Figure19: Connection Of Software Upgrade And Software Debug - SimCom SIM900D Hardware Design
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Also See for SIM900D:
- Command manual (8 pages) ,
- Hardware design (51 pages) ,
- User manual (20 pages)
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SIM900D Hardware Design
MODULE(DCE)
Figure19: Connection of software upgrade and software debug
The serial port and the debug port do not support the RS_232 level and it only supports the CMOS level. Please
refer to the table 12 for details about the voltage level. User should add the level converter IC between the DCE
and DTE, if user uses it with the computer. Please refer to the following figure.
DCD
TXD
CTS
RI
MODULE
RXD
DTR
RTS
SIM900D_Hardware Design_V1.04
DBG_TXD
DBG_RXD
GND
PWRKEY
Serial port
Figure20: RS232 level converter circuit
TXD
RXD
GND
PWRKEY
I/O Connector
39
2010.10.09
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