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Special PAIRING for duplex (two-way) way) systemsThe display configuration is memorised in the CU.The pairing procedure for duplex systems requires that after the PCU hasbeen switched off (as with normal pairing), it must be switched back on for asecond pairing phase.In the second phase of pairing, the following are transferred from the CU to thePCU: the ICONS, FONTS, TEXTS, FRAMES to contain the numbers andtexts.During this phase, the display inside the CU continues to revolve e and thedisplay shows the following messages:A transfer is only carried out if necessary.1724/06/2011