HP E1429A manual Reading and Writing to the Registers, Register reads and writes are 8-bits

Reading and Writing to the Registers

Note

Each program uses a combination of SCPI commands and register reads/writes. In most cases SCPI commands set the initial digitizer configuration. Register reads/writes are used to modify the configuration, re-initialize the digitizer, and retrieve readings.

The examples in this appendix are based on the system configuration listed previously. With this configuration, the digitizer’s A24 registers are read, and written to, using the HP E1406 Command Module’s DIAGnostic:PEEK?, DIAGnostic:POKE, and DIAGnostic:UPLoad:SADDress? commands:

DIAGnostic:PEEK? <address >, <width >

DIAGnostic:POKE <address >, <width >, <data >

DIAGnostic:UPLoad:SADDress? <address >, <byte_count >

<address > - the address (A24 base address + register offset) of the register.

<width > - the number of bits read (DIAG:PEEK?), or the number of data bits written to the register (DIAG:POKE). Unless otherwise noted,

register reads and writes are 8-bits.

<data >- the integer data written to the register.

<byte_count >- the number of reading bytes uploaded (read) from digitizer memory. Since each reading is two bytes, byte_count is equal to 2 times the number of readings to upload. In the example program at the end of this appendix, DIAGnostic:UPLoad:SADDress? is used to retrieve all the readings from memory once the digitizer has been re-initiated.

With an embedded controller, the Standard Instrument Control Library (SICL), and the programming procedures found in this appendix, higher throughput rates can be achieved than the rates available with the system configuration listed. To use these procedures, note the A24 address mapping of the embedded controller, and replace DIAG:PEEK?, DIAG:POKE, and DIAG:UPL:SADD? with the appropriate SICL reads and writes.

342 Register Programming Appendix C