| ??? 11/21/08 22:59 Read: times |
#160185 - Short pins 2 & 3 on PC Comport Responding to: ???'s previous message |
Short the Tx and RX pins (pins 2 & 3) on the DB9, or DB25 commport on the PC, then in your terminal application, press any printable key (not tab, space or enter) and you should be able to see what you type echoed on the screen.
The data will be "looped back" from the TX out of the commport and back onto the RX in of the same commport. This will tell you with some degree of certainty that data is falling out the back of your PC. Regards Marshall |
| Topic | Author | Date |
| How to test a comport ? | 01/01/70 00:00 | |
| Scope is good. | 01/01/70 00:00 | |
| connect it | 01/01/70 00:00 | |
| Short pins 2 & 3 on PC Comport | 01/01/70 00:00 | |
| that's only half the "test" | 01/01/70 00:00 | |
| Maybe a third? | 01/01/70 00:00 | |
| you don't have to use them | 01/01/70 00:00 | |
| But that may require you to specifically turn them off | 01/01/70 00:00 | |
| Goodness! That must be difficult. | 01/01/70 00:00 | |
| No, it's not difficult | 01/01/70 00:00 | |
| Run Hyperterminal with flow control off | 01/01/70 00:00 | |
| I'm late.......... | 01/01/70 00:00 | |
| Hyperterminal bundled with Windows | 01/01/70 00:00 | |
| do the LOOPBACK TEST | 01/01/70 00:00 | |
LOOP BACK | 01/01/70 00:00 |