Product data
USRobotics 
Command Reference
Fax Class 1 and Fax Class 1.0 Commands - 114
Reporting Supported Range of Parameter Values 
Command: +FTS=? 
Response:  +FTS: <time> range 
Example: +FTS: 0-255 
+FRS - Receive Silence 
This command causes the modem to listen and report an OK result code when 
silence has been detected on the line for the specified period of time. This 
command will terminate when the required period of silence is detected or when 
the DTE sends the modem another character other than XON or XOFF, which is 
discarded. In either event, the OK result code is returned. 
This command is aborted if any character is received from the DTE after receipt of 
the command but before the time delay elapses. In this case, the modem discards 
the aborting character and issues an OK result code. 
Syntax 
+FRS =<time> 
Defined Values 
<time>  Decimal number from 0 (default) to 255 which specifies the length 
of time in 10-ms intervals to delay before responding with the OK 
result code after detecting silence on the line. 
Result Codes 
OK  Reported when silence has been present on the line for the 
specified amount of time or when the DTE sends the modem a 
character other than XON or XOFF. 
ERROR  <value> is invalid or this command is issued while the modem is 
on-hook. 
Reporting Supported Range of Parameter Values 
Command: +FRS=? 
Response: +FRS: <time> range 
Example: +FRS: 0-255 
+FTM - Transmit Facsimile 
This command causes the modem to transmit data using the modulation defined 
below. When a valid <mod> value is entered, the modem transmits the proper 
training sequence in the selected mode, followed by constant 1 bits until data is 
received from the DTE. The modem also returns the CONNECT result code at the 










