X09-019WNC Digi International/Maxstream, X09-019WNC Datasheet - Page 37

• Manufacturer Part Number: X09-019WNC
• Description: MOD RF 900MHZ 19.2K W/WIRE ANT
• Manufacturer: Digi International/Maxstream
• Series: XStream™r

Specifications of X09-019WNC

• Frequency: 900MHz
• Data Rate - Maximum: 19.2kbps
• Modulation Or Protocol: FSK
• Power - Output: 100mW
• Sensitivity: -110dBm
• Voltage - Supply: 5V
• Current - Receiving: 50mA
• Current - Transmitting: 140mA
• Data Interface: PCB, Through Hole
• Antenna Connector: On-Board, Wire Antenna
• Operating Temperature: 0°C ~ 70°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Memory Size: -

XStream™ OEM RF Module – Product Manual v5.x00 [2006.02.24]
4.2. Basic Communications
4.2.1. Streaming Mode (Default)
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
communications, meaning that the RF link simply replaces a wired link.
Characteristics:
Required Parameter Values (TX Module): 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.
Streaming Mode Data Flow
Figure 4‐04. Streaming Mode State Diagram (TX Module)
Events & processes in this mode are common to all of the other RF
Modes.
NOTE: When streaming data, RB and RO parameters are only observed on
the first packet.
After transmission begins, the TX event will continue uninterrupted until
the DI buffer is empty or the streaming limit (TT Command) is reached.
As with the first packet, the payload of each subsequent packet includes
up to the maximum packet size (PK Command).
The streaming limit (TT Command) is specified by the transmitting
module as the maximum number of bytes the transmitting module can
send in one transmission event. After the TT parameter threshold is
reached, the transmitting module 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 receiving
modules stay synchronized with the transmitting module for the
duration of the transmission event (from preceding packet information).
However, due to interference, some receiving modules may lose data
(and synchronization to the transmitting module), particularly during
long transmission events.
Once the transmitting module has sent all pending data or has reached
the TT limit, the transmission event ends. The transmitting module will
not transmit again for exactly RN delay slots if the local (i.e.
transmitting module’s) RN parameter is set to a non-zero value. The
receiving module(s) will not transmit for a random number of delay s
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 following
long bursts of packets from a single transmitting module, during which several receiving modules
may have become ready to transmit.
© 2006 MaxStream, Inc. Confidential and Proprietary
• Broadcast - By default, XStream Modules communicate through Broadcast communications
• Addressed - If addressing parameters match, received RF data is forwarded to the DO (Data
and within a peer-to-peer network topology. When any module transmits, all other modules
within range will receive the data and pass it directly to their host device.
Out) buffer; otherwise, the RF data is discarded.
Highest data throughput
Lowest latency and jitter
Reduced immunity to interference
Transmissions never acknowledged (ACK) by receiving module(s)
lots
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