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Products   >   I/O Expansion Modules   >   Digital I/O Modules   >   Onyx-MM-DIO
      ONYX-MM-DIO  Low-Cost 48-Line Digital I/O PC/104 Module   PC104
Onyx-MM-DIO: I/O Expansion Modules, Wide-temperature PC/104, PC/104-<i>Plus</i>, PCIe/104 / OneBank, PCIe MiniCard, and FeaturePak modules featuring programmable bidirectional digital I/O, counter/timers, optoisolated inputs, and relay outputs., PC/104
OverviewSpecificationsOrdering
Information
Support

Onyx-MM-DIO has 48 digital I/O lines using 2 82C55 ICs. Each chip has 24 I/O lines organized as three 8-bit ports, A, B, and C. All I/O lines are connected to 10KOhm pull-up resistors, and on power-up or system reset, all ports reset to input and are pulled high. A control register on the 82C55 chip allows you to program each port for input or output and for different operating modes, including basic I/O, strobed I/O, and bit set/reset.

Mode 0 operation provides basic input and output operations. No handshaking signals are used. This is the most common method of digital I/O and is useful for reading status signals, turning switches on and off, etc. All three ports can operate in Mode 0.

Mode 1 operation provides strobed I/O on ports A and B with handshaking signals provided on port C. In input mode, one signal is a strobe to latch data into the port, and a second signal is an acknowledge output. In output mode, one signal is used to indicate that the CPU has written new data to the port, and a second signal is an acknowledge input.

Mode 2 operation allows the use of Port A as a bidirectional data bus, with port C lines used for handshaking. Port A is normally in tristate mode. When the CPU writes new data to port A, an output signal indicates new data is available. In response, the external circuit strobes an acknowledge input signal, thereby enabling the output buffers on Port A. The external circuit can also latch new data into Port A with an input data strobe signal.

Bit set/reset mode enables individually setting (1) or resetting (0) any bit on Port C without having to read Port C and mask or protect unaltered bits.

Diamond's free Universal Driver software provides a comprehensive C programming library to control all the digital I/O features. Example programs are included with both source code and executables to assist you in developing your application quickly.

I/O Header Pinout

Onyx-MM-DIO contains 2 50-pin I/O headers with 24 I/O lines organized as 3 8-bit ports on each header. 5V power and Ground pins are also provided on each header.

J3 (Right Side)


(Port A) A7 1 2 Ground
A6 3 4 Ground
A5 5 6 Ground
A4 7 8 Ground
A3 9 10 Ground
A2 11 12 Ground
A1 13 14 Ground
A0 15 16 Ground
(Port C) C7 17 18 Ground
C6 19 20 Ground
C5 21 22 Ground
C4 23 24 Ground
C3 25 26 Ground
C2 27 28 Ground
C1 29 30 Ground
C0 31 32 Ground
(Port B) B7 33 34 Ground
B6 35 36 Ground
B5 37 38 Ground
B4 39 40 Ground
B3 41 42 Ground
B2 43 44 Ground
B1 45 46 Ground
B0 47 48 Ground
+5V 49 50 Ground

J4 (Left Side)


(Port D) D7 1 2 Ground
D6 3 4 Ground
D5 5 6 Ground
D4 7 8 Ground
D3 9 10 Ground
D2 11 12 Ground
D1 13 14 Ground
D0 15 16 Ground
(Port F) F7 17 18 Ground
F6 19 20 Ground
F5 21 22 Ground
F4 23 24 Ground
F3 25 26 Ground
F2 27 28 Ground
F1 29 30 Ground
F0 31 32 Ground
(Port E) E7 33 34 Ground
E6 35 36 Ground
E5 37 38 Ground
E4 39 40 Ground
E3 41 42 Ground
E2 43 44 Ground
E1 45 46 Ground
E0 47 48 Ground
+5V 49 50 Ground

Block Diagram

Onyx-MM-DIO: I/O Expansion Modules, Wide-temperature PC/104, PC/104-<i>Plus</i>, PCIe/104 / OneBank, PCIe MiniCard, and FeaturePak modules featuring programmable bidirectional digital I/O, counter/timers, optoisolated inputs, and relay outputs., PC/104

Cables

Onyx-MM requires 2 cables for the 48 GPIO signals. Each cable provides 3 8-bit ports along with +5V and ground connections.


Cable Description Drawing
C-50-18 50-conductor .1" pitch 18" ribbon cable, Data acquisition Cable (Each board uses 2) Show

Digital I/O
Chip 82C55A (qty. 2)
Number of I/O lines 48
Direction Programmable in groups of 4 or 8
Input voltage
Low: -0.5V min, 0.8V max
High: 2.0V min, 5.5V max
Output voltage
Low: 0.0V min, 0.4V max
High: 3.0V min, Vcc -0.4V max
Output current ±2.5mA max, each line
Pullup resistors 10KΩ all input lines
General
Power supply +5V ±10% @ 100mA typical, all outputs open
Temperature -40°C to +85°C
PC/104 Bus 8 bits
Weight 2.3 oz/65g
MTBF OMM-DIO-XT 1,714,901 hours
RoHS Compliant

Get an online quote

 
Onyx-MM-DIO
available models:
OMM-DIO-XT
Onyx-MM 48 Digital I/O only Extended Temperature
Min Order Quantity
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Cables and accessories
available models:
C-50-18
50-conductor .1" pitch 18" ribbon cable (Each board uses 2)
Please login or signup for an online quote request.

Product Support for Onyx-MM-DIO

User Manual

Onyx-MM-DIO Manual v1.4(.pdf, 337.5 KB)
Visit Universal Driver software page
DSCUD 8.4.0 Driver
DSCUD 8.4.0 Demos-OMM-DIO-XT
Datasheet

Onyx-MM-DIO Datasheet(.pdf, 93.3 KB)
Technical Documents

82C55 Digital I/O IC Datasheet(.pdf, 275.4 KB)
FEATURES
48 digital I/O lines
Programmable port directions
10KΩ pull-up resistors on each line
All lines power up in input mode
Dual 50-pin I/O headers
Low cost
Software and technical manual included
-40°C to +85°C extended temperature
ONLINE SUPPORT
See Onyx-MM-DIO Technical Resources
Request Product information
Request Technical Support
DOWNLOADS
Onyx-MM-DIO Manual v1.4
(.pdf, 337.5 kb)
Onyx-MM-DIO Datasheet
(.pdf, 93.3 kb)