HP X09 Manuál stáhnout pdf (Strana 32)

XStream‐PKG‐E™EthernetRFModem–ProductManualv5.x00[2006.02.24]

PW (Pin Wake-up) Command

AT Command: ATPW

Binary Command: 0x1D (29 decimal)

Parameter Range: 0 – 1

Parameter Configuration

0 Disabled

1 Enabled

Default Parameter Value: 0

Number of bytes returned: 1

Related Commands: SM (Sleep Mode), ST (Time

before Sleep)

Minimum Firmware Version Required: 4.22

<Sleep (Low Power)> Under normal operation, a

modem in Cyclic Sleep Mode cycles from an

active state to a low-power state at regular

intervals until data is ready to be received. If the

PW Parameter is set to 1, the SLEEP/DI3 Pin can

be used to awaken the modem from Cyclic Sleep.

If the SLEEP Pin is de-asserted (low), the modem

will be fully operational and will not go into Cyclic

Sleep. Once SLEEP is asserted, the modem will

remain active for the period of time specified by

ST (Time before Sleep) Command, and will return

to Cyclic Sleep Mode (if no data is ready to be

transmitted). PW Command is only valid if Cyclic

Sleep has been enabled.

RB (Packetization Threshold) Command

AT Command: ATRB

Binary Command: 0x20 (32 decimal)

<Serial Interfacing> RF transmission will

commence when data is in the DI Buffer and

either of the following criteria are met:

Parameter Range: 0 – 0x100 [bytes]

(Maximum value equals the current value of PK

Parameter (up to 0x100 HEX (800 decimal))

Default Parameter Value: 1

Number of bytes returned: 2

Related Commands: PK (RF Packet Size), RO

(Packetization Timeout)

Minimum Firmware Version Required: 4.30

• RO times out on the UART receive lines

(ignored if RO = 0)

• RB characters have been received by the

UART (ignored if RB = 0)

If PK is lowered below the value of RB; RB is

automatically lowered to match PK.

Note: RB and RO criteria only apply to the first packet of a multi-packet transmission. If data

remains in the DI Buffer after the first packet, transmissions will continue in streaming manner

until there is no data left in the DI Buffer (UART receive buffer).

RE (Restore Defaults) Command

<Diagnostics> RE Command restores all

configurable parameters to factory default

settings. However, RE Command will not write

the default values to non-volatile (persistent) memory. Unless the WR (Write) Command is issued

after the RE command, the default settings will not be saved in the event of modem reset or

power-down.

AT Command: ATRE

Binary Command: 0x0E (14 decimal)

RN (Delay Slots) Command

<Networking> RN Command is only applicable if

retries have been enabled [RR (Retries)

Command], or if forced delays will be inserted

into a transmission [see TT (Streaming Limit)

Command]. RN Command is used to adjust the

time delay that the transmitter inserts before

attempting to resend a packet. If the transmitter

fails to receive an acknowledgement after

sending a packet, it will insert a random number

of delay slots (ranging from 0 to (RN minus 1))

before attempting to resend the packet. Each delay slot lasts for a period of 38ms.

AT Command: ATRN

Binary Command: 0x19 (25 decimal)

Parameter Range: 0 – 0xFF [slots]

Default Parameter Value: 0 (no delay slots

inserted)

Number of bytes returned: 1

Related Commands: RR (Retries), TT

(Streaming Limit)

Minimum Firmware Version Required: 4.22

If two modems attempted to transmit at the same time, the random time delay after packet

failure would allow one of the two modems to transmit the packet successfully, while the other

would wait until the channel opens up to begin transmission.

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