IOD-24
Digital Input/Output Card
FEATURES
- 24,
72, and 120 channels of TTL digital I/O lines.
- All
I/O lines buffered by tristate transceivers. Outputs
sink 24mA and source 15mA.
- Four-
and eight-bit groups independently selectable for I/O.
- Pull-up
resistors to provide CMOS and contact closure compatibility.
- Cable
crosstalk suppression by grounds on all even-numbered
conductors.
- 50-pin
connector for compatibility with Western Reserve Controls,
Opto-22, Gordos, Potter and Brumfield, etc.
-
External
interrupts.
FUNCTIONAL
DESCRIPTION
These
are 24-, 72-, and 120-bit half-size, 3/4-size, and full-size
cards respectively. A Programmable Peripheral Interface
chip, type 8255-5 provides three 8-bit ports (A, B, and
C) for each 24-bit group. Each port can be independently
programmed for either input or output. Port C can also be
configured as two 4-bit ports. These cards fully implement
Mode 0 of the 8255 PPI chip. (Consult the factory if you
desire to operate in Mode 1.) Type LS245 bi-directional
transceivers sink 24 mA (optionally 64 mA) and source 15
mA. These transceiver buffers provide hysteresis correction
on inputs and added drive capability on outputs. The direction
of the transceivers is set by software.
Input/Output
connections to IOD-24 are via a 50-pin connector on the
mounting bracket. I/O connections to IOD-72 and IOD-120
are via 50-wire ribbon interface cables that extend through
rectangular cut-outs in the mounting bracket and plug into
headers on the card. Units required to meet EU "CE" requirements
are supplied with blank mounting brackets. That permits
you to use cabling method's that best fit your application.Strain
relief is provided for these cables. Ready-made displacement
type ribbon cables are available from ACCES as p/n CAB50F-xx.
(See the Accessories section of this catalog.) Alternate
wires are connected to ground to provide shielding and minimize
crosstalk.
On
models IOD-72 and IOD-120, you can enable/disable the I/O
buffers under program control. If this is needed in a 24-bit
application, a de-populated version of IOD-72 is available
at reduced cost. Also, if only 96-bit operation is needed,
there is a jumper on the IOD-120 to set that mode of operation.
At each 24-bit port, two of the I/O lines can be used for
User Interrupts; one line to enable/disable this function
and one for the external interrupt signal. Interrupt levels
2-7 are selected by jumper on IOD-24. Interrupt levels 2-7,
10-12, 14, and 15 can be jumper selected on IOD-72 and IOD-120.
Card
I/O bus address selection is by DIP switches on the cards.
The address can be anywhere in I/O space. On power-up or
reset, all ports are automatically configured as inputs.
This prevents spurious outputs. Before use, of course, each
PPI should be software configured by writing to its control
register.
SPECIFICATIONS
Digital
Inputs
- Logic
High: 2.0 to 5.0 VDC
- Logic
Low: -0.5 to 0.8 VDC
- Input
Load (Hi): +20 microamperes
- Input
Load (Lo): -200 microamperes
Digital
Outputs
- Logic
High: 2.5 VDC min.,source 15 milliamperes
- Logic
Low: 0.5 VDC max., sink 24 milliamperes (64 milliamperes
optional)
DC
Power Output
- +5
VDC computer power. 1A fuse included on IOD-24.
Environmental
- Power
Required: +5 VDC: IOD-24:200mA, IOD-72:350mA and IOD-120:450mA
- Size:
IOD-24:5.0" Long (12.7cm), IOD-72:8.75" Long (22.23cm)
and IOD-120:13.310" Long (33.8cm)
- Operating
Temperature Range: 0o to 60 oC
- Storage
Temperature Range: -50o to 120 oC
- Humidity:
0 to 90% RH, non-condensing
Regulatory
Compliance 
Declaration of Conformity, and Test Reports are on file.
Users must use appropriate shielded cables.
| Part
Number |
Price(USD)
|
| IOD-24 |
66.00
|
View / Download Manual (in
.PDF format)
