XT09-MI【PDF 34/71 页】MODULE RF 900MHZ 1W 115K W/MMCX

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

RN (Delay Slots) Command

<Networking & Security> The RN command is

used to set/read the time delay that the transmit-

ting RF module inserts before attempting to

resend a packet. If the transmitting module fails

to receive an acknowledgement after sending a

packet, it inserts a random number of delay slots

(ranging from 0 to (RN minus 1)) before attempt-

ing to resend the packet. Each delay slot is 5

msec (when BR=1) and 54 msec (when BR=0).

If two modules attempt to transmit at the same

Chapter ? 3 ?‐? RF ? Module ? Configuration

AT Command: ATRN

Binary Command: 0x19 (25 decimal)

Parameter Range: 0 - 0xFF [38 ms slots]

Default Parameter Value: 0

(no delay slots inserted)

Number of bytes returned: 1

Related Commands: RR (Retries), TT

(Streaming Limit)

time, the random time delay after packet failure allows only one module to transmit the packet

successfully; while the other module waits until the channel available for RF transmission.

RN Command is only applicable if retries have been enabled [RR (Retries) Command] or if forced

delays will be inserted into a transmission [TT (Streaming Limit) Command].

RO (Packetization Timeout) Command

<Serial Interfacing> The RO command is used to

set/read the Packetization Timeout setting. RF

transmission begins when data is in the DI buffer

and either of the following criteria are met:

? RO character times of silence on the UART

receive lines (after receiving at least 1 byte)

? RB characters have been received by the

UART

RB and RO criteria only apply to the first packet of

a multi-packet transmission. If data remains in

AT Command: ATRO

Binary Command: 0x21 (33 decimal)

Parameter Range: 0 - 0xFFFF

[ x UART character times ]

Default Parameter Value: 3

Number of bytes returned: 2

Related Commands: RB (Packetization

Threshold)

the DI Buffer (UART receive) after the first packet, transmissions will continue in a streaming man-

ner until there is no data left in the DI Buffer.

When RO is the transmission-beginning criteria : The actual time between the reception of

the last character from the UART and the beginning of RF transmission will be at least 800 μsec

longer than the actual RO time to allow for transmission setup. Additionally, it is subject to 100-

200 μsec of additional uncertainty, which could be significant for small values of RO at high UART

bit rates.

The correct UART character time (10, 11, or 12 bits) is calculated based on the following criteria:

? 1 start bit

? 8 data bits

? 0 or 1 parity bit [as determined by the NB (Parity) Command)

? 1 or 2 stop bits [as determined by SB (Stop Bits) Command]

? ? 2007 ? MaxStream, ? Inc.

????? 34

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