X24-019PKC-UA Digi International/Maxstream, X24-019PKC-UA Datasheet - Page 11

• Manufacturer Part Number: X24-019PKC-UA
• Description: MODEM RF 2.4GHZ 19.2KBPS USB
• Manufacturer: Digi International/Maxstream
• Series: XStream™r

Specifications of X24-019PKC-UA

• Function: Transceiver, Modem
• Modulation Or Protocol: FHSS
• Frequency: 2.4GHz ~ 2.4835GHz
• Applications: General Purpose
• Interface: USB
• Sensitivity: -102dBm
• Power - Output: 17dBm (50mW)
• Data Rate - Maximum: 20 kbps
• Voltage - Supply: 5V
• Package / Case: Module
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

XStream‐PKG‐U™ USB RF Modem – Product Manual v4.2B5 [2006.02.27]
2.2.3. Receive Mode
2.2.4. Sleep Mode
If a modem detects RF data while operating in Idle Mode, the modem transitions into Receive
Mode to start receiving RF packets.
Figure 2‐05. Reception of RF Data
After a packet is received, the modem checks
the CRC (cyclic redundancy check) to ensure
that the data was transmitted without error. If
the CRC data bits on the incoming packet are
invalid, the packet is discarded. If the CRC is
valid, the packet proceeds to the DO Buffer.
The modem returns to Idle Mode after valid RF
data is no longer detected or after an error is
detected in the received RF data. If serial data is
stored in the DI buffer while the modem is in
Receive Mode, the serial data will be transmitted
after the modem is finished receiving data and
returns to Idle Mode.
Sleep Modes enable the XStream Modem to operate at minimal power consumption when not in
use. Three Sleep Mode options are available:
For the modem to transition into Sleep Mode, the modem must have a non-zero SM (Sleep Mode)
Parameter and one of the following must occur:
1.
2.
In Sleep Mode, the modem will not transmit or receive data until the modem first transitions to
Idle Mode. All Sleep Modes are enabled and disabled using SM Command. Transitions into and
out of Sleep Modes are triggered by various mechanisms as shown in the table below.
Table 2‐01. Summary of Sleep Mode Configurations
Sleep Mode
Setting
Pin Sleep
(SM = 1)
Serial Port Sleep
(SM = 2)
Cyclic Sleep
(SM = 3-8)
For more information about Sleep Modes, refer to the individual commands listed in “Related Commands”
column of the table. The SM Command is to the implementation of all sleep mode configurations.
© 2006 MaxStream, Inc. Confidential and Proprietary
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The modem is idle (no data transmission or reception) for a user-defined period of time
[Refer to ST (Time before Sleep) Command].
SLEEP pin is asserted (only for Pin Sleep option).
Pin Sleep (Host Controlled)
Serial Port Sleep (Wake on Serial Port activity)
Cyclic Sleep (Wake on RF activity)
Transition into
Sleep Mode
A microcontroller can shut down and wake
modems by asserting (high) SLEEP pin.
Note: The module will complete a transmission
or reception before activating Pin Sleep.
Automatic transition to Sleep Mode occurs
after a user-defined period of inactivity (no
transmitting or receiving of data). The period of
activity is defined using the ST (Time before
Sleep) Command.
Automatic transition to Sleep Mode occurs in
cycles as defined by the SM (Sleep Mode)
Command.
Note: The cyclic sleep time interval must be
shorter than the “Wake-up Initializer Timer”
(set by LH Command).
Transition out of
Sleep Mode
De-assert SLEEP
pin.
When serial byte is
received on the DI
pin.
After the cyclic sleep
time interval elapses.
Note: Modem can be
forced into Idle Mode
if PW (Pin Wake-up)
Command is issued.
Related
Commands
SM
SM, ST
SM, ST, HT,
LH, PW
Typical Power
Consumption
50 mA
130 mA
75 mA
when sleeping
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