Lawson Labs, Inc.

Specification Sheet

MODEL 202 24-BIT DATA ACQUISITION SYSTEM

External A/D Converter Systems

Serial Port Interface

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Manual
.rtf .pdf

Sample applications

Source code
(with sample applications)

The Model 202 is identical to the Model 201 with the following exceptions

Power requirement +/- 12VDC at 80 milliamps (no sleep mode).

There are 2 (not 8) digital inputs.

The connectors are screw terminal type except the serial connector which is a 10-pin header with extension cable.

The filter cut-off frequency is fixed (usually 500 Hz).

The digital outputs are buffered by gain-of-one amplifiers.

Size is 6.5 x 4.8 x 1 inches.

Two DACs have been added. Resolution is programmable up to 16 bits. Settling time increases with resolution. It is 3 seconds at 14 bits.

DACs A & B are wired to input channels 4 and 5 respectively.

PINOUT

x	+12VDC
x	GROUND
x	-12VDC

Analog inputs

Analog out

Digital outputs

Dig-Inp

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Subtract 1 from analog and digital input labels for addressing. For example, analog input channel 0 is labeled input 1.

Only the 2 least significant bits of the digital input word are used.

The sleep command is not valid.

The filter command is deactivated.

The lower 4 bits of the control register are now used as DAC controls.

Command token 7 is now used to load the DAC counter registers.

Details for loading the DACs are found at the end of the driver source listing. The driver uses a "Z" keypress to access the DACs.

In scanning mode, the external control code must be 8 to enable the DACs. Use external code 0 to disable the DACs.

There is no expansion connector.

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