XIB-E【PDF 30/64 页】BOARD INTERFACE ETHERNET

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RO (Packetization Timeout) Command

AT Command: ATRO

Binary Command: 0x21 (33 decimal)

Parameter Range: 0 0xFFFF [x 200 祍]

Default Parameter Value: 0

Number of bytes returned: 2

Minimum Firmware Version Required: 4.2A

<Serial Interfacing> Set/Read the time of silence

(no bytes received) after which transmission

begins. After a serial byte is received and if no

other byte is received before the RO timeout, the

transmission will start.

RP (RSSI PWM Timer) Command

<Diagnostics> RP Command is used to enable

PWM (Pulse Width Modulation) output on the

CONFIG pin. The output is calibrated to show the

level the received RF signal is above the

sensitivity level of the module. The PWM pulses

vary from zero to 95 percent. Zero percent

means the received RF signal is at or below the

published sensitivity level of the module. The

following table shows levels above sensitivity and PWM values.

AT Command: ATRP

Binary Command: 0x22 (34 decimal)

Parameter Range: 0 - 0x7F

[x 100 milliseconds]

Default Parameter Value: 0 (disabled)

Number of bytes returned: 1

Minimum Firmware Version Required: 4.2A

The total period of the PWM output is 8.32 ms. Because there are 40 steps in the PWM output;

the minimum step size is 0.208 ms.

Table?03. PWM燙hart?/DIV>

dBm above Sensitivity

PWM percentage

(high period / total period)

47.5%

62.5%

77.5%

A non-zero value defines the time that the PWM output will be active with the RSSI value of the

last received RF packet. After the set time when no RF packets are received, the PWM output will

be set low (0 percent PWM) until another RF packet is received. The PWM output will also be set

low at power-up. A parameter value of 0xFF permanently enables the PWM output and it will

always reflect the value of the last received RF packet.

PWM output shares the Config input pin. When the module is powered, the Config pin will be an

input. During the power-up sequence, the Config pin will be read to determine whether the

module is going into AT Command Mode. After this, if RP parameter is a non-zero value, the

Config pin will be configured as an output and set low until the first RF packet is received. With a

non-zero RP parameter, the Config pin will be an input for RP ms after power up.

RR (Retries) Command

<Networking> Set/Read the number of retries

that can be sent for a given RF packet. Once RR

command is enabled (set to a non-zero value),

RF packet acknowledgements and retries are

enabled. After transmitting a packet, the

transmitter will wait to receive an

acknowledgement from a receiver. If the

acknowledgement is not received in the period of time specified by the RN (Delay Slots)

Command, the transmitter will transmit the original packet again. The packet will be transmitted

repeatedly until an acknowledgement is received or until the packet has been sent RR times.

AT Command: ATRR

Binary Command: 0x18 (24 decimal)

Parameter Range: 0 0xFF

Default Parameter Value: 0 (disabled)

Number of bytes returned: 1

Minimum Firmware Version Required: 4.22

Note: For retries to work correctly, all modules in the system must have retries enabled.

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