| ??? 10/19/08 14:07 Read: times |
#159207 - exactly what is connected to the MAX232... Responding to: ???'s previous message |
... and how? You mention a battery-powered device, which would indicate, that the MAX232-side gets never connected to anything earthed, correct?
What sort of connector are you using on the '232 side, and what is its pinout? Couldn't this be by mistake connected to some other device, e.g. a PC? The MAX232 I have seen failed were invariably subject to some severe abuse, e.g. lightning nearby etc. Once one my colleague while fiddling around a mains-powered prototype, pulled inadvertently a 230V live wire out of a loose screw terminal and it touched a serial line. The level shifter in PC (75232 or alike) simply blasted off the PC, leaving only its legs behind... ;-) JW PS. What's the state of the SECOND receiver in a failed circuit? PS2. I assume you made absolutely sure that the failure is in the MAX232 and not the circuitry connected to RxOut...? |
| Topic | Author | Date |
| MAX232 failure | 01/01/70 00:00 | |
| MAX232 failure | 01/01/70 00:00 | |
| Does that mean, ... | 01/01/70 00:00 | |
| Yes, ground is not connected | 01/01/70 00:00 | |
| exactly what is connected to the MAX232... | 01/01/70 00:00 | |
| But it truly should... | 01/01/70 00:00 | |
| Thanks for your suggestion | 01/01/70 00:00 | |
485/232 with 'unreliable' ground | 01/01/70 00:00 | |
| It is a handheld terminal | 01/01/70 00:00 |