V.22 bis Modem with AT Commands
CMX866
n=0 Disables the echoing of commands to the external host µC.
n=1 Enables echoing of commands to the external host µC (default).
Hn
Hook Switch Control
Syntax: ATHn<CR>
Modifier Usage
n=0 Instructs the CMX866 to go on-hook (RDRVN pin goes high). This disconnects
the CMX866 from the line (default).
n=1 Instructs the CMX866 to go off-hook (RDRVN pin goes low).
Line disconnection also occurs if the CMX866 is placed in 'Zero-Power' or
Powersave mode, if the RESETN pin is taken low or, in certain cases, if the DTRN
pin is taken high (see &Dn command).
In
Identification
Requests the CMX866 to return its product identification information.
Syntax: ATIn<CR>
Modifier Usage
n=0 Displays the product identification:
Modulation Fallback Option
Syntax: ATNn<CR>
"CMX866"
Nn
Modifier Usage
n=0 When originating or answering, the CMX866 negotiates only at the specified
communications standard.
n=1 When originating or answering, the CMX866 falls back from V.22bis to V.22,
as required (default).
O
Change to Data Transfer Mode
Used during on-line AT Command mode, this command changes the CMX866
operation to Data Transfer mode, without initiating any retrain sequence.
Syntax: ATO<CR>
Qn
Enable/Disable Modem Responses
Syntax: ATQn<CR>
Modifier Usage
n=0 Enables result codes. Codes are issued to the external host µC (default).
n=1 Disables result codes. Codes are not issued to the external host µC.
RO
Change to Data Transfer Mode in Reverse Direction
Used during on-line AT Command mode to execute a V.23 turnaround if enabled
(see S14 and S24 registers), then returns to Data Transfer mode, like the O
command above.
Syntax: ATRO<CR>
ã 2004 CML Microsystems Plc
21
D/866/4
CMLMICRO [ CML MICROCIRCUITS ]
