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Fax Operation
Modem 3600 9-7
Receive Silence +FRS=(Time)
The command +FRS= causes the modem to listen for silence and report
back an OK result code when the line has been silent for the specified
amount of time. The (Time) value is in 10 ms increments from 0 to
2.55 seconds.
The modem aborts the command and sends an OK result code if the
DTE sends an additional character, which is discarded, during the
command execution. This command returns an ERROR result code if
issued while the modem is on hook.
Fax Transmit and Receive Modes
The following commands instruct the modem to transmit or receive
facsimile data with the designated modulation. Flow control, data
buffering, and data filtering are used as appropriate, in accordance with
the Class 1 specification. Each of these commands must be the last
command on the command line.
The modem accepts one of the values listed in Table 9-1.
Command Operation
+FTM=(MOD) Transmit data with (MOD) carrier
+FRM=(MOD) Receive data with (MOD) carrier
+FTH=(MOD) Transmit HDLC data with (MOD) carrier
+FRH=(MOD) Receive HDLC data with (MOD) carrier
Table 9-1. Values for Fax Modulatio n
Value Modulation Speed
3 V.21 channel 2 300 bps
24 V.27 ter 2400 bps
48 V.27 ter 4800 bps
72 V.29 7200 bps
73 V.17 7200 bps
74 V.17 7200 bps *
96 V.29 9600 bps
97 V.17 9600 bps
*
with short train