9XTend™
OEM
RF
Module
–
Product
Manual
v1.2.4
©
2005
MaxStream,
Inc.
Confidential
&
Proprietary
11
2.2.
Modes of Operation
XTend OEM RF Modules operate in six modes.
Figure
2.4.
XTend
Modes
of
Operation
Module
can
only
be
in
one
mode
at
a
time.
2.2.1.
Idle Mode
When not receiving or transmitting data, the module is in Idle Mode. The module uses the same
amount of power in Idle Mode as it does in Receive Mode.
The module shifts into the other modes of operation under the following conditions:
•
Serial data is received in the DI Buffer (Transmit Mode)
•
Valid RF data is received through the antenna (Receive Mode)
•
Command Mode Sequence is issued (Command Mode)
•
Sleep Mode condition is met (Sleep Mode)
•
Shutdown condition is met (Shutdown Mode)
The module automatically transitions back to Idle Mode after responding to these conditions.
2.2.2.
Transmit Mode
When the first byte of serial data is received from the UART in the DI buffer, the module attempts
to shift to Transmit Mode and initiate an RF connection with other modules. After transmission is
complete, the module returns to Idle Mode.
RF transmission begins after either of the following criteria is met:
1. RB bytes have been received by the UART and are pending for RF transmission.
[Refer to the RB (Packetization Threshold) Command, p28]
2. At least one character has been received by the UART and is pending for RF transmission;
and RO character times of silence been observed on the UART.
[Refer to the RO (Packetization Timeout) Command, p29]
Figure
2.5.
Transmit
Mode
Data
Flow
ter timeout trig
The charac
ger can
1
be disabled by setting RO to zero.
In this case, transmission will not
begin until RB bytes have been
received and are pending for RF
transmission. The RB parameter
may be set to any value between
and the RF packet size (PK (Max RF
Packet Size, p27), inclusive. Note
that transition to Transmit Mode
cannot take place during RF
reception; the RF reception must
complete before the radio can
transition into Transmit Mode.
