| ??? 08/06/07 23:39 Read: times |
#142836 - Transmit and Receive Responding to: ???'s previous message |
Joseph Hebert said:
Pin 2 RxD (Receive Data)
Pin 3 TxD (Transmit Data) Pin 5 GND (System Ground) Note that the RS232 was specifically defined for interfacing with modems (or "DCEs" - Data Communication Equipments). The equipment connected to a DCE (modem) is called a DTE (Data-circuit Terminating Equipment). Therefore the RS232 specification actually defines TxD as, "data to be transmitted over the comms link" - which is an output from the DTE, but an input to the modem; Similarly, RxD is "data received from the comms link" - which is an output from the modem, but an input to the DTE. Anything that isn't a DCE (modem) should be a DTE - thus your PC and your 8051 should both be DTEs and, therefore, a so-called Null-modem cable should be needed to connect them. See: http://www.8052.com/forum/read.phtml?id=136479 |
| Topic | Author | Date |
| interfacing with serial port of the PC | 01/01/70 00:00 | |
| this is why we have FAQs here | 01/01/70 00:00 | |
| Three pins required | 01/01/70 00:00 | |
| are you sure that site is alive? | 01/01/70 00:00 | |
| well, slightly different | 01/01/70 00:00 | |
| Thanks Jan | 01/01/70 00:00 | |
| oh-er-that's all right it's a pleasure... | 01/01/70 00:00 | |
| Superman says | 01/01/70 00:00 | |
| English | 01/01/70 00:00 | |
Only French and German? | 01/01/70 00:00 | |
| Transmit and Receive | 01/01/70 00:00 | |
| I hate this nomenclature | 01/01/70 00:00 | |
| Googled CP3102... | 01/01/70 00:00 |