Product data

USRobotics
Command Reference
Data Command Set - 67
+ITF - Transmit Flow Control Thresholds
In V.80 Synchronous Access Mode, this optional compound parameter allows the
DTE to determine the effective input buffer size in the modem for data on transmit
data from the DTE, to control the thresholds used for flow control of such data,
and to control how often the modem reports to the DTE the number of octets in
this buffer. Note that the DTE can adjust its own thresholds for flow control of data
on received data from the modem.
Syntax
+ITF=[<off>[,<on>[,<report_period>]]]
Defined Values
<off> Determines the threshold, in octets, above which the modem will
generate a flow off signal. Applicable in Synchronous Access
Mode.
The <off> range is 20 -7000. Default <off> value is 128.
For the <on> and <off> subparameters, the input buffer is
assumed to reside between the modem's V.24 interface and the
Synchronous Access protocol layer; i.e., the buffer count includes
all octets, including EM codes, received from the DTE, with the
exception of XON and XOFF if these are used to signal
<modemby-DTE> flow control.
The modem returns the ERROR result code if the DTE specifies
that the <off> subparameter be set to a value less than or equal
to the <on> subparameter; in this case, the current parameter
value settings are set to default values.
<on> Determines the threshold, in octets, below which the modem will
generate a flow on signal. Applicable in Synchronous Access
Mode.
The <on> range is 10 -5000. Default <on> value is 64.
<report_period>
Not supported. A fixed value of zero is used and reported.
Reporting Current or Selected Values
Command: +ITF?
Response: +ITF: <off>,<on>,<report_period>
Example: +ITF: 128,64,0For default values
Reporting Supported Range of Parameter Values
Command: +ITF=?