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INFORMATION

ADC-808 ANALOG INPUT BOARD

Delivery available - WORLDWIDE! Click here for pricelist.
A starter pack is now available for this board!

FEATURES

  • Eight bit resolution
  • Eight user configurable inputs
  • 500 Volt rms isolation option available
  • Screw terminals accept 2.5mm wire
  • LEDs indicate power & control status
  • Powered from 5VDC, 12VDC or 9VAC
  • Watch-dog timer incorporated
APPLICATIONS

  • Data acquisition
  • Home automation
  • Quality Control testing
  • Automation and control
  • Energy monitoring & management

GENERAL DESCRIPTION

The ADC-808 board (240mm x 100mm) has been designed for applications where reliable operation in the most arduous conditions is required. These boards are mounted externally and are capable of operating through any IBM-PC bi-directional parallel Printer Adapter interface (many PCs, notebooks and industrial PC/104 computers have compatible interfaces). The use of the PC-BD-IO interface card is recommended for guaranteed operation and full expansion capability. Four DIP switches select each board’s address setting on the PA-BUS allowing up to fifteen cards to be daisy-chained using a single 25 way cable and provides up to 120 analogue inputs. Or using other boards available in the range, combinations of analogue and digital inputs and relay outputs can provide up to 240 I/O. These boards are also capable of being controlled by a suitable microcomputer system such as the ABC (AVR Basic Controller). The ABC also allows you to control the boards through the serial port!

The PA-BUS interface to the computer uses the latest ALS logic devices for low power consumption, improved drive capability (PA-BUS cable lengths to 30 metres are possible) and increased protection against electrostatic discharge which conforms to the MIL-M-38510 spec. The PA-BUS interface also allows the board to be powered up and down whilst the bus is operating.

The on-board 8 bit analogue to digital converter (ADC) has a total error of +/- 1 bit and a maximum sampling rate of 50,000 samples per second (25,000 samples guaranteed over the full temperature range). Each analogue input has user configurable circuitry although the board may be purchased with 0-10 Volt or 0-20 mA inputs as standard. Other options include; temperature inputs (using low-cost semiconductor devices) capable of measuring 2 to 100°C with a resolution of 0.5°C. Or higher resolution of 0.25°C over 0 to 60°C.

Each board provides status or ID information to the computer, allowing the system configuration to be determined and checked. Fail-safe functioning has been designed into the board with a watch-dog timer providing shutdown if a computer read or write operation has not been performed within 0.15 or 1.5 seconds (jumper selectable). This function may be turned off it not required. Power fail indication is also provided allowing the computer to take necessary corrective action if a power loss occurs on any board connected to the system.

An special version, ADC808/S, is available with 500 Volt isolation between each analogue input , detachable screw terminals for easy installation and extended supply voltage range. Other options are available to customer order.

Other boards in the range are; G6C-24VAC a 8 relay output and 8 input board and the PC-IO-G6C2 sixteen relay output board.

If you are interested in a single analogue input, or simply a great Digital Multimeter at a great price see our Datalogging Multimeters. Single channel data logging or data acquisition for around $90!

CUSTOMER QUOTES

'I am a very happy customer. I’ve been using the 16 relay boards I purchased, for the last few years, in my Christmas lights display. I managed to get them working with a program written in Delphi. Now it is time to expand...' Michael Hains, Australia.

"One of many of your boards, used in access control, allows 500 cars each day to enter and exit our basement carpark. We have never had a problem with your boards". Alan Wright, Technical Manager, Rialto Building, Australia.

'Hi, Peter. Yes, I'm still playing with my robots. I have eight of your G6C-24VAC cards and I've never had a problem with them - some are ten years old!' David Gerke, Australia.

"I have boards that have been switching once per second for over ten years ... thanks for a great product! Graeme Duncan, Australia. Note, Graeme was one of our first customers and purchased the PC-IO-NR board which uses relays with a mechanical life of 1000 million operations. Hopefully he'll get another 20 years out of it! p.s. We can still supply these relays on our 16 out board ... however, solid-state relays would be recommended.

"We had problems with everything else during development, but not with your boards." Malcolm Murray, Director, Locker Systems of Australia.

"Your boards have proved to be most reliable. If I could buy all my products from you, I'd be laughing!" Bruno Cali, Locker Systems of Australia. (note, over 1000 custom-made boards, since 1996, have been purchased by L.S.A.)

Note, our quality record is almost unblemished; only one of the 2000+ boards shipped to date have been returned due to faulty parts or workmanship! We only use quality Omron relays and good-quality screw terminal connectors!

PROGRAMMING

A range of programming options are available. The advanced ADC software provides numerous programs to help get your application up-and-running fast! High speed routines are provided that allow control of a system with 120 analogue inputs from most languages. Example programs are provided for: QBASIC, VisualBASIC for Windows, C, Pascal. Example programs in Delphi and VisualC++ are also available. The control software has now been tested with Windows NT, 2000 and XP.

Should you wish to program the board directly, the following program illustrates how easy it is. This program is written in QBASIC and assumes that a PA-BUS card is installed at the port address of 768 (300 hex) and that the ADC board is set to address 1 (both default values). The one analogue input from channel 0 is read and stored in variable A0.

DEFINT A-Z ‘Integer variables
CONST PORT = 768! ‘PA-BUS address

CHANNEL = 0 ‘Select channel 0 to 7

OUT PORT, CHANNEL + 16 XOR 255 ‘Output channel
OUT PORT + 2, 1 ‘Select output
OUT PORT + 2, 1 ‘Again for delay*
OUT PORT + 2, 0 ‘Latch data

OUT PORT + 2, 5 ‘Select input board
OUT PORT + 2, 5 ‘Again for delay*
A0 = INP(PORT) ‘Get input

*A 5 microsecond delay is required, on high speed computers add more OUT instructions!

Using the subroutines provided on the ADC software diskette, complex logic control routines can be programmed and combined with data acquisition functions. An example of analogue input, in BASIC, follows:

Value = AdcIn(Address, Channel)

A value between 0 and 255 is returned from ADC board Address (1 to 15) and Channel (0 to 7).

WARRANTY

All products manufactured by Procon Technology are warranted against defective materials and workmanship for a period of 2 years from the date of purchase. Any product that is found to be defective within the warranty period will, at the option of Procon Technology, be repaired or replaced.

ORDERING INFORMATION

ADC-START is the starter package consisting of 1 x ADC-808 board, 1m connecting cable, software diskette with programming examples in most languages.

ADC808 complete board with inputs configured for 0-10V or 0-20mA (please specify).

ADC808T complete board with inputs configured for 0-1.28V temperature sensors (LM35).

ADC808/S special industrial version with isolated inputs and detachable screw terminals.

Click here for technical data.