5686G-PRO User Guide
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Copyright © 2018 USR, a Division of UNICOM Global
Fax Service Class 2.0 Commands
In addition to the standard Class 2.0 fax commands, U.S. Robotics implements the following optional
Class 2.0 fax commands:
+FNS=0,1
Pass-through, non-standard negotiation byte string
+FCR=0,1
Capability to receive.
+FAA=0,1
Adaptive Answer mode.
+FCT=0-255 sec.
Phase C Timeout
+FHS=0-255
Hangup Status Code, read only.
+FMS=0-3
Minimum Phase C Speed.
+FBS?=500,100
Buffer size, read only.
Fax Mode Flow Control Setting
Many facsimile software products use software flow control when the modem is in Fax mode.
Throughout our documentation, we recommend that you use hardware flow control for Data mode
(factory setting). However, to allow compatibility with software products that use software flow
control by default, U.S. Robotics fax modems automatically change to software flow control when
entering Fax mode.
FCC Notice
FCC part 68, rules regarding fax operation, has been amended as follows:
Telephone facsimile machines identification of the sender of the message: It shall be unlawful for any
person within the United States to use a computer or other electronic device to send any message
via a telephone facsimile machine unless such a message clearly contains, in a margin at the top or
bottom of each transmitted page or on the first page of the transmission, the date and time it is sent
and an identification of the business, other entity, or individual sending the message and the
telephone number of the sending machine or of such business, other entity, or individual. Telephone
facsimile machines manufactured on and after December 20, 1992 must clearly mark such identif ying
information on each transmitted page.
Notes
If you want to know more about the supported Class 1 fax commands, refer to the standard for the
Service Class 1 fax protocol:
TIA/EIA-578-1990 (EIA-578)
Asynchronous Facsimile DCE Control Standard - Service Class 1
November 1990 Revision: B
