July 2001
J. D. Monnier

Notes on Installing A-to-D board: VMIVME 3124 (by VMIC)
 **  Updated on 2001Jul 04 to reflect new base address
 **  Updated on 2001Jul06 to reflect config change to differential inputs

>From VMIC Manual:

Section 5.3.1. Board Address
----------------------------

Here are the currently installed board base addresses from MBrewer:
   
   D/A board:		0x0100 - 0x0108
   DIO board:		0x1000 - 0x1032
   Serial board:	0x6000 - 0x60FF
   Galil board:		0xF000 - 0xF7FF

We will choose

   A/D board:   0x0400 -  [128 bytes] - 0x047E
   [Removed Jumper E6, the Rest E1->E9 are ON]
  
*****IMPORTANT*****
  
ACCORDING to the manual this should correspond to 0x4000, but the
board seems to answer 0x0400 in software.  So note that the jumpers
look like they should be defining the address 0x4000.  If I ever come
up with a better explanation of why this discrepancy, I will let you
know.

Section 5.3.2. Address Modifier
-------------------------------

We do not know what to do here.  The factory settings are: NONE which
means to allow both "Supervisory" and "Nonpriviledged" Addressing
Mode.

We decided to go with both, and we used (in software) address modifier
0x29 (see vme.h, correspond to NONpriviledged)

E10: No Jumper

Section 5.3.3. Input Configuration
----------------------------------

These jumpers are important. They setup the inputs as either
differential or single-ended, and the input control voltage range, and
the internal gain before digitization.

After discussing this with WT, We decided to go with the factory
settings:

  16-channel differential inputs
  +/- 10 Volt Range
  Unity Gain

** Remove Jumpers E14,E15. Install E16
** Install Jumpers E19 pins 1/2, E20 pins 2/3
** Remove jumpers e18,e17

** We measured the input noise using a DC voltages source for both
differential and single-ended operation. We found that the
single-ended operation has less noise (~1bit,4.8mV) while the
differential had about twice as much noise (~2bit,10mV).

JP and I wrote the code to setup shared memory and the ADC
object/class.  Also test programs adctest, adcrecord.  It is now in:
iota17:~iota/iotamc/vxworks/daq/*