Product data
USRobotics 
Command Reference
Fax Class 1 and Fax Class 1.0 Commands - 119
If a frame was received correctly. 
If the DTE sends any character other than XON or XOFF while 
the modem is in the configured flow control. 
ERROR  Reported if a frame was received in error. 
4.2.3 Service Class 1 Parameters 
+FAR - Adaptive Reception Control 
 If Adaptive Reception is enabled, the modem adaptively detects the selected 
message carrier or V.21 control messages. If the expected carrier is detected, the 
modem operates as specified in the respective +FRM=<mod> or +FRH=<mod> 
commands. If V.21 flag preamble is detected instead, the modem issues a 
+FRH:3 intermediate result code, and then executes an implied +FRH=3 
command. 
Write Syntax 
+FAR=<value> 
Defined Values 
<value>  Decimal number corresponding to the selected option. 
0 Disable Adaptive Reception. (Default.) 
1 Enable Adaptive Reception. 
Reporting Current or Selected Values 
Command: +FAR?
Response: +FAR: <value>
Example:  +FAR: 0 For the default setting.
Reporting Supported Range of Parameter Values 
Command: +FAR=?
Response: +FAR: (<value> range ) 
Example: +FAR: (0,1) 
+FCL - Carrier Loss Timeout 
This parameter allows the DTE to select the modem's loss-of-carrier delay 
between initial loss-of-carrier and qualified loss-of-carrier, when the modem will 
give up and exit a receive mode. Intermediate (less than FCL timeout) loss-of-
carrier should be indicated by insertion of the SQ-BAD signal quality indicator in 










