Manual of Board ET-BASE GSM SIM900
LED Status
Power-ON
Power-OFF
VBAT (GREEN)
ON
ON
NET(ORANGE)
FLASH
OFF
STAT(GREEN)
ON
OFF
Table shows status of LED in various modes.
4.2 Control On/OFF by Pin PWRKEY:
It enables/disables the
operation of this Module by external signal such as signal
from Microcontroller; it is connected through Pin
PWRKEY
(Connector P4 or P5). It runs in the format of Toggle; if the
Module is in the status of Power OFF and it sends Logic “1”
more than 1000mS (1 second) and then it becomes Logic “0”, it
commands the Module to return the status of Power ON that is
ready to run. Or, if the Module is in the status of Power ON
and it sends Logic “1” more than 1000mS (1 second) and then it
becomes Logic “0”, it commands the Module to stop running and
return to the status of Power OFF (stop running).
4.3 Auto ON/OFF
: It auto enables the operation of Module SIM900
immediately after supplied power into Board ET-BASE GSM SIM900
completely; in this case, it has to set Jumper
JP1
to the
position of
AT
.
5. How to communicate with Module SIM900
There are 2 types to communicate with Board ET-BASE GSM SIM900.
Firstly, it is connected through RS232 Serial Port by Connector 4PIN
that is arranged according to ETT Standard; it can be connected with
standard Signal RS232 such as computer RS232 (Com Port) or ETT Board
Microcontroller that is Connector RS232 4PIN instantly. Secondly,
this Board ET-BASE GSM SIM900 provides Connector TTL 3-5V (P4 or P5)
to interface with Board Microcontroller directly, without using any
Circuit to convert the signal level to be RS232. Signals that are
used to serially connect with Module SIM900 are listed as follows;
•
DCD(Data Carrier Detect)
of Module SIM900 is Output from
SIM900; normally, it is interfaced with DCD Input of the device
on the Host side.
•
TXD(Transmit Data)
of Module SIM900 is Output from SIM900;
normally, it is interfaced with RXD(Receive Data) of the device
on the Host side.
•
RXD(Receive Data)
of Module SIM900 is Input from SIM900;
normally, it is interfaced with TXD(Transmit Data) of the
device on the Host side.
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