YAMAHA FINE TECHNOLOGIES CO. LTD. RF001-4 Manuale Utente
Instruction Manual / Chapter 3 Instructions for Use
13
3-4.
I/O Control
3-4-1.
Power Control
In this system, power doesn’t supplied to the internal control circuit unless the PWRON terminal of
I/O connector is asserted. After asserting the PWRON terminal, wait for the ready state of the
internal control circuit(READY is asserted.) before starting the serial communication.
Refer to the following figure about the time between the PWRON terminal is asserted and the
READY is asserted.
I/O connector is asserted. After asserting the PWRON terminal, wait for the ready state of the
internal control circuit(READY is asserted.) before starting the serial communication.
Refer to the following figure about the time between the PWRON terminal is asserted and the
READY is asserted.
+5V
PWRON
READY
300msecMAX.
Figure 6 PWRON-READY Characteristic
3-4-2.
Antenna Selection
To select the antenna to be used, control the CHSEL0, SHSEL1 terminal of I/O connector.
The relations of the antenna and the CHSEL0, SHSEL1 terminal are described below.
The relations of the antenna and the CHSEL0, SHSEL1 terminal are described below.
CHSEL0
CHSEL1
ANT1
NEGATE
NEGATE
ANT2
ASSERT
NEGATE
ANT3
NEGATE
ASSERT
ANT4
ASSERT
ASSERT
Caution: Don’t change antenna channel during RF wave transmission. If changed, internal
circuit may be damaged.
Before switching antenna channel, stop RF wave transmission by serial command, or
turn off RF module power by the PWRON terminal of I/O.
Before switching antenna channel, stop RF wave transmission by serial command, or
turn off RF module power by the PWRON terminal of I/O.