Cep Terminals GPRS-TERMINAL GT864 PY 6002 数据表
产品代码
6002
CEP AG
Revision 1.3
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many milliseconds) or very small transitions (e.g. only few volts instead of 0V to VCC)
will not turn on the module (since they are not considered to be a “positive edge”).
Although this will not be an issue in almost all typical applications of the modem,
please consider following points:
will not turn on the module (since they are not considered to be a “positive edge”).
Although this will not be an issue in almost all typical applications of the modem,
please consider following points:
• Large capacitors in your power supply which will lead to slow leading and
falling edges (issue does not apply with modern stabilized switching regulator
power-adaptors) AND TO_IN tied in parallel to VCC (instead of separate
dedicated digital signal)
power-adaptors) AND TO_IN tied in parallel to VCC (instead of separate
dedicated digital signal)
• Slow analogue signals used to assert TO_IN
• TO_IN signal not before VCC
• TO_IN signal not before VCC
All 3 cases above might prevent the modem from recognizing the power-up signal
this is no failure of the modem itself, the same would apply to almost any electronic
device that provides a separate “power-on” or “reset” signal.
If you are doubt, please
• Use the mains power adapter that is provided by your distributor and is know
to work properly with your modem
• Make sure that your signal and system design is according to the above
• Consult our support team that will be more than happy to assist you.
• Consult our support team that will be more than happy to assist you.
3.2 Switching OFF the modem
There are two ways to switch off (power down) the modem as described below:
• use the AT#SHDN command; DTR permanently to low (0,8V)
• HR_IN to high level for 1s < t < 2s
A delay of up to 10s is experienced as the modem logs off the network
• HR_IN to high level for 1s < t < 2s
A delay of up to 10s is experienced as the modem logs off the network
3.3 Operating states / LEDs
3.3.1 Power up LED (green LED in the middle)
The modem has a green power up LED, as depicted below, which is used to indicate
various operating states. These states are described in following table.
Operating state of GT864-QUAD/PY Terminal
Power up LED state
Device off
Permanently off
net search / not registered /
Fast blinking (period=1s,
LED
LED
on
=0,5s
registered full service
Slow blinking (period=3s,
LED
LED
on
=0,3s
A call is active
Permanently on