CMX228 datasheet(21/38 Pages) CMLMICRO

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ISDN Data and Telephony Protocol Engine (inc. X.25)

CMX228

D/228/1

Format: AT&F<CR>

Sets the following commands and registers to their default values.

It does not change the %A !B, !C registers or the &Z command.

Commands:

Registers:

S37

Format: AT&F9<CR>

Sets all commands and registers to the default values and resets LED indicator and RS232 interface

pins accordingly.

&K (Flow Control)

Format: AT&Kn<CR>

Indicates the method of flow control to be used between the CMX228 and the DTE when in the data

state. There is no flow control when the CMX228 is in the command state.

Suffix n

Description

No flow control

3 (default)

Bi-directional RTS/CTS signals

Flow control is only active when in an active data call, ie not when dealing with Hayes commands.

Flow control is applied to the DTE in the following situations:

(i) The remote end signals flow control (the mechanism is protocol dependent).

(ii) Several buffers of data are held waiting transmission across ISDN.

Flow control is applied to the remote end (the mechanism is protocol dependent) if excessive data is

held pending transmission to the DTE, so as to prevent local buffer overflow.

&V (View Active/Stored Profiles)

Format: AT&V<CR>

Causes the CMX228 to display the following command and register values for the stored profile:

Commands:

Registers:

S37

&Z (Store Directory Number)

Format: AT&Z3={DN}<CR>

This command instructs the CMX228 to store a directory number. The stored directory number is then

used by the X.25 call setup as the ‘Calling NUA’.

A directory number consists of a string of characters from the set 0..9, S and

##. The ‘=‘ character can

be omitted. Where a store number is entered, only the value 3 will give an ‘OK’ response. The

contents of the &Z directory number are displayed by using the &V0 command. Up to 20 digits can be

saved. The number must be in quotes. eg at&z3 =’12345’.

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