Xycom XVME 590, Manual

Page: 28 / 102

XVME-500/590 Manual
February, 1988
NOTE
Only one of the three jumper configurations may be
installed at any one time. Make sure that:
1) If the board is to be used in the SE input mode,
the jumpers for DI and PDI operation must be
removed; 2) If the board is to be used in the DI
input mode, the jumpers for SE and PDI operation
must be removed; and 3) If the board is to be used
in the PDI input mode, the jumpers for SE and DI
operation must be removed.
The pseudo-differential option allows 16 input channels, as does the single-ended
option.
Unlike the SE channel, the PDI mode uses a common analog ground (pin
JKl-49) to simulate true differential input (Important, see Section 2.6.4.5).
Addition of the XVME-910 (see Appendix A) increases the number of analog
multiplexers from two to four.
As a result, the number of available input channels
doubles as follows: SE and PDI increase to 32; DI increases to 16.
Table 2-6. Single-Ended/Differential, Pseudo-Differential Jumper Options
Jumpers Set
J21A,J21C,J25
Input Mode
Set in this manner, the module inputs
are configured for single-ended opera-
tion.
J21B
In this manner,the module inputs are
configured for differential operation.
J21A,J21D,J25 This combination of jumpers configures
the module for pseudo-differential oper-
ation.
In addition to the SE/D1 jumpers mentioned, two other jumpers are provided to
allow grounding of an input channel (in either the SE or DI mode). This is done to
allow software to automatically correct any drift in the ADC offset adjustment. In
the SE mode, J23 (Channel 0) or J24 (Channel 8) may be inserted. In the differ-
ential mode, both J23 and J24 (Channel 0) must be inserted.
2.6.3 Input Voltage Type and Voltage Range Selection (J3, J5)
The analog inputs may be configured to accept either unipolar or bipolar full-scale
input voltages.
Jumpers J3 and J5 determine which voltage type the module will
accept.
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