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E. Connectors, Cables, and Pin Assignments
9700-A2-GB20-20 December 2002 E-5
Model 9783 COM Port Connector
Table E-2, Model 9783 COM Port Connector, provides the pin assignments for the
FrameSaver Model 9783 CSU/DSU’s and router’s 25-position EIA-232-E
communication port connector.
Model 9720 and 9788 COM Port Connector
Table E-3, Model 9720 and 9788 COM Port Connector, provides the pin
assignments for the FrameSaver Model 9788 CSU/DSU’s and router’s 9-position
EIA-232-E communication port connector.
Table E-3. Model 9720 and 9788 COM Port Connector
Table E-2. Model 9783 COM Port Connector
Pin # Signal Direction
1 Shield (GND) —
2 DCE Transmit Data (TXD) From DTE (In)
3 DCE Receive Data (RXD) To DTE (Out)
4 DCE Request To Send (RTS) From DTE (In)
5 * DCE Clear To Send (CTS) To DTE (Out)
6 * DCE Data Set Ready (DSR) To DTE (Out)
7 Signal Ground (GND) —
8 * DCE Carrier Detect (CD) To DTE (Out)
9–19 Unused —
20 DCE Data Terminal Ready (DTR) From DTE (In)
21–25 Unused —
*Pins 5, 6, and 8 are tied together.
Pin # Signal Direction
1* Data Carrier Detect (DCD) To DTE (Out)
2 Receive Data (RD) To DTE (Out)
3 Transmit Data (TD) From DTE (In)
4 Data Terminal Ready (DTR) From DTE (In)
5 Signal Ground (GND) —
6* Data Set Ready (DSR) To DTE (Out)
7 Not used —
8* Clear To Send (CTS) To DTE (Out)
9 Not used —
*Pins 1, 6, and 8 are tied together.