FIRMWARE DESCRIPTION
Data Mode
2.10
•
19.01.2007
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3.3.4.5 Data
Transmission
This section describes the operational rules for data transmission in transparent data mode.
3.3.4.5.1 Alignment with call control
Any data received from the host through the RS-232 interface while there is no call
established will be discarded by the module.
When requesting a call the host must wait until the call is established before starting sending
data. Otherwise this data may be lost.
When a call has been established, data is transferred in full-duplex mode between the hosts
through the RS-232 interface.
Any data sent by the host to the module through the RS-232 interface after the call has been
released is discarded by the module
3.3.4.5.2 Usage of modem lead signals
A host may use the modem lead signals to control and monitor equipment connected to the
RS-232 interface of the peer.
When using modem lead signals attention must be paid to the influence of interworking (see
section 3.3.4.3).
A host must not pull DTRI inactive for more than 4 seconds for any other purpose than
releasing the call. However the host may pull DTRI inactive for shorter intervals, e.g. to
control a modem connected to the RS-232 interface of the peer.
3.3.4.5.3 Escaping to configuration mode
The configuration mode may be entered from transparent data mode by sending the escape
se-+ to the module. If the module detects the escape sequence while a call is
established, it will immediately release the call.
The following timing requirements apply:
•
Before the first + character and after the last + character there must be a pause of at
least 200ms
•
Between two characters of the escape sequence the maximum allowed pause is 500ms.