| ??? 05/11/05 17:53 Read: times |
#93320 - How do you know? Responding to: ???'s previous message |
Ahmed Abu Aqlain said:
I read all the messages in this domain, but the main problem is that I send the At command to the modem using the AT89c51, and take care of all problems and notes in the hardware in software, vut the modem did not response to the commands.
so if any one know any thing about how to intilize the external modem to 89c51 send it me please as soon as possible. thanks for all members But how do you know you are actually sending the command properly? And how do you know no response is being received? That's the idea behind the protocol analyzer: actually being able to observe bytes on the wire. If you haven't tried this or a similar solution (even putting the data on a scope will do), you really owe it to yourself to look into this. It wouldn't be the first time I've found myself not sending what I thought I was sending over the serial port. --Sasha Jevtic |
