GE864-AUTO Hardware User Guide
1vv0300779 Rev.0 - 20/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 46 of 62
10.5 Using the RFTXMON Output GPIO5
The GPIO5 pin, when configured as RFTXMON Output, is controlled by the GE864-AUTO module and
will rise when the transmitter is active and fall after the transmitter activity is completed.
The TXMON
pin behaviour can be configured using the AT command
# TXMONMODE
This command will be available only under AT#SELINT=2.
# TXMONMODE – TTY-CTM DSP operating mode
# TXMONMODE – Set TXMON pin behaviour
AT# TXMONMODE
=<mode>
Set TXMON pin behaviour.
Parameter:
<mode>
0 – TXMON pin goes high when a call is started and it drops down when the call
is ended. It also goes high when a location update starts, and it drops down
when the location update procedure stops. Finally it goes high during SMS
transmission and receiving.
Even if the TXMON in this case is set as GPIO in output, the read command
AT#GPIO=5,2
returns
#GPIO:2,0
, as the GPIO is in alternate mode.
1 – TXMON is set in alternate mode and the Timer unit controls its
state. TXMON goes high 200
μ
s before TXEN goes high. Then power
ramps start raising and there is the burst transmission. Finally TXMON
drops down 47
μ
s after power ramps stop falling down. This behaviour is
repeated for every transmission burst.
Note 1: The
parameter
<mode>
is
saved in NVM
.
Note 2: if user sets GPIO 5 as input or output the TXMON does not follow the
above behaviour.
Note 3: if
<mode>
is change during a call from 1 to 0, TXMON goes down. If it is
restored to 1, TXMON behaves as usual, following the bursts.
Note 4: this command is not supported in GM862 product family
.
AT# TXMONMODE?
Read command reports the
<mode>
parameter set value, in the format:
#TXMONMOD: <mode>
AT#TXMONMODE=?
Test command reports the supported values for
<mode>
parameter.
For example, if a call is started, the line will be HIGH during all the conversation and it will be again
LOW after hanged up.
The line rises up 300ms before first TX burst and will became again LOW from 500ms to 1sec after
last TX burst.
