Allows a QT608CD1S large corridor display to be connected to a Quantec-Pro call system via an RS232 serial interface lead (supplied with the large display). Mounts on a standard UK 20mm double gang flush or surface back box. The data connection to the large display is monitored. If this is disconnected or the large display is switched off then the QT615S appears as “Missing” on the Quantec controller
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