Agilent Technologies E1326B Bedienungsanleitung PDF herunterladen (Seite 203)

The Command and

Parameter Registers

Commands and their parameters are opcodes written to the Command and

Parameter Registers.

Address 15 - 8 76543210

base + 08

Not Used Command Opcode

Address 15 - 8 76543210

base + 0A

Not Used Parameter Opcode

Command Structure. Multimeter commands consist of a command

opcode and a parameter opcode (which may be optional). The opcodes

must be in 2’s complement binary format when written to the registers.

An example of how to write to the Command and Parameter Registers is

shown in the following statements. The statements set the multimeter

function (command opcode 4) to DC voltage (parameter opcode 0):

!Write command

iwpoke((unsigned short *)(base_addr_dmm + 0x08),4)

!Write parameter

iwpoke((unsigned short *)(base_addr_dmm + 0x0A),0)

When the command and parameter are received, the multimeter processor

checks for the proper syntax and range. If an error is found, the NOERR bit in

the Status Register is cleared (0), and operation continues (if it is possible).

Note When you are writing (sending) commands and parameters, the multimeter

needs time to process the current command before the next command is sent.

204 HP E1326B/E1411B Multimeter Register-Based Programming Appendix C

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Agilent Technologies E1326B Bedienungsanleitung Seite 203