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Data Aquistion & Control
RS232 | RS485 Serial Link

IO485 Acquisition and control system

The I/O485 line of boards is a data acquisition and control system that can connect a computer to 32 remote stations using a single cable in a multidrop configuration. The full duplex link is also widely known as a "4 wire link"

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The I/O485 line of boards is a data acquisition and control system that can connect a computer to 32 remote stations using a single cable in a multidrop configuration. The full duplex link is also widely known as a "4 wire link" (which in actuality requires 5 wires since all the signals are referenced to ground).

An optional additional line is used, in our system, to carry power.. The I/O485 provides a low cost multidrop solution to a wide range process control problems. The I/O-485 boards can be connected to the computer using our RS232-RS485 converter or a third party RS232/RS485 converter.

Controlling the I/O485 is equally simple and requires no on-chip programming. All functions can be called by means of simple ASCII commands. Popular programs such as PROCOMM® or Windows Terminal® can be used to execute controls or debug complex functions before writing the final application software.


Features:
Multidrop link
32 station RS485 multi-drop link via 5 or 6 wire connections.
Easy connection to computer's serial
Inexpensive RS232/RS485 converter allows for easy connection to the computer's serial port. (Available as a separate item.)
Reach of link
Link can be up to 4000' or 1200m long. For longer distances, a digital repeater can be used.
Station independence
Each station is optically isolated to 2500 volts.
Three powering modes supported
Two individual power supplies to each station. Full optoisolation.
One external power supply per station via the computer link. Full optoisolation.
Power provided via the computer link only.
Broadcasting capability
Triple mode broadcasting capability.
Optoisolation circuit voltage
2500 volts optoisolation circuit.
Assistance
On-line Help command.
Available lines
32 TTL compatible lines per station (42 if there is only one station in the network) independently configurable as inputs or outputs.
Ease of connection to lines
Phone jacks (RJ11/12) and terminal strip pads on board for easy hook up to a variety of link wire sizes.
Line protection
All power lines are reverse polarity protected by diodes in series.
PWM
Two independent 10-10,000 Hz, 0-100% duty cycle Pulse Width Modulation channels.
Interrupt lines
High and Low interrupt lines (edge sensitive) available when the station is active.
Baud rate
Baud rate configurable, via software, from 300 baud up to 115200 baud.
Resistance, conductance & capacitance reading
Eight channels for reading relative resistance, fluid conductance or capacitance.
Stepper motors
Four stepper motor ports with all the necessary logic embedded to facilitate monophasic, biphasic and half-step modes.
Repeat ease
Single "Again" command allows repeat of previous command at a fast rate.
Easy access to active configuration
A configurable status feature which sends the active configuration of any parallel port, stepper motor port, or the PWM back to the terminal.
Analog-to-digital channels
Eleven channel analog-to-digital converter with either 8, 10 or 12 bit resolution is available.
Hardware & software
Associated hardware and software development is easy and cost effective.
Ease of access to functions
All functions can be called by means of simple ASCII commands.
Low cost per station due to
Intrinsic low cost of the units.
No need for "on-board" programming thus allowing for very low costs associated with software development.
The set of functions embedded in the ITC232-A IC drastically reduces associated hardware. As an example, an excellent precision liquid level measurement system based on conductivity can be implemented with the addition of only two 4066 IC's, an inverter (4069 )or transistor and a capacitor. The use of the ITC232-A also brings in the well known simplicity advantage this chip offers.


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