CMX218S1 MX-COM, Inc., CMX218S1 Datasheet - Page 16

• Manufacturer Part Number: CMX218S1
• Description: ISDN data and telephony protocol engine
• Manufacturer: MX-COM, Inc.

ISDN Data and Telephony Protocol Engine (no X.25)
The following is a more detailed description of the Hayes commands listed above:
A (Answer)
D (Dial)
Format: ATD{DN}<CR>
Format: ATDT{DN}<CR>
Format: ATDP{DN}<CR>
{DN} is a directory number of up to 23 ASCII characters from 0..9, $ and . This form of the ATD command
causes an outgoing SETUP message to be sent to the network with a Called Party Number Information
Element which contains the digits included in the command. Any commands that follow this command are
ignored.
If the CMX218 receives any character from the DTE after an ATD command, which causes a SETUP
message to be sent to the network, and before the call is connected, the attempt to make a call is abandoned,
i.e. a DISCONNECT message will be sent to the network and a ‘NO CARRIER’ result code returned.
Calls are established with the D command, irrespective of the state of the DTR pin. The result code response
is either:
Calls are cleared in the following way:
Incoming calls are indicated by a 'RING' result code. The call is automatically answered if S0 = 1 or more. If
S0 = 0 an ATA command must be entered, then a CONNECT message is sent to the network.
E (Echo)
Format: ATEn<CR>
This command tells the CMX218 whether or not to echo the characters received from the DTE when in
command mode. When echo is on, all non-control characters received from the DTE are echoed back to it.
H (Hang-up)
Format: ATH<CR>
Causes the CMX218 to clear the data call in progress. The command is not valid if there is no data call in
progress but always returns an ‘OK’ result code. It is only valid in the command state when a data call is in
operation, when it will send a DISCONNECT message to the network. Upon receipt of RELEASE, a
RELEASE COMPLETE is transmitted to the network and ‘OK’ returned to the DTE.
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Format:
Causes the CMX218 to answer an incoming data call, by sending a CONNECT message to the network. If
a CONNECT ACK is received the CMX218 enters the data state after returning a ‘CONNECT XXX’ result
code to the DTE on the RS232 port (where the XXX is the speed in baud). If a RELEASE, RELEASE
COMPLETE or DISCONNECT message is received a ‘NO CARRIER’ result code is returned. The
command is not valid if there is no incoming call and it will return ‘ERROR’.
iii.
ii.
i.
'CONNECT'
'NO CARRIER' - call rejected by the remote user or the network
'NO DIALTONE' - ISDN link down
'BUSY'
The remote end or network clears the call by sending a DISCONNECT message or the ISDN line
fails/is removed: 'NO CARRIER' is sent to DTE.
DTR is dropped (with a de-bounce period of 50ms) by DTE causing the CMX218 to send a
DISCONNECT message to the network and enter the disconnect state, awaiting a RELEASE
COMPLETE from the network. The CMX218 sends the 'OK' response when clearing of the ISDN call
is complete i.e. RELEASE and RELEASE COMPLETE messages have been transmitted across the
network, (dependant upon the state of &D command).
The DTE issues the escape sequence ‘+++ ‘(with Guard Time = 1s before and after the sequence),
receives an 'OK' response and then issues the Hang-up command (see section on H command
below). The CMX218 sends the 'OK' response when clearing of the ISDN call is complete.
Suffix n
0
1 (default)
ATA<CR>
- call successful. The CMX218 will automatically enter the data state.
- remote user busy and other causes
Description
Echo off
Echo on
16
2000 Chiron Technology Limited
CMX218 Advance Information
Doc. # 20480215.001
2000 MX-COM, Inc.