Measurement Computing CIO-QUAD04 - Support for the MC CIO-QUAD04 counting board

Board

Measurement Computing CIO-QUAD04

General Description

The CIO-QUAD04 is a 24-bit counting board with 4 channels. This board typically connects to incremental encoders. Incremental encoders convert physical motion into electrical pulses that can be used to determine velocity, direction, and distance.

The xPC Target block library supports this board with this driver block:

• Measurement Computing CIO-QUAD04 Incremental Encoder

See Measurement Computing CIO-QUAD04 Incremental Encoder if you have an earlier version of this driver.

Note on usage:

There is a hardware limitation with the CIO-Quad04 boards in the way that they handle unconnected inputs. Even with the Index input resets counter check box disabled, noise on the index input line might cause the counter chip on the board to latch a value that differs from the actual value by a multiple of 256. The frequency of occurrence of the bad reads depends on the count frequency coming from the encoder. High count rates result in more bad reads.

To work around this issue, try the following:

1. If the index signal from an encoder is not being used, connect the index inputs.

2. Connect the index+ input to +5 volts.

3. Connect the index- input to ground.

These connections should be made as close to the board as possible to minimize any crosstalk at high count frequencies.

Board Characteristics

Board name	CIO-QUAD04
Manufacturer	Measurement Computing
Bus type	ISA
Access method	I/O mapped
Multiple block instance support	Yes
Multiple board support	Yes

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