1. Will the future system use existing protocol? (If new purchase, do not use proprietary protocol! You will reduce your options for integrating future equipment. If possible, use the Modbus protocol.)
2. Is there complete documentation?
3. What existing equipment do you need to connect to?
4. Do you need a multi-vendor software application to communicate with a variety of manufacturer's equipment?
5. Consider the security issues: What type of protection/safeguards will be needed and used to keep out hacking, tampering, sabotage and other unauthorized use.
(Master Control Station)
1. Do you need the master station to control local input/output and back up operations?
2. How many sites and stations does your application require?
3. Will the remote station collect data independent from the master station?
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