XT09-PKC-UA Digi International/Maxstream, XT09-PKC-UA Datasheet - Page 51
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XT09-PKC-UA
Manufacturer Part Number
XT09-PKC-UA
Description
MODEM RF 900MHZ 1W USB W/ ACC
Manufacturer
Digi International/Maxstream
Series
XTend™r
Specifications of XT09-PKC-UA
Function
Transceiver, Modem
Modulation Or Protocol
FSK
Frequency
902MHz ~ 928MHz
Applications
General Purpose
Interface
USB
Sensitivity
-110dBm
Power - Output
1W
Data Rate - Maximum
115 kbps
Voltage - Supply
7 V ~ 28 V
Package / Case
Module
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
9XTend‐PKG‐U™ USB RF Modem – Product Manual v2.x4x [2007.01.04]
The TT parameter (streaming limit) specifies the maximum number of bytes that the TX modem
will send in one transmission event, which may consist of many packets and retries. If the TT
parameter is reached, the TX modem will force a random delay of 1 to RN delay slots (exactly 1
delay slot if RN is zero). Each packet is counted only once toward TT, no matter how many times
the packet is retransmitted.
Subsequent packets in Acknowledged Mode are similar to those in Streaming Mode, with the addi-
tion of an ACK between each packet, and the possibility of retransmissions. Subsequent packets
are sent without an RF initializer, as the RX modems are already synchronized to the TX modem
from the preceding packet(s) and they remain synchronized for the duration of the transmission
event. Each retransmission of a packet includes an RF initializer.
Once the TX modem has sent all pending data or has reached the TT limit, the acknowledged
transmission event is completed. The TX modem will not transmit again for exactly RN delay slots,
if the local RN parameter is set to a non-zero value. The RX modem will not transmit for a random
number of delay slots between 0 and (RN-1), if the local RN parameter is set to a non-zero value.
These delays are intended to lessen congestion following long bursts of packets from a single TX
modem, during which several RX modems may have themselves become ready to transmit.
© 2007 MaxStream, Inc., Confidential & Proprietary ‐ All Rights Reserved
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