Summary of Contents for SCIDYNE DIO24
- Page 1 USER’S REFERENCE MANUAL DIO24 24 Bit Digital I/O Module for PC/104 Model No. 100-7543 Doc. No. M7543 Rev: 1.5 6/14/06 649 School Street / Pembroke, MA 02359 USA / Tel: (781) 293-3059 www.scidyne.com...
- Page 2 © Copyright 1997 - 2006 Buyer’s facility for products repaired CERTIFICATION: Testing and SCIDYNE or replaced. SCIDYNE may, at its other quality control techniques are “All Rights Reserved” discretion, bill the Buyer for return utilized to the extent SCIDYNE Previous revision: 1.4 1/28/05...
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Page 3: Table Of Contents
Table of Contents INTRODUCTION ............................1 MODULE SETUP ............................2 DIO24 Factory Default Configuration....................2 J4 Interrupt Input Channel ........................3 J5 Interrupt Edge........................... 3 J6 I/O Base Address..........................3 J7 Host Interrupt ........................... 3 HARDWARE INTERFACE ........................4 J3 Connector Pinout..........................4 I/O stage operation.......................... - Page 4 WARNING: Calls attention to a procedure, practice or condition that could possibly cause severe bodily injury, death or extensive equipment damage. Terminology Host This is the computer or similar device into which the DIO24 is plugged. Logic conditions Unless otherwise noted, logic signals are designated as TRUE (Set) and FALSE (Clear).
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Page 5: Introduction
The use of CMOS circuitry provides low power consumption as well as high noise immunity. External peripheral components attach to the DIO24 by means of a 50 conductor IDC type connector. The pinout of this connector is fully compatible with industry standard solid state relay racks. -
Page 6: Module Setup
MODULE SETUP Before the DIO24 can be put into service it must be properly configured for the desired operating modes. This is accomplished by placing shorting jumpers at various locations on the module. The component identification is shown in figure 2. Each DIO24 comes from the factory set to a basic functional default configuration. -
Page 7: J4 Interrupt Input Channel
This in turn transposes the function of jumpers J5-A and J5-B in relation to actual field wiring. J6 I/O Base Address The DIO24 occupies four consecutive bytes in the hosts I/O map. The default address of 0x300 can be changed to any four byte boundary in the range of 0x000 to 0x3fc (0 to 1020 ). -
Page 8: Hardware Interface
HARDWARE INTERFACE External devices attach to the DIO24 through J3, a 50 pin IDC type connector. The pinout for J3 is shown below. It is compatible with 8, 16 and 24 position solid state relay racks offered by various manufactures. The DIO24 is also intended to be used to interface switch contacts, relays, LEDs and any other common peripheral devices. -
Page 9: I/O Stage Operation
I/O stage operation Upon system reset the flip/flop’s output is cleared deactivating the DMOS transistor and placing it in a high impedance state. The I/O channel is pulled high by virtue of the 2k ohm resistor. Its value has been chosen to supply reasonable source current while the I/O stage functions as an output, yet be capable of being overridden by external devices when used as an input. -
Page 10: Interrupts
INTERRUPTS The DIO24 allows any single channel used as an input to optionally interrupt the host when that channel changes to a predetermined state. Interrupts are detected using a unique Level-Edge circuit. This feature allows external signals to interrupt the host while that signals remains in a predetermined state. -
Page 11: Interrupt Timing Sequence
The request invokes an interrupt service routine on the host. If interrupts are shared, the IS bit can be examined to determine if the DIO24 has caused the request. During the interrupt service routine the input is returned to its idle state by removing the source of the interrupt. -
Page 12: Specifications
SPECIFICATIONS Number of channels: 24 Individually programmable digital Input/Output channels, non-isolated. Input level: Logic 0 = 0.8vdc maximum, -0.6vdc minimum Logic 1 = 2.0vdc minimum, 5.6vdc maximum Output level: Logic 0 = < 0.4vdc (15ma load) Logic 1 = > 2.0vdc (1ma load) Max output current: Per channel Source:...
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