HP X09 Manuel télécharger pdf (Page 36)

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

SY (Time before Initialization) Command

AT Command: ATSY

Binary Command: 0x17 (23 decimal)

<Networking> SY Command keeps a

communication channel open as long as modem

transmits or receives before the active connection

expires. It can be used to reduce latency in a

query/response sequence and should be set 100

ms longer than the delay between transmissions.

Parameter Range: 0 – 0xFF

This command allows multiple XStream Modems

to share a hopping channel for a given amount of

time after receiving data. By default, all packets

include an RF initializer that contains channel information used to synchronize any listening

receivers to the transmitter’s hopping pattern. Once a new modem comes within range or is

powered on within range, it is able to instantly synchronize to the transmitter and start receiving

data. If no new modems are introduced into the system, the synchronization information

becomes redundant once modems have become synchronized.

[x 100 milliseconds]

Default Parameter Value: 0 (Disabled - channel

initialization information is sent with each RF

packet.)

Number of bytes returned: 1

SY Command allows the modems to remove this information from the RF Initializer after the

initial synchronization. For example, changing the SY Parameter to 0x14 (20 decimal) allows all

modems to remain in sync for 2 seconds after the last data packet was received. Synchronization

information is not re-sent unless transmission stops for more than 2 seconds. This command

allows significant savings in packet transmission time.

Warning: Not recommended for use in an interference-prone environment. Interference can

break up the session and the communications channel will not be available again

until SY time expires.

With SY set to zero, the channel session is opened and closed with each transmission - resulting

in a more robust link with more latency.

TO (DO2 Timeout) Command

AT Command: ATTO

Binary Command: 0x31 (49 decimal)

Parameter Range: 0 – 0xFFFF [x 1 second]

Default Parameter Value: 3

Number of bytes returned: 2

Minimum Firmware Version Required: 4.30

<Serial Interfacing>DO2 output will return to

default after no DI2 status information is

received during the timeout period.

Use with CS = 2 or 4.

TR (Transmit Error Count) Command

AT Command: ATTR

Binary Command: 0x1B (27 decimal)

Parameter Range: 0 – 0xFFFF

Default Parameter Value: 0

Number of bytes returned: 2

Related Commands: RR (Retries)

Minimum Firmware Version Required: 4.22

<Diagnostics> TR Command records the number

of retransmit failures. This number is

incremented each time a packet is not

acknowledged within the number of retransmits

specified by the RR (Retries) Command. It

therefore counts the number of packets that were

not successfully received and have been dropped.

The TR Parameter is not non-volatile and will

therefore be reset to zero each time the modem

is reset.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 55 56

Commentaires sur ces manuels

Pas de commentaire

HP X09 Manuel Page 36

Commentaires sur ces manuels

Produits connexes et manuels pour Mise en réseau HP X09