4 Fax Class 1 and Fax Class 1.0 Commands
4.1 Fax I/O Processing
The fax I/O interface supports asynchronous serial and parallel interfaces. The character
format is 8 bits data, no parity, and 1 stop bit. Start and stop elements are removed from the
transmit data and added to the receive data. Both transmit and receive data are buffered. Flow
control using XON/XOFF or RTS/CTS is provided.
Unique control character strings are identified, filtered, or reinserted into the I/O data stream.
These control characters and their resultant action are described below.
4.1.1 DTE-to-Modem Transmit Data Stream
Characters Detected Action Taken
<DLE><data> Delete <DLE><data> characters.
<DLE><ETX> Recognize as a string terminator and take appropriate action.
<DLE><DLE> Replace with single <DLE> character.
4.1.2 Modem-to-DTE Receive Data Stream
Characters Detected Action Taken
<DLE> Insert extra <DLE> ahead of <DLE>.
The modem also identifies the end of a frame by inserting <DLE><ETX> into the data stream
after the FCS bytes.
4.1.3 Fax Mode Selection
Fax Class 1 and Fax Class 1.0 commands are identified in Table 4-1. Fax Class 1.0 includes
all Fax Class 1 commands.
Table 4-1. Fax Class 1 and Fax Class 1.0 Commands
Command/Parameter Function Applicable in
Fax Class 1
Applicable in
Fax Class 1.0
+
FCLASS=<class> Select, read or test service class X X
+FAE=<value> Auto answer enable X X
+
FTS=
<
time
>
Stop transmission and pause X X
+
FRS=
<
time
>
Wait for silence X X
+
FTM=
<
mod
>
Transmit data with <mod> carrier X X
+
FRM=
<
mod
>
Receive data with <mod> carrier X X
+
FTH=
<
mod
>
Transmit HDLC data with <mod> carrier X X
+
FRH=
<
mod
>
Receive HDLC data with <mod> carrier X X
+
FAR=
<
off/on
>
Adaptive reception control - X
+
FCL=<time> Carrier loss timeout - X
+
FDD=
<
value
>
Double escape character replacement control - X
+
FIT=
<
time
>
,
<
action
>
DTE inactivity timeout - X
+FPR=<rate> Fixed DTE Rate - X
+
FMI Report manufacturer ID - X
+
FMM Report model ID - X
+
FMR Report revision ID - X
+FLO Flow Control - X
+IFC Local DTE-modem flow control (see +IFC command inSection 3.2.1) X X
A Answer (see A command in Section 3.2.3) X X
D
<
string
>
Dial (see D command in Section 3.2.3) X X
H Hangup (see H command in Section 3.2.3) X X
X = Applicable; - = Not applicable
4.1.4 Fax Origination
