XT09-MI【PDF 51/71 页】MODULE RF 900MHZ 1W 115K W/MMCX

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9XTend? ? OEM ? RF ? Module ?‐? Product ? Manual ? v2.x4x ? [2007.01.04]

4.3. Acknowledged Communications

4.3.1. Acknowledged Mode

Chapter ? 4 ?‐? RF ? Communication ? Modes

Attributes:

Reliable delivery through positive acknowledgements for each packet

Throughput, latency and jitter vary depending on the quality of the channel and

the strength of the signal.

Required Parameter Values (TX module): RR (Retries) >= 1

Related Commands: Networking (DT, MK, RR), Serial Interfacing (PK, RN, RO, RB, TT)

Recommended Use: Use for applications that require Reliable Delivery. If messages are smaller

than 256 bytes, use RB and RO commands to align RF packets to application packets.

Connection Sequence

Figure ? 4 ‐ 07. Acknowledged ? Mode ? State ?

Diagram ? (TX ? module)

After sending a packet while in

Acknowledged Mode, the TX (trans-

mitting) module listens for an ACK

(acknowledgement). If it receives

the ACK, it will either move on to

sending a subsequent packet (if

more transmit data is pending) or

will wait for exactly RN random delay

slots before allowing another trans-

mission (if no more data is pending

to be transmitted).

If the TX module does not receive

the ACK within the allotted time, it

will retransmit the packet with a new

RF initializer following the ACK slot.

There is no delay between the first

ACK slot and the first retransmission.

Subsequent retransmissions incur a

delay of a random number of delay

slots, between 0 and RN. If RN is set

to 0 on the TX module, there are

never any back-off delays between

retransmissions. Note that during

back-off delays, the TX module will

go into Idle Mode and may receive

RF data. This can have the effect of

increasing the back-off delay, as the

module cannot return to Transmit (or

retransmit) Mode as long as it is receiving RF data.

After receiving and acknowledging a packet, the RX (receiving) module will move to the next fre-

quency and listen for either a retransmission or new data for a specific period of time. Even if the

TX module has indicated that it has no more pending transmit data, it may not have received the

previous ACK, and so may retransmit the packet, possibly with no delay after the ACK slot. In this

case, the RX module will always detect the immediate retransmission, which will hold off the com-

munications channel and thereby reduce collisions. RX modules acknowledge each retransmission

they receive, but they only pass the first copy of a packet they receive out the UART.

RB and RO parameters are not applied to subsequent packets, meaning that once transmission

has begun, it will continue uninterrupted until the DI buffer is empty or the streaming limit (TT

parameter) has been reached. As with the first packet, the payload of each subsequent packet

includes up to the maximum packet size (PK parameter), and the TX module checks for more

pending data near the end of each packet.

? ? 2007 ? MaxStream, ? Inc.

????? 51

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