Sample Period
(5)
Software Sample
(6)
Trigger Arm
Trigger Immediate
Send Error
(1) Specified as a 2's complement binary number. For three byte parameters <upper byte> = value shifted 16 bits to the
right (>>16), <middle byte> = value shifted 8 bits to the right (>>8), <lower byte> = value. For two byte parameters
<upper byte> = value shifted 8 bits to the right (>>8), <lower byte> = value & 0xFF.
(2) Reading the Query Response Register two times (16-bit number) or three times (24-bit number) returns in order; the
high byte, middle byte, and low byte.
(3) A parameter value of 0 sets infinite triggers per trigger arm.
(4) A parameter value of 0 sets infinite samples per trigger.
(5) Set when Sample Source is Timer.
(6) Used when Sample Source is Software. The first measurement of each burst occurs when the trigger signal is
received (e.g. Trigger Immediate). Subsequent measurements in the burst occur when Software Sample is written to the
Command Register.
(7) Up to seven VXIbus TTLTrg trigger lines can be selected. 01 selects line 0, FF selects all lines.
Appendix C
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Table C-2. Command and Parameter Opcodes (
Parameter
Opcode
40 8-bit binary number
(7)
38 <upper byte>
<middle byte>
<lower byte>
07 00
01
02
03
10 <upper byte>
<lower byte>
35 —-
12 00
01
13 —-
15 —-
HP E1326B/E1411B Multimeter Register-Based Programming
Query
Value Opcode
0 - 7
(TTL trigger lines)
1 - 16,777,215
(1),(4)
Immediate
Timer
Software
Control Register
76µs - 65.534ms (1)
—-
Un-armed
Armed
—-
—-
continued
)
Query
Response
41 8-bit binary number
32 24-bit unsigned
number
(2)
30 parameter
opcode
11 16-bit unsigned
number
(2)
—- ...
—- —-
—- ...
—- —-
263