Null Modem Cable Architecture
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8/27/2008
The following table shows the required hardware for a serial port connection.
| Requirement | Description |
|---|---|
Null modem cable |
A type of serial cable used for obtaining standard debug messages. |
The following table shows the pin settings for a 9-pin null modem cable.
| Data Terminal Equipment (DTE) | Data Communications Equipment (DCE) | Label |
|---|---|---|
1, 6 |
4 |
CD, DSR - DTR |
2 |
3 |
RD - TD |
3 |
2 |
TD - RD |
4 |
1, 6 |
DTR - CD, DSR |
5 |
5 |
Gnd - Gnd |
7 |
8 |
RTS - CTS |
8 |
7 |
CTS - RTS |
Note
9 is NC on both ends.
The following table shows the pin settings for a 25-pin null modem cable. RTS and CTS are crossed to support hardware flow.
| DTE | DCE | Label |
|---|---|---|
2 |
3 |
TD - RD |
3 |
2 |
RD - TD |
4 |
5 |
RTS - CTS |
5 |
4 |
CTS - RTS |
6, 8 |
20 |
DSR, DCD - DTR |
7 |
7 |
Gnd - Gnd |
20 |
6, 8 |
DTR - DSR, DCD |
See Also
Tasks
How to Configure and Download a Run-Time Image to a CEPC