| ??? 03/01/05 23:07 Read: times |
#88820 - Tx control Responding to: ???'s previous message |
For Rs-485 there need be a pin that states whether the chip transmit or not (not = ready to recieve). The 485 bus is unidirectional.
For each and every product I have made there is a little connector to attach a MAX232 sitting next to the 75176 and that is a pain in the G M since that requires opening of the box. I can appreciate that making a pin wiggle during ISP may not suit all designs very well and thus I suggested that you had a command "set direction pin" with a bitmask for the pin to be used for direction. That way, if no such command were issued (by FlashMagic, Andy has promised support if I can get the feature) the ISP would not be affected and backwards compatibility would be 100%. I can't but wonder why all serial ISP chips do not have this, 485 is more widespread than 232 in industrial/professional designs. Erik |
| Topic | Author | Date |
| service connector | 01/01/70 00:00 | |
| Nope | 01/01/70 00:00 | |
| Service Connector | 01/01/70 00:00 | |
| Service Connector | 01/01/70 00:00 | |
| Outsourcing??? | 01/01/70 00:00 | |
| connector | 01/01/70 00:00 | |
| connector | 01/01/70 00:00 | |
| DB15 | 01/01/70 00:00 | |
| Use It! | 01/01/70 00:00 | |
| NOO! | 01/01/70 00:00 | |
| Idiot proof | 01/01/70 00:00 | |
| Murphys law | 01/01/70 00:00 | |
| If power leads , then protect. | 01/01/70 00:00 | |
| power output protection | 01/01/70 00:00 | |
| Special connector. | 01/01/70 00:00 | |
| consider this | 01/01/70 00:00 | |
| LTC 1785 | 01/01/70 00:00 | |
| flip 485/422 | 01/01/70 00:00 | |
| half duplex serial ISP | 01/01/70 00:00 | |
| news to me | 01/01/70 00:00 | |
| I am confused... | 01/01/70 00:00 | |
| begging does not equal having | 01/01/70 00:00 | |
| DIY :-) | 01/01/70 00:00 | |
| if you did not follow the rules | 01/01/70 00:00 | |
| you never begged ME ! | 01/01/70 00:00 | |
| Tx control | 01/01/70 00:00 | |
| Byte-by-byte 485 | 01/01/70 00:00 | |
| have you tried my patch? | 01/01/70 00:00 | |
| to ME | 01/01/70 00:00 | |
| summing up | 01/01/70 00:00 | |
| "fed through a power resistor" ??? | 01/01/70 00:00 | |
| PSU protection | 01/01/70 00:00 | |
| Polyswitch price | 01/01/70 00:00 | |
| Polyswitch II | 01/01/70 00:00 | |
| not to mention | 01/01/70 00:00 | |
| service connector mk. - now with JTAG? | 01/01/70 00:00 | |
| I would not do it. | 01/01/70 00:00 | |
| no JTAG on the service connector | 01/01/70 00:00 | |
Please Contact | 01/01/70 00:00 |