XT09-PKI-EA-NA Digi International/Maxstream, XT09-PKI-EA-NA Datasheet - Page 47
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XT09-PKI-EA-NA
Manufacturer Part Number
XT09-PKI-EA-NA
Description
MODEM RF 900MHZ 1W ETHER INT
Manufacturer
Digi International/Maxstream
Series
XTend™r
Datasheet
1.XT09-PKI-E.pdf
(62 pages)
Specifications of XT09-PKI-EA-NA
Function
Transceiver, Modem
Modulation Or Protocol
FHSS, FSK
Frequency
900MHz
Interface
RJ-45 Ethernet
Sensitivity
-110dBm
Data Rate - Maximum
10 kbps
Voltage - Supply
7 V ~ 28 V
Package / Case
Module
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Power - Output
-
Applications
-
9XTend‐PKG‐E™ Ethernet RF Modem – Product Manual v2.x4x [2007.01.04]
5.2. Basic Communications
5.2.1. Streaming Mode (Default)
Connection Sequence
Basic Communications are accomplished through two sub-types:
When using Basic Communications, any functions such as acknowledgements are handled at the
application layer by the OEM/integrator. The Broadcast Modes provide transparent communica-
tions, meaning that the RF link simply replaces a wired link.
Characteristics: Highest data throughput
Required Parameter Values (TX modem): RR (Retries) = 0
Related Commands: Networking (DT, MK, MY), Serial Interfacing (PK, RB, RO, TT)
Recommended Use: Mode is most appropriate for data systems more sensitive to latency and/or
jitter than to occasional packet loss. For example: streaming audio or video.
Figure 5‐04. Streaming Mode State Diagram (TX Module)
After transmission begins, the transmission event will con-
tinue uninterrupted until the DI buffer is empty or the
streaming limit (TT parameter) is reached. As with the first
packet, the payload of each subsequent packet includes up
to the maximum packet size (PK parameter).
The TT parameter (streaming limit) is specified by the TX
(transmitting) modem as the maximum number of bytes the
TX module can send in one transmission event. After the TT
parameter threshold is reached, the TX modem will force a
random delay of 1 to RN delay slots (exactly 1 delay slot if
RN = 0).
Subsequent packets are sent without an RF initializer since
RX (receiving) modems remain synchronized with the TX
modem for the duration of the transmission (from preceding
packet information). However, due to interference, some RX
modems may lose data (and synchronization to the TX
modem), particularly during long transmission events.
Once the TX modem has sent all pending data or has
reached the TT limit, the transmission event ends. The TX
modem will not transmit again for exactly RN delay slots if
the local (i.e. TX modem's) RN parameter is set to a non-
zero value. The RX modem(s) will not transmit for a random
number of delay slots between 0 and (RN-1) if the local (i.e.
receiving module's) RN parameter is set to a non-zero
value. These delays are intended to lessen congestion fol-
lowing long bursts of packets from a single TX modem, dur-
ing which several RX modems may have become ready to transmit.
© 2007 MaxStream, Inc., Confidential & Proprietary ‐ All Rights Reserved
• Broadcast - By default, XTend RF Modems communicate through Broadcast communications
• Addressed - If addressing parameters match are in order, received RF data is forwarded to the
• Events & processes in this mode are common to all of
• When streaming data, RB and RO parameters are only
and within a peer-to-peer network topology. When any modem transmits, all other modems
within range will receive the data and pass it directly to their host device.
DO (Data Out) buffer; otherwise, the RF data is discarded.
the other RF Modes.
observed on the first packet.
Lowest latency and jitter
Reduced immunity to interference
Transmissions never acknowledged (ACK) by receiving module(s)
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