Rainbow Electronics GM862-GPS - Manual (Page 84)

GM862-GPS Software User Guide
1vv0300729 Rev. 5 - 05/07/07
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In this case, the GPIO3 pin was set in output direction and its status has been set to HIGH.
3.6.2.3 Using GPIO4 pin as RF Transmission Control (alternate function)
When you set the GPIO4 pin as RF Transmission Control input function, the pin forces the Transmitter
to be OFF when the application set to LOW the line. To set the pin in alternate function you must
specify also a dummy value for the pin state:
•
Send command
AT#GPIO=4,<dummy_value>,2<cr>
where:
<value> is a dummy value can be either:
0 – dummy value
1 – dummy value
•
wait for response OK
TIP: Remember that the alternate function places the GPIO4 pin always in INPUT direction.
NOTE: The #GPIO4 direction setting is saved and will be kept after a power off.
The saving can be applied only for the alternate mode.
3.6.2.4 Using GPIO5 pin as RFTXMON OUTPUT (alternate function)
When you set the GPIO5 pin as RFTXMON output function, the pin reports the Transmitter active
status. To set the pin in alternate function you must specify also a dummy value for the pin state:
•
Send command
AT#GPIO=5,<dummy_value>,2<cr>
where:
<value> is a dummy value can be either:
0 – dummy value
1 – dummy value
•
wait for response OK
TIP: Remember that the alternate function places the GPIO5 pin always in OUTPUT direction.
NOTE: The #GPIO5 direction setting is saved and will be kept after a power off.
The saving can be applied only for the alternate mode.
For example:
1- Let's assume you want to set GPIO5 pin as RFTXMON OUTPUT:
command: