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Manual Number: 00650-004-5
Page 2-2
ADIO1600 Manual
Discrete Digital I/O
Four bits of TTL/CMOS-compatible digital input capability are provided at the mounting panel con-
nector. Twenty-four additional digital I/O bits are available at the auxiliary connector on the board
which are available at a backplate connector via a ribbon cable extension from the auxiliary connec-
tor. Digital inputs IP0 and IP2 have dual uses. Input IP0 provides an external trigger for the A/D.
Input IP2 is also the gate input for Counter/Timer 0. Note that the use of the Counter prevents use
of IP2.
Four bits of digital output are available with powerful LSTTL logic level load drive capability. Dis-
crete outputs OP0 through OP3 provide multiplexer addressing for input expansion card use, as
described in the
INPUT SYSTEM EXPANSION
section, or as separate digital outputs.
Additionally, OP0 through OP3 can be individually software configured for use as additional TTL/
CMOS-compatible digital inputs, providing a total of up to eight Digital Inputs at the rear panel
connector.
The auxiliary digital I/O port is from a 8255 Programmable Peripheral Interface which provides 24-
bits of bi-directional input/output bits configured as two sets of 8-bit and two sets of 4-bit digital
input/output ports. This port is extended using a ribbon cable from the side of the board to a 37-pin
connector on a rear mounting bracket.
Counter/Timer
The ADIO1600 contains a type 8254 counter/timer which has three 16-bit programmable down
counters. Counter/Timer #0 is enabled by a digital input (IP2) and uses either the internal 1MHz
clock or an external clock of up to 10 MHZ. Counter/Timers #1 and #2 are concatenated and form
a 32-bit counter/timer for timed A/D trigger pulses and/or external frequency generation. The dual
counter/timer can be enabled by program control and clocked by a 1 MHZ on-board crystal oscilla-
tor source. Counter #2 may be set to generate an interrupt request (IRQ) upon completing a
counter period.
Counter/Timer 0 and Counter/Timers 1 and 2 can be set up for event counting, frequency or period
measurements, and pulse or wave form generation. Also, Counter/Timers 1 and 2 can be pro-
grammed to initiate A/D conversions. See the
PROGRAMMABLE INTERVAL TIMER
sec-
tion of this manual for a description of ways that the type 8254 counter/timer chip can be used.
Analog Output
The ADIO1600 has two 12-bit digital-to-analog converters (D/A) connected to output drivers ca-
pable of providing 5 mA current drive. By selecting on-board jumpers outputs of 0-5 VDC, 0-10
VDC, 0-2.5 VDC, ±2.5 VDC, ±5VDC, or ±10 VDC are possible.
Interrupts
Interrupts can be initiated by completion of an A/D conversion or Counter timeout if programmed by
software. Interrupt levels 2-7, 10-12, 14 and 15 are selectable via jumpers.
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