User's Manual

HAYES AT COMPATIBLE COMMAND SET

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234839, Revision 2.2

Type in the command: ATI9I9 <CR>

An AT is not required in front of the second I9 command

. You only need one attention code for each

command line. To make this command more readable, you can add spaces between the two commands:

Type in the command: AT I9 I9 <CR>

The modem will execute the command as if the spaces are not there.

Port Selection Modifier

Unlike conventional modems the RFI-9256 has two serial ports. Each can be configured

independently. So to allow access and configuration of alternative ports a modifier may be appended to the

end of the command string.

This modifier is a colon followed by a port number from 0-1. For example ‘:00’ would be port 00 also

called the Main port, ‘:01’ would be the Auxiliary port.

Typing in the command: ATS80:01 <CR>, would connect the port to the auxiliary port of

the remote unit addressed 80 (Rx = 80).

The Escape Sequence

When there is no communications link established to a remote modem, and you issue commands, all

dialogue is occurring between your computer and the local modem. This situation is known as Local

Command State.

When you connect to a remote modem, dialogue is occurring between your computer and the remote

modem (or what is connected to the remote modem). This is known as On-line State. Once a modem

enters on-line state, it assumes all the data you send it is to be sent on to the remote modem, so it ignores

any AT commands you give it.

To force the modem to return to local command state, enter an escape sequence. An escape sequence

consists of a one second delay, three characters (default is ‘+’) typed rapidly and another one-second delay.

For example if you dial a remote modem:

Type: ATDT 2000 <CR>

If the remote modem connects then the local modem will enter the ‘on-line’ state and your terminal will

display the message CONNECT.

Now try to view the modem’s firmware identity code:

There are some commands that cannot be linked as multiple commands. These commands have to appear on their own and are

outlined in the tables on page 70.