Appendix F
Serial Port Interface
This appendix provides information about the serial port interface for the Model XM128 ISDN Digital Modem.
RS-232 Serial Interface
Table
Table | Serial port interface |
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Pin number | EIA | Signal/pin description | Signal direction | ||
signal name | signal name | DTE | |||
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1 | 101 | AA | Protective ground (GND). | ¤ | |
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2 | 103 | BA | Transmitted data (TXD). | ? | |
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3 | 104 | BB | Received data (RXD). | ‹ | |
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4 | 105 | CA | Request to send (RTS). | ? | |
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5 | 106 | CB | Clear to send (CTS). | ‹ | |
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6 | 107 | CC | Data set ready (DSR). | ‹ | |
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7 | 102 | AB | Signal ground (GND). | ¤ | |
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8 | 109 | CF | Data carrier detected (DCD). | ‹ | |
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15 | 114 | DB | Transmit clock signal (source: DCE). | ‹ | |
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17 | 115 | DD | Synchronous receive clock. | ‹ | |
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18 | 141 |
| Local analog loopback test. | ? | |
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20 | 108/2108/1 | CD | Data terminal ready (DTR). | ? | |
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| Connect DCE to line. |
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21 | 140 |
| Remote digital loop test. | ? | |
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Serial Port Interface |
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