Telenetics 56 - Manual (Page 101)

AT Commands
Page 93
or WinRPI95 driver software is installed in the PC.
16 Reserved
17 Reserved
Result Codes
OK 0 to 3, 11, 16, 17
ERROR Otherwise.
+ITF - Transmit Flow Control Thresholds
The +ITF command determines the flow control thresholds used by the modem for
transmit data from the DTE. This optional compound parameter allows the DTE to
determine the input buffer size in the modem for data on circuit 103 (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. The DTE can
adjust its own thresholds for flow control of data on circuit 104 (received data) from the
modem.
Syntax +ITF=[<off>[,<on>[,<report_period>]]]
Defined Value
<off> Determines the threshold, in octets, above which the modem will
generate a flow off signal. Applicable in Synchronous Access and Frame
Tunneling modes. Default <off> value is 255.
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 DC1 and DC3 if
these are used to signal <modem-by-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 not
modified.
<on> Determines the threshold, in octets, below which the modem will
generate a flow on signal. Applicable in Synchronous Access and Frame
Tunneling modes. Default <on> value is 64.
<report_period> Not supported. A fixed value of zero is used and reported.
Reporting Selected Options
The modem sends a string of information text to the DTE consisting of selected options in
response to the following command:
+ITF?
The response is:
+ITF? <off>,<on>,<report_period>
Example:
+ITF?
+ITF: 255,64,0 Default values
Reporting Supported Options
The modem sends a string of information text to the DTE consisting of supported options in
response to the following command:
+ITF?
The response is:
+ ITF: (list of supported <off> values),(list of supported <on>
values),(list of supported <report_period> values)
Example: