IBM AT Compatible High Performance Multifunction I/O Boards (Analog I/O)

The RTI-834/RTI-835 are high performance multifunction

analog and digital I/O boards that plug into expansion slots in

the IBM AT or compatible microcomputers. Their functions

include analog input, analog output (RTI-835 only), digital I/O

and time related I/O functions.

The boards provide data acquisition capability for 16 single-ended

or 8 differential analog inputs with optional expansion to

32 single-ended or 16 differential analog inputs. The analog-to-digital

converter has 12-bit resolution and is a sampling ADC

(built-in SHA). The RTI-834H and RTI-835H are high level

input boards and have software programmable gains of 1, 2, 4

and 8. The RTI-834L and RTI-835L are low level input boards

and have software programmable gains of 1, 10, 100 and 500.

The RTI-835H and RTI-835L provide two analog output channels

each using a 12-bit D/A converter. The boards also provide

16 bits of digital I/O, which are bit configurable as input or

output, and four external counter/timer channels. These counter/

timer channels can be used for event counting, frequency measurements

or pulse outputs.

There are no jumpers on the RTI-834/RTI-835. The following

configuration options are software-selectable: analog input voltage

range, analog-to-digital converter coding, single-ended/

differential inputs, analog output voltage ranges, interrupt level

and DMA channel. The base address of the board is selected

using an on-hand DIP switch, which helps avoid address conflicts

at power up.