CMX228S1 MX-COM, Inc., CMX228S1 Datasheet - Page 15

• Manufacturer Part Number: CMX228S1
• Description: ISDN data and telephony protocol engine with x.25
• Manufacturer: MX-COM, Inc.

ISDN Data and Telephony Protocol Engine with x.25
4.6
4.6.1
The following Hayes commands are supported:
Valid Hayes commands are responded to with an 'OK' result code. Invalid commands are rejected with an
'ERROR' result code.
If when entering an AT command, no command or register name suffix is supplied, a suffix of zero is
assumed. If when changing a register value, no value is supplied a value of zero or an empty string is
assumed: e.g. ATS0=<CR> is equivalent to ATS0=0<CR>.
If a data call is active when a command is entered, the command will be processed. The ATO command will
respond ‘OK’, but will not then enter the data state: it will stay in the command state.
Where commands set a parameter, these are saved in external EEPROM if they are entered correctly.
The CMX228 will auto-baud and auto-parity on Hayes commands at the following speeds:
The auto-bauding process looks for the characters ‘AT’ or ‘at’ either as 8 bits no parity or 7 bits even, or odd,
parity. An error in the auto-bauding process results in auto-bauding being restarted.
After auto-bauding successfully, the CMX228 waits to receive a complete Hayes command line before
processing it. Embedded spaces are ignored and the case (upper or lower) of characters after the ‘AT’ does
not matter. The command line is terminated by <CR>, by 250 characters (not including the ‘AT’) or by a time-
out (from successful auto-bauding on an ‘AT’) of 180 seconds.
All characters in the Hayes command, including the ‘AT’ and <CR> terminator are echoed (if E1 is set) by the
CMX228 as they are sent by the DTE.
Receipt of a backspace will cause the CMX228 to send a "back space, space, back space" sequence of
characters to the DTE to allow the terminal to clear its screen of the last character. Also the last character
received will be discarded unless the last characters received were the ‘AT’ used for auto-bauding, i.e. the
‘AT’ is never deleted.
The escape sequence ‘+++’ (with Guard Time = 1s before and after the sequence) will cause the CMX228 to
enter the command state from the data state and to return an ‘OK’ response. Sending an ATO command will
be ignored, i.e. the CMX228 remains in the command state.
MX-COM, Inc
4800 Bethania Station Road, Winston-Salem, NC, 27105-1201, USA
www.mxcom.com tel: [phone] 744 5050 fax: [phone]
All trademarks and service marks are held by their respective companies
Data Configuration
Hayes Command Set
9600bps
19200bps
38400bps
57600bps
115200bps
A
D
E
H
I3
Q
V
X
&C
&D
&F
&K
&V
&Z
- Answers a call
- Dial
- Echo Hayes commands or not
- Hang-up
- Firmware part number
- Result code display
- Result code form
- Result code set
- Carrier detect
- Data terminal ready
- Load factory default
- Flow control
- View active and stored profiles
- Store directory number
15
2000 Chiron Technology Limited
CMX228 Advance Information
Doc. # 20480216.001
2000 MX-COM, Inc.