| ??? 08/30/11 06:02 Read: times |
#183533 - re: 1 byte - MDB Responding to: ???'s previous message |
Yes, I think that the vending machine MDB protocol is unusual in using the 9th bit to also mark the endof a message
See: http://www.8052.com/forum/read/183512 Amd: http://www.vending.org/technolog...sion_4.pdf Michael Karas said:
... as Per has said a receiving entity could sync on that other byte as the start of a packet. Note that MDB sets the 9th bit at the end of a Slave (response) message only - it does not set it at the end of a Master (command) message. Thus there can be no confusion as to whether it signifies the start or end of an MDB message. |
| Topic | Author | Date |
| Multiprocessor Communication 8052 | 01/01/70 00:00 | |
| where is bottleneck? | 01/01/70 00:00 | |
| That's the usual approach | 01/01/70 00:00 | |
| one comment | 01/01/70 00:00 | |
| 9th Bit - How ? | 01/01/70 00:00 | |
| how to use bit 9 for data bytes? | 01/01/70 00:00 | |
| one form of 9th bit use | 01/01/70 00:00 | |
| One byte | 01/01/70 00:00 | |
| One Byte !!! | 01/01/70 00:00 | |
| re: 1 byte - MDB | 01/01/70 00:00 | |
| Strong work | 01/01/70 00:00 | |
| Just as there is a timeout | 01/01/70 00:00 | |
| my reason | 01/01/70 00:00 | |
Protocol should preferably support dry-counting for EOP pos | 01/01/70 00:00 | |
| Methods in brief | 01/01/70 00:00 | |
| At least 1 packet less (sic) | 01/01/70 00:00 | |
| Neither! | 01/01/70 00:00 |