Interface Signals
Functional descriptions of the
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Number | Signal Name | Function |
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1 | Shield Ground | Enables tandem sections of shielded cable to retain |
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| continuity through the connector. |
19 | Signal Ground | Directly connects the DTE circuit ground to the DCE |
| (SG) | circuit ground, providing a path for DTE and DCE |
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| signal commons. |
4/22 | Transmit Data | Used by the DTE to pass binary data to the DCE for |
| (TxD) | transmission over the communications channel. |
6/24 | Receive Data | Used by the DCE to pass binary data received from the |
| (RxD) | communications channel to the DTE. |
5/23 | Transmit Clock in | Enables the DCE to transmit signal element timing to |
| (TxCI) | the DTE. This enables the DTE Transmit Data signal on |
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| circuit TxD to be in synchronization with On/Off |
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| transitions on this lead. |
8/26 | Receive Clock | Transitions on this lead enables the DTE to time data |
| (RxC) | received over circuit RxD. |
17/35 | Transmit Clock | Enables the DTE to provide transmit timing |
| (TxC) | information to the DCE so that the DTE can |
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| synchronize with data arriving over the TxD lead. |
7/25 | Request to Send | Used by the DTE to advise the DCE it is ready to |
| (RTS) | transmit data. |
9/27 | Clear to Send | Used by the DCE to advise the DTE that the DCE is |
| (CTS) | ready to send data over the communications channel. |
11/29 | Data Set Ready | Used to advise the DTE of the Ready status on the |
| (DSR) | DCE. In most cases, this signal simply implies the unit |
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| is powered on. |
12/30 | Data Terminal | Used by the DTE to advise the DCE it is ready to |
| Ready (DTR) | transmit or receive. |
13/31 | Data Carrier Detect | The DCE uses this lead to advise the DTE that an |
| (DCD) | incoming signal on the communications channel is |
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| present. When first initialized this signal is an |
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| indication to the DTE to expect data momentarily. |
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