Hayes Microcomputer Products ASLH306 - Manual (Page 7)

ASL Holdings Limited 19/09/2005 7
Draft Copy Version 2c
of the modem issuing the “Goodbye” message then it will commence its
power up sequence and restart.
The battery powered modem will power up within 5 seconds after the
external supply is applied given that the battery and capacitors are fully
charged and that the modem is operating at room temperature. If the battery
and capacitors are not fully charged and/or the modem is not operating at
room temperature then the power up sequence will take longer.
Antennae.
The Delta Plus MOBILE II GSM/GPRS modem is designed to work with many
industry standard antennae. Connection to the antenna is via a flying lead
terminated with a SMA type co-axial connector. The selection of the most
suitable antenna in any given installation will be dependent upon factors such
as the distance from the cell site, signal strength, power supply levels, and
other physical constraints. ASLH Ltd. will be pleased to assist customers with
the selection of suitable antennae.
Subscriber Identity Module card.
This product requires a suitable Subscriber Identity Module (SIM) card
inserted in the right hand side of the modem. The SIM card is provided by the
network service provider eg. O2, Vodafone, Orange etc. This card must be
data enabled, ie. a voice only SIM will not work. Additionally, if the product is
to be used for GPRS applications then the SIM card must be GPRS enabled.
This mode will be set as either mobile originate or terminate (IP listen)
depending upon the users requirements.
ASLH Ltd. is able to provide network service supplied by the aforementioned
companies.
Configuring the modem
This is achieved by the use of the standard Hayes(™) AT command set as
utilised in conventional land line modems. A comprehensive list of AT
commands used by the Delta Plus MOBILE II GSM/GPRS modem follows.
AT Command set
AT+ commands should be used alone, not concatenated ie AT+Y<cr>
not AT+YS0=1<cr> etc).
AT A
Answer mode enable