1645.6 RS-232C Interface Specifications[ 1 ] Interface Connector and Pin AssignmentThe CU-7000 has an RS-232C interface port (Dsub-25S).RS-232C interface port (Dsub-25S) on the CU-7000Pin No. Signal Functions Signal Input/OutputCU-7000 External device1 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 —The input/output voltage threshold for the logical valued signal is listed below.Logical Value Input Voltage Threshold Output Voltage Threshold0 3V min. 5V min.1 -3V max. -5V max.2513141
