Xycom XVME 590 Manual page 27

XVME-500/590 Manual
February, 1988
2.6 ANALOG-TO-DIGITAL (A/D) CONVERSION OPTIONS
2.6.1 Input Conversion Format Jumpers
This jumper option is used to configure A/D conversion circuitry to convert analog
information to one of three formats:
(bipolar); or two's complement binary (bipolar).
Use of this option is dependent upon the data format required by the input control
program employed by the user. This option is inclusive to all input channels and
cannot be utilized on an individual channel basis (see Section 3.3.4.1).
The digital-data format at the A/D converters may be changed (via jumpers) to
accommodate several types of data encoding.
control the data formats for the two different voltage modes.
Digital Data Conversion
Format ( All Inputs)
.
Analog to Straight Binary
Analog to Offset Binary
Analog to Two's Complement
2.6.2 Differential,
(Analog Multiplexers) (J21, J25)
The XVME-500/590 can be configured to provide any one of three types of channel
modes in set numbers (see Table 2-6 for input selection jumper options) They are:
1) 16 single-ended (SE) input channels, or
8 differential (DI) input channels, or
2)
16 pseudo-differential (PDI) input channels (allows module to simulate
3)
advantages of true differential with some degradation)
The three modes are mutually exclusive so the module will only accept all SE, or all
DI, or all PDI inputs. It will not accept combinations of the three.
Table 2-5. Input Conversion Format Jumpers
Pseudo-Differential/Single-Ended
(Jl, J4)
straight binary (unipolar); off set binary
Table 2-5 shows which jumpers
Jumpers
Installed
JlA, J4A
JlA, J4A
JlB, J4B
Input
2-11
Input
Mode
Unipolar
Bipolar
Bipolar
Option Jumpers