GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 54 / 80
3.14. RF Transmitting Signal Indication
The M66 provides a RFTXMON pins which will rise when the transmitter is active and fall after the
transmitter activity is completed.
Table 21: Pin Definition of the RFTXMON
There are two different modes for this function:
1) Active during the TX activity
RFTXMON pin is used to indicate the TX burst, when it outputs a high level, 220us later there will be a TX
burst.
You can execute AT+QCFG=“RFTXburst”, 1 to enable the function.
The timing of the RFTXMON signal is shown below.
Transmit burst
RFTXMON
577us220us
220us 577us
4.615ms
Figure 38: RFTXMON Signal during Burst Transmission
Transmission signal indication
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