162Signal Input/OutputExternaldevice[ 3 ] Interface SpecificationsRS-232C Interface Port (Dsub-25S) on the CU-700025131411 FG Frame ground —2 SD Send data →3 RD Receive data ←4 RS Request to send —5 CS Ready to send —6 DR Data set ready —7 SG Signal ground —8 CD Carrier detect —20 ER Data terminal equipment ready —CU-7000Pin No. Signal FunctionsShown below is a diagram of the internal connection in the CU-7000.2782065431SDSGCDERDRCSRSRDFG Not used.RS-232CInterfaceCircuitryOpticalCommunicationsInterfaceCircuitryBHTOptical InterfaceCU-7000SignalName Pin No.Host computer,modem, orother devices
