Manual of Board ET-BASE GSM SIM900
•
DTR(Data Terminal Ready)
of Module SIM900 is Input from SIM900;
normally, it is interfaced with DTR of the device on the Host
side.
•
RTS(Request To Send)
of Module SIM900 is Input from SIM900;
normally, it is interfaced with RTS of the device on the Host
side.
•
CTS(Clear To Send)
of Module SIM900 is Output from SIM900;
normally, it is interfaced with CTS of the device on the Host
side.
•
RI(Ring Indicator)
of Module SIM900 is Output from SIM900;
normally, it is interfaced with RI of the device on the Host
side.
•
GND
of Module SIM900 must be interfaced with GND of the device
on the Host side.
It illustrates how to interface Signals between ET-BASE GSM SIM900
and Microcontroller.
SIM900
Signal Direction
MCU
DCD
DCD
TXD
RXD
RXD
TXD
DTR
DTR
RTS
RTS
CTS
CTS
RI
RI
GND
___
GND
Table shows the full connection.
SIM900
Signal Direction
MCU
TXD
RXD
RXD
TXD
GND
___
GND
Table shows the connection by 3 Cables.
NOTE
: In case of using 3 Cables for connection (RXD, TXD,
GND), it has to setup the condition of Flow Control for Module
SIM900 as
No flow control
by using the Command
“AT+IFC=0,0”,
or
XON/XOFF
by using the Command
“AT+IFC=1,1”
.
ETT CO., LTD.
-
8
-
www.etteam.com