Xycom XVME-560 Manual page 41

XVME-560 Manual
September, 1984
single-ended input, or jumpers J16 and J15 must be installed for differential input.
Potentiometer R18 is adjusted to again provide the zero reading.
Be sure that if calibrating in the unipolar mode, the zero reading is not a result of an
under-range condition (below the range of the A/D). This can be easily avoided by
adjusting R18 for a count of OOOlH, and then backing off R18 until the reading just
goes to 0000H. Jumpers J18 and
The third step is to calibrate the gain. To do this, a voltage standard is required. The
accuracy of the voltage standard will directly affect the accuracy of this procedure.
Therefore, it is up to the user to determine the accuracy to which the board is to be
calibrated and used, and to choose an appropriately accurate voltage standard. With
the voltage standard, a full scale value minus 1 l/2 LSB must be applied to channel 0.
The programmable gain should be set to unity gain for this procedure. The gain
potentiometer, R17, is adjusted until readings toggle equally between the transition
points as described in Table 3-7.
3.10 XVME-560 IDENTIFICATION
For easy identification in a VMEbus
at addresses (base address + 1) to (base address + 3FH) in the odd bytes only (see
Figure 3- 1).
The AIN uses the XYCOM module identification scheme which provides a unique
method of storing module specific information in an ASCII encoded format. The I.D.
data is provided as thirty-two ASCII encoded characters consisting of the board type,
manufacturer identification, module model number, number of 1K byte blocks occu-
pied by the module, and model functional revision level information. This information
can be read by the system processor on power-up to verify the system configuration
and operational status. Figure 3-8 defines the Identification information locations.
J19 can now be removed.
system configuration, I.D. information is located