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Manual Documentation Number: ZPXXx-XXXXx-XR-0812
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 –
www.bb-elec.com
B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 –
www.bb-europe.com
HT (Time before Wake-up
Initializer) Command
<Sleep (Low Power)> If any
modules within range are
running in a “Cyclic Sleep”
setting, a wake-up initializer
must be used by the
transmitting module for sleeping
modules to remain awake [refer
to the LH (“Wake-up Initializer
Timer”) Command]. When a
receiving module in Cyclic Sleep
wakes, it must detect the
wake-up initializer in order to remain awake and receive data. The value of HT
Parameter tells the transmitter, “After a period of inactivity (no transmitting or
receiving) lasting HT amount of time, send a long wake-
up initializer”. HT
Parameter should be set to match the inactivity timeout [specified by ST (Time before
Sleep) Command] used by the receiver(s).
From the receiving module perspective, after HT time elapses and the inactivity
timeout (ST command) is met, the receiver goes into cyclic sleep. In cyclic sleep, the
receiver wakes once per sleep interval to check for a wake-up initializer. When a
wake-up initializer is detected, the module will stay awake to receive data. The wake-
up initializer must be longer than the cyclic sleep interval to ensure that sleeping
modules detect incoming data. When HT time elapses, the transmitter then knows
that it needs to send a long Wake-up Initializer for all receivers to be able to remain
awake and receive the next transmission. Matching HT to the time specified by ST on
the receiving module guarantees that all receivers will detect the next transmission.
ID (Modem VID) Command
<Networking & Security>
Set/Read the VID (Vendor
Identification Number). Only
modules with matching VIDs
can communicate with each
other. Modules with non-
matching VIDs will not receive
unintended data transmission.
AT Command: ATHT
Binary Command: 0x03 (3 decimal)
Parameter Range:
0
– 0xFFFF
[x 100 milliseconds]
Default Parameter Value: 0xFFFF (means that
long wake-up initializer will not be sent)
Number of bytes returned: 2
Related Commands: LH (Wake-up Initializer
Timer), SM (Sleep Mode), ST (Time before
Sleep)
AT Command: ATID
Binary Command: 0x27 (39 decimal)
Parameter Range (user-settable):
0x10 - 0x7FFFF
(Factory-set and read-only):
0x8000
– 0xFFFF
Number of bytes returned: 2
Minimum Firmware Version Required: 4.2B
(previous firmware versions did not support user-
settable IDs.)
