GE863-QUAD / PY Software User Guide

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GE863-QUAD / PY Software User Guide 1vv0300746 Rev. 1 - 23/10/06 2.4.1.3 Hardware Unconditional Restart To unconditionally restart the GE863-QUAD / PY the pin RESET# must be tied low for at least 200 milliseconds and then released. With this command the module will switch off itself and then it will switch on again. A simple circuit to do it is: Unconditional Restart impulse NOTE: don't use any pull up resistor on the RESET# line nor any totem pole digital output. Using pull up resistor may bring to latch up problems on the GE863-QUAD / PY power regulator and improper functioning of the module. The line RESET# must be connected only in open collector configuration. TIP: The unconditional hardware RESTART should be always implemented on the boards and software should use it as an emergency exit procedure. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 14 of 117
GE863-QUAD / PY Software User Guide 1vv0300746 Rev. 1 - 23/10/06 2.5 Checking GSM device functionality After a proper power on the device is ready to receive AT commands on the serial port. Several things have to be checked in order to be sure that the device is ready to send and receive calls and SMS: 2.5.1 Autobauding At startup it is necessary to send an AT command to make the device set the right speed and character format of the serial port. When this is done the device responds with OK. If no response is received within the timeout period of 200 ms retry. • Send command AT • wait for OK response after this initial command, it is advisable to fix the port rate, in order to eliminate possible errors in detecting the serial speed rate: • Send command AT+IPR= • wait for OK response where rate is the port speed and can be 0, 300,1200,2400,4800,9600,19200,38400,57600,115200 bps. If is set to 0, then automatic speed detection is enabled and also character format (see +ICF) is set to auto-detect. (default) If is specified and not 0, DTE-DCE speed is fixed at that speed, hence no speed auto-detection (autobauding) is enabled. TIP: The serial port suggested setting is: port speed 38400, character format 8N1 (8 bit per char, No parity bit, 1 stop bit). Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 15 of 117
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4.1.1 CSD application example GE863
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