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XStream‐PKG‐R™RS‐232/485RFModem–ProductManualv5.x00[2006.02.24]
Pin Sleep (SM = 1)
Pin Sleep requires the least amount of power. In order to achieve this state, the DI3 (SLEEP) pin
must be asserted (high). The modem remains in Pin Sleep until the DI3 pin is de-asserted.
After enabling Pin Sleep, the SLEEP pin controls whether the XStream Modem is active or in Sleep
Mode. When DI3 is de-asserted (low), the modem is fully operational. When DI3 is asserted
(high), the modem transitions to Sleep Mode and remains in its lowest power-consuming state
until the DI3 (SLEEP) pin is de-asserted. DI3 is only active if the modem is setup to operate in
this mode; otherwise the pin is ignored.
Once in Pin Sleep Mode, DO2 (
) is de-asserted (high), indicating that data should not be sent
to the modem. The PWR pin is also de-asserted (low) when the modem is in Pin Sleep Mode.
Note: The modem will complete a transmission or reception before activating Pin Sleep.
Serial Port Sleep (SM = 2)
Serial Port Sleep is a Sleep Mode in which the XStream Modem runs in a low power state until
serial data is detected on the DI pin.
When Serial Port Sleep is enabled, the modem goes into Sleep Mode after a user-defined period
of inactivity (no transmitting or receiving of data). This period of time is determined by ST (Time
before Sleep) Command. Once a character is received through the DI pin, the modem returns to
Idle Mode and is fully operational.
Cyclic Sleep (SM = 3-8)
Cyclic Sleep is the Sleep Mode in which the XStream Modem enters into a low-power state and
awakens periodically to determine if any transmissions are being sent.
When Cyclic Sleep settings are enabled, the XStream Modem goes into Sleep Mode after a user-
defined period of inactivity (no transmission or reception on the RF channel). The user-defined
period is determined by ST (Time before Sleep) Command.
While the modem is in Cyclic Sleep Mode, DO2 (
) is de-asserted (high) to indicate that data
should not be sent to the modem during this time. When the modem awakens to listen for data,
DO2 is asserted and any data received on the DI Pin is transmitted. The PWR pin is also de-
asserted (low) when the modem is in Cyclic Sleep Mode.
The modem remains in Sleep Mode for a user-defined period of time ranging from 0.5 seconds to
16 seconds (SM Parameters 3 through 8). After this interval of time, the modem returns to Idle
Mode and listens for a valid data packet for 100 ms. If the modem does not detect valid data (on
any frequency), the modem returns to Sleep Mode. If valid data is detected, the modem
transitions into Receive Mode and receives incoming RF packets. The modem then returns to
Sleep Mode after a Period of inactivity that is determined by ST “Time before Sleep” Command.
The modem can also be configured to wake from cyclic sleep when SLEEP/DI3 is de-asserted
(low). To configure a modem to operate in this manner, PW (Pin Wake-up) Command must be
issued. Once DI3 is de-asserted, the modem is forced into Idle Mode and can begin transmitting
or receiving data. It remains active until no data is detected for the period of time specified by
the ST Command, at which point it resumes its low-power cyclic state.
Note: The cyclic interval time defined by SM (Sleep Mode) Command must be shorter than the interval
time defined by LH (Wake-up Initializer Timer).
For example: If SM=4 (Cyclic 1.0 second sleep), the LH Parameter should equal 0x0B (“1.1” seconds).
With these parameters set, there is no risk of the receiving modem being asleep for the duration of
wake-up initializer transmission. “Cyclic Scanning” explains in further detail the relationship between
“Cyclic Sleep” and “Wake-up Initializer Timer”
©2006MaxStream,Inc.Confidential&Proprietary 17
- Product Manual v5.x00 1
- Contents 3
- 1.1. Features 4
- 1.2. Specifications 5
- 1.3. External Interface 6
- 2. InterfacingProtocol 7
- 3. RFModemOperation 12
- 3.1.3. Flow Control 13
- 3.2. Modes of Operation 14
- 3.2.3. Receive Mode 16
- 3.2.4. Sleep Modes 16
- 3.2.5. Command Mode 19
- 4. RFModemConfiguration 21
- 4.2. Programming Examples 22
- 4.2.2. Binary Commands 23
- 4.3. Command Reference Table 24
- 4.4. Command Descriptions 25
- 5. RFCommunicationModes 40
- 5.1. Addressing 41
- 5.2. Basic Communications 42
- 5.2.2. Repeater Mode 43
- 5.3.1. Acknowledged Mode 46
- 5.3.2. Multi-Streaming Mode 48
- FCC Certification 52
- OEM Labeling Requirements 53
- Antenna Usage 53
- FCC-Approved Antennas 54
- Restrictions 55
- Adapters 58
- Antennas 59
- 1-Year Warranty 60
- Ordering Information 60
- Contact MaxStream 61
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