Command State Options
For synchronous data communication, there are two options you can choose from to define how the modem will operate in the command state.
SYNC | AT&M1 | The modem accepts asynchronous |
DATA |
| commands in command state, but |
|
| exchanges data synchronously in data |
|
| state. |
SYNC | AT&M3 | The modem accepts synchronous |
|
| command (V.25bis) and exchanges |
|
| data synchronously with a remote |
|
| modem. |
Dialing from Synchronous Mode
1.Dial from the terminal using asynchronous commands: Set &M1 and use asynchronous AT commands to dial the number. Once the modem is connected, the modem will enter synchronous operation.
2.Dial through the computer using V.25bis commands: Some communication software packages on synchronous computers can dial using V.25bis synchronous commands. In this case, set &M3 and *I1 and the modem will accept V.25bis commands and make a synchronous connection.
3.Using DTR to dial a stored number in synchronous mode: Store the telephone number by the asynchronous command &Zn=. Use the DEFAULT DIAL parameter menu or *Dn command to select the default dial pointer. Set &D1 and either &M1 or &M3, then raise DTR from your terminal or communication software. The modem will dial the default stored number. After the modem is connected, the modem will enter synchronous operation.
