We work with wireless Scada 5 year and our opinion : best solution is Moscad from Motorola ( www.motorola.com). If you want SCADA over GSM you can find example and solution on www.klinkmann.com
Be careful - SCADA over radio very special.
Best regards,
Grigory Ter-Akopov.
Vega Company,Ukraine
I no agree with the Motorolo products, the solution is hardware and software propietary. Try wireless radios from CISCO (Building-to-building) in 2 and 5GHz. We also use the Data-Linc radio in 920KHz in SCADA systems. We have many electrical substations runnning with this technology and some pole control (reclosers) in elect. distribution nets. (www.data-linc.com)
Good luck!
Carlos Araya Mackenney
Automation Manager - PLC International S.A.
Phone (562) 269.8727 Fax (562) 269.8728
Santiago de Chile