| ??? 08/04/11 11:24 Read: times |
#183195 - yes,i think Responding to: ???'s previous message |
I use SP232 (MAX232) with internal 5k ohm resistors on RS232 side. So, is it a right way to put 2k ohm resistor on the other side of the cable into the Canon9 connector? yes, i think. Input impedance will be > 1k, which is needed by RS232 standard. In my opinion, one-side disconnected RS232 cable can work as an antenna. So adding a resistor on the other side of the cable can make it less noise sensitive. Is it true?
yes , i think , but ask Yourself - what signals catches that 'antenna'? i think it is more likely cross-talk between RX and TX wires . So better cable is recommended too. or just disconnect cable from converter, not only from PC. regards |
| Topic | Author | Date |
| Problem with RS232/RS485 converter... | 01/01/70 00:00 | |
| More info please | 01/01/70 00:00 | |
| probably | 01/01/70 00:00 | |
| more info... | 01/01/70 00:00 | |
| yes,i think | 01/01/70 00:00 | |
| input impedance | 01/01/70 00:00 | |
| i'm wrong | 01/01/70 00:00 | |
| what is the right value? | 01/01/70 00:00 | |
| did You tryed capacitor? | 01/01/70 00:00 | |
| thanks... | 01/01/70 00:00 | |
| it works...! | 01/01/70 00:00 | |
| congrats | 01/01/70 00:00 | |
| shape | 01/01/70 00:00 | |
| dont | 01/01/70 00:00 | |
| It is OK. | 01/01/70 00:00 | |
| Hints... | 01/01/70 00:00 | |
| schema | 01/01/70 00:00 | |
| Repair... | 01/01/70 00:00 | |
| transils... | 01/01/70 00:00 | |
| RS485 | 01/01/70 00:00 | |
| Sample Schematic | 01/01/70 00:00 | |
| Thank you very much for the schema... | 01/01/70 00:00 | |
| AVX varistors... | 01/01/70 00:00 | |
| capacitor | 01/01/70 00:00 | |
| capacitors... | 01/01/70 00:00 | |
| GNDs | 01/01/70 00:00 | |
| 1992 | 01/01/70 00:00 | |
| Thanks... | 01/01/70 00:00 | |
Links... | 01/01/70 00:00 |