| ??? 04/05/12 19:13 Read: times |
#187016 - Modbus Responding to: ???'s previous message |
Modubus seems to answer most of your requirements. See
www.modbus.org Being a master/slave working in 1/2 duplex, you can of course save a pair of wires. Murray R. Van Luyn said:
The master may also need to ask certain slaves to operate outputs under their control, and have them report back when successfully done. I don't know how you can do this in a master/slave operation, other than the master interrogating the status. How would the slave initiate a response? Murray R. Van Luyn said:
Each of the slaves may end up with it's own serialised 16-bit node address, and the master will have to learn about the slave population through an initialisation-time address scanning procedure. Typically the Modbus modules that I have used power up at a default address and the Modbus master can then configure it to a new address. Murray R. Van Luyn said:
Disaster, they're making me code for PICs!!! I sympathise. However, if I remember correctly, there is quite a bit of sample code for Modbus on the PIC. -Aubrey |
| Topic | Author | Date |
| Data Link Layer for RS485? | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
| Yep, Modbus Fits The Bill. | 01/01/70 00:00 | |
| Changing the Modbus Address | 01/01/70 00:00 | |
You've been busy. | 01/01/70 00:00 |