User manual

17
Switching off GPIO3 at#gpio=3,0,1
These LEDs can be controlled e.g. by an external microcontroller via at-commands issued to the
terminal via the serial RS232 interface. They can be used for signalling any useful status of the external
application such as:
 error indication
 status of communication (GPRS, SMS, CSD, etc.)
 status of GSM-network (to simulate GSM LED)
 quality of service
Safety and Product Care
Please read the information in this section and the information in “Installation of the Modem”, before
starting your integration work!
3.5 Safety instructions
PLEASE READ THESE SAFETY INSTRUCTIONS AND KEEP A COPY OF THEM.
 Always ensure that use of the modem is permitted. The modem may present a hazard if used in proximity
to personal medical electronic devices. As a rule, the modem must not be used in hospitals, airports or
planes.
 Never use the modem at a gas station, refuelling point, blasting area or in any other environment where
explosives may be present.
 Operating the modem close to other electronic devices, such as antennas, television sets, and radios may
cause electromagnetic interference.
 This product is intended to be used with the antenna or other radiating element at least 20cm away from
any part of the human body. In applications where this rule cannot be applied, the application designer is
responsible for providing the SAR measurement test report and declaration.
 You are responsible for observing your country's safety standards, and where applicable, the relevant
wiring rules.
3.6 General precautions
The HT910 E Terminal as a standalone item is designed for indoor use only. To use outside it must be
integrated into a weatherproof enclosure. Do not exceed the environmental and electrical limits as
specified in “Technical Data”.
 Avoid exposing the modem to lighted cigarettes, naked flames or to extreme hot or cold temperature.
 Never try to dismantle the modem yourself. There are no components inside the modem that can be
serviced by the user. If you attempt to dismantle the modem, you may invalidate the warranty.
 The HT910 E Terminal must not be installed or located where the surface temperature of the plastic case
may exceed 85°C.
 All cables connected to the HT910 E Terminal must be secured or clamped, immediately adjacent to the
modem's connectors, to provide strain relief and to avoid transmitting excessive vibration to the modem
in the installation.
 Ensure the cables, supplying power, audio headset, and input cable to the HT910 E Terminal, does not
exceed 3 metres.
 To protect power supply cables and meet the fire safety requirements when the unit is powered from a
battery or a high current supply, connect a fast 1.25A fuse in line with the positive supply.
 Do not connect any incompatible component or product to the HT910 E Terminal.