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i'm working on a project in ICA (instrumentation control automation). i have this temperature controller (TC) and want to connect it to pc using hyperterminal. the problem is, this temperature controller is outdated and has 5 pin (AT) recorder. i want to connect to pc by serial port but there is no communication between TC and PC. how can i communicate with these 2 things before i start making a program for it? this TC also has a temperature probe and heater.