HP E1418A - Manual (Page 139)

Notes Each incremental value of the A24 Window offsets the window by 32 bytes.
Up to 512 bytes of A24 space can be pointed to.
A24 Window values 8
16
through F
16
point to Calibration Registers.
Calibration Registers 00100
16
through 001BE
16
are located in non-volatile
(FLASH) memory. Writing to this memory requires a complicated sequence
of register accesses not documented here. It is recommended that calibration
be performed using the SCPI driver for the module, not register access.
Main_DAC
Immediate
Registers
The Main_DAC Immediate Registers are used to program the next output
value on a channel. There are 16 registers, one for each output channel. The
register at base + 40
16
programs channel 1, base + 42
16
programs channel 2,
up to base +5E
16
to program channel 16. Values loaded in these registers are
applied to the output immediately (no trigger condition is required).
Address
Base + 40
16
through
Base + 5E
16
Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
WRITE
Output Value
Output Value: Writing a 16-bit value to this field outputs the value on the
channel selected by the base address. The 16-bit value is a 2’s complement
number. Scaling is based upon 16 V maximum for voltage mode and .020
Amps for current mode.
Main_DAC
Triggered Registers
The Main_DAC Triggered Registers are used to program the next output
value on a channel. There are 16 registers, one for each output channel.
The register at base + 60
16
programs channel 1, base + 62
16
programs
channel 2, up to base +7E
16
to program channel 16. Values loaded in these
registers are applied to the output(s) following the next trigger event.
Address
Base + 60
16
through
Base + 7E
16
Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
WRITE Output Value
Output Value: Writing a 16-bit value to this field outputs the value on the
channel selected by the base address. The 16-bit value is a 2’s complement
number. Scaling is based upon 16 V maximum for voltage mode and
.020 Amps for current mode.
138 HP E1418A Register-Based Programming Appendix B
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