Difference between revisions of "CableCreation CD0486 USB to Female RS-232 Adapter"
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== Overview == | == Overview == | ||
| − | USB to RS-232 with female DE9 plug (male jackscrews) | + | USB to RS-232 with female DE9 plug (male jackscrews) and a <i>mostly</i> DCE pinout, not normally found on a PC that would typically have a male DE9 DTE pinout. When DCE is needed though, this adapter would make a null modem (crossover) cable unnecessary. If needed a DTE pinout though, you would have to go back to using a null model cable... |
== Wiring == | == Wiring == | ||
| − | This USB to RS-232 is configured as a DCE <i>not</i> a DTE, it is expecting to communicate with a DTE. | + | This USB to RS-232 is mostly configured as a DCE <i>not</i> a DTE, it is expecting to communicate with a DTE. <i>Mostly</i> because pins 1 and 9 have the wrong direction, they are not outputs, whether or not they are actually inputs needs to be verified... |
{| class="wikitable" | {| class="wikitable" | ||
| Line 15: | Line 15: | ||
! Function | ! Function | ||
! Direction | ! Direction | ||
| + | ! Note | ||
|- | |- | ||
| 1 | | 1 | ||
| DCD | | DCD | ||
| PC ← device | | PC ← device | ||
| + | | supposed to be an output for DCE? | ||
|- | |- | ||
| 2 | | 2 | ||
| − | | | + | | RXD |
| PC → device | | PC → device | ||
| + | | | ||
|- | |- | ||
| 3 | | 3 | ||
| − | | | + | | TXD |
| PC ← device | | PC ← device | ||
| + | | | ||
|- | |- | ||
| 4 | | 4 | ||
| DTR | | DTR | ||
| − | | PC & | + | | PC ← device |
| + | | | ||
|- | |- | ||
| 5 | | 5 | ||
| GND | | GND | ||
| PC ↔ device | | PC ↔ device | ||
| + | | | ||
|- | |- | ||
| 6 | | 6 | ||
| DSR | | DSR | ||
| − | | PC & | + | | PC → device |
| + | | | ||
|- | |- | ||
| 7 | | 7 | ||
| RTS | | RTS | ||
| − | | PC & | + | | PC ← device |
| + | | | ||
|- | |- | ||
| 8 | | 8 | ||
| CTS | | CTS | ||
| − | | PC & | + | | PC → device |
| + | | | ||
|- | |- | ||
| 9 | | 9 | ||
| RI | | RI | ||
| PC ← device | | PC ← device | ||
| + | | supposed to be an output for DCE? | ||
|- | |- | ||
| (shield) | | (shield) | ||
| shield | | shield | ||
| PC ↔ device | | PC ↔ device | ||
| + | | | ||
|} | |} | ||
Latest revision as of 07:44, 12 February 2024
Overview
USB to RS-232 with female DE9 plug (male jackscrews) and a mostly DCE pinout, not normally found on a PC that would typically have a male DE9 DTE pinout. When DCE is needed though, this adapter would make a null modem (crossover) cable unnecessary. If needed a DTE pinout though, you would have to go back to using a null model cable...
Wiring
This USB to RS-232 is mostly configured as a DCE not a DTE, it is expecting to communicate with a DTE. Mostly because pins 1 and 9 have the wrong direction, they are not outputs, whether or not they are actually inputs needs to be verified...
| DE9 Pin | Function | Direction | Note |
|---|---|---|---|
| 1 | DCD | PC ← device | supposed to be an output for DCE? |
| 2 | RXD | PC → device | |
| 3 | TXD | PC ← device | |
| 4 | DTR | PC ← device | |
| 5 | GND | PC ↔ device | |
| 6 | DSR | PC → device | |
| 7 | RTS | PC ← device | |
| 8 | CTS | PC → device | |
| 9 | RI | PC ← device | supposed to be an output for DCE? |
| (shield) | shield | PC ↔ device |
For more pin function information, see these Wikipedia pages:
Serial port - Wikipedia (Pinouts section)