XStream
‐
PKG
‐
R™
RS
‐
232/422/485
RF
Modem
User’s
Guide
SM (Sleep Mode) Command
AT Command: ATSM
Binary Command: 0x01
Parameter Range: 0 – 8
Parameter
Value
Configuration
0 Disabled
1 Pin
Sleep
2
Serial Port Sleep
3
Cyclic 0.5 second sleep
(Modem wakes every 0.5
seconds)
4
Cyclic 1.0 second sleep
5
Cyclic 2.0 second sleep
6
Cyclic 4.0 second sleep
7
Cyclic 8.0 second sleep
8
Cyclic 16.0 second sleep
Default Parameter Value: 0
Number of bytes returned: 1
<Sleep Mode (Low Power)> SM Command is
used to adjust Sleep Mode settings. By default,
Sleep Mode is disabled and the modem remains
continually active. SM Command allows the
modem to run in a lower-power state and be
configured in one of eight settings.
Cyclic Sleep settings wake the modem after the
amount of time designated by SM Command. If
the modem detects a wake-up initializer during
the time it is awake, it will synchronize with the
transmitter and start receiving data after the
wake-up initializer runs its duration. Otherwise, it
returns to Sleep Mode and continue to cycle in
and out of inactivity until the Wake-up Initializer
is detected. If a Cyclic Sleep setting is chosen,
the ST, LH and HT parameters must also be set
as described in the “Sleep Modes” section of this
manual.
Related Commands:
34
Refer to the “Sleep Modes” section [p16] for
more information.
For Pin Sleep – PC (Power-up Mode), PW (Pin
Wake-up)
For Serial Port Sleep – ST (Time before Sleep)
For Cyclic Sleep – ST (Time before Sleep), LH
(Wake-up Initializer Timer), HT (Time Before
Wake-up Initializer), PW (Pin Wake-up)
ST (Time before Sleep) Command
<Sleep Mode (Low Power)> ST Command sets
the period of time (in tenths of seconds) in which
the modem remains inactive before entering into
Sleep Mode. For example, if the ST Parameter is
set to 0x64 (100 decimal), the modem will enter
into Sleep mode after 10 seconds of inactivity (no
transmitting or receiving). This command can
only be used if Cyclic Sleep or Serial Port Sleep
Mode settings have been selected using SM
(Sleep Mode) Command.
AT Command: ATST
Binary Command: 0x02
Parameter Range: 0x10 – 0xFFFF
[x
100
milliseconds]
Default Parameter Value: 0x64 (100 decimal)
Number of bytes returned: 2
Related Commands: SM (Sleep Mode), LH
(Wake-up Initializer Timer), HT (Time before
Wake-up Initializer)
SY (Time before Initialization) Command
<Networking> SY Command keeps a
communication channel open as long as modem
transmits or receives before the active connection
expires. It can be used to reduce latency in a
query/response sequence and should be set 100
ms longer than the delay between transmissions.
AT Command: ATSY
Binary Command: 0x17 (23 decimal)
Parameter Range: 0 – 0xFF
This command allows multiple XStream Modems
to share a hopping channel for a given amount of
time after receiving data. By default, all packets
include an RF initializer that contains channel
information used to synchronize any listening receivers to the transmitter’s hopping pattern.
Once a new modem comes within range or is powered on within range, it is able to instantly
synchronize to the transmitter and start receiving data. If no new modems are introduced into
the system, the synchronization information becomes redundant once modems have become
synchronized.
[x
100
milliseconds]
Default Parameter Value: 0 (Disabled - channel
initialization information is sent with each RF
packet.)
Number of bytes returned: 1