Remote Access 24-bit Digital I/O Card

ACCES I/O Official Distributor
ACCES I/O Official Distributor
Model No:
RDG-24
Highlights:
  • Brand: Acces IO
  • Opto-Isolated RS-485 Serial Interface to Host Computer
  • All Programming in Software, No Switches to Set.
  • Change of State Flag Readable via the Serial Port
QTY:
Downloads:
Overview

Model RDG-24 is an intelligent, 24-bit parallel digital-I/O-to-computer interface unit. RDG-24 is enclosed in a steel enclosure for use in hostile environments. There are no switches or jumpers to set to enable half-duplex operation. In RDG-24 there are jumpers to bypass the opto-isolators if you wish, plus there are jumpers to set full-duplex operation if you desire. Digital Inputs may be read individually, in 8-bit bytes, or in 24-bit words at voltages up to 50 VDC. There are also digital software counters on each input. Selectable edges can be counted for up to 65,535 transitions. These counters support Read and Reset commands. Moreover, change-of-state flags can be set on any enabled input bits and can be read via the serial port. This is particularly useful in applications where it is necessary to detect contact closures or openings. This change-of-state detection capability is enabled on a bit-by-bit basis for all bits that are programmed to be inputs. Digital-input sample rate is software programmable from 14 Hz to 1 KHz. Digital Outputs may be programmed individually, in 8-bit bytes, or in 24-bit words. These outputs may be latched, pulsed, or set to free run at a programmed rate. The digital output drivers are open-collector circuits that have 350 mA drive capability at a logic "low". RDG-24 outputs can comply with up to 50 VDC (voltage supplied by you) or, if no external voltage is available, outputs will be pulled up by an internal 10 Kilohm resistor to 5 VDC. The digital-output square wave pulse rate is software programmable from 7 Hz to 500 Hz. A built-in watchdog timer resets the pod if, for some unexpected reason the microcontroller "hangs up" or if the power supply voltage drops below 4.75 VDC. Also, data collected by the pod are stored in local RAM for later access through the computer's serial port. This feature facilitates a stand-alone mode of operation. For example, a portable or laptop computer that has an RS-485 port can be brought to the pod, connected, and collect the data.

Main Features
  • Remote Intelligent Digital I/O
  • Opto-Isolated RS-485 Serial Interface to Host Computer
  • 24-Bit Digital I/O Programmable Bit-by-Bit, in 8-Bit Bytes, or in 24-Bit Words
  • Digital Input and Output Voltages up to 50VDC
  • Open Collector Digital Outputs for Loads up to 350mA
  • Protective Steel Enclosure
  • Type 8031 Microcontroller with 8K x 8 RAM and 8K x 8 EEPROM (32K x 8 optional)
  • All Programming in Software, No Switches to Set. Jumper to Set 2-Wire or 4-Wire modes, and Jumpers (3) to By-Pass Opto-Isolators if Desired.
  • 16-Bit Digital-Input Software Counters
  • Change of State Flag Readable via the Serial Port
  • Digital Outputs May Be Either Level or Pulse.
Ordering Info
  • RDG-24
  • WM-RDG-24
  • U-RDG-24
  • S-RDG-24
  • E-RDG-24
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