liupengjian
New Member
Hi, Everyone.
I encountered a problem in my project which needs to use MCU 18F452 to send SMS via Siemens modem MC35i, the MC35i is a chipset engine only, so I interface RX and TX directly to my 18F452 RX and TX pin. After power up and activate MC35i by Ignition pin (IGT). However after I sent some basic AT command, the modem chip just stay silenctly without any response.
I checked the datasheet but cannot get any clue.
Thanks for any advice from you.
(The attached is the block diagram for MC35i engine)
I encountered a problem in my project which needs to use MCU 18F452 to send SMS via Siemens modem MC35i, the MC35i is a chipset engine only, so I interface RX and TX directly to my 18F452 RX and TX pin. After power up and activate MC35i by Ignition pin (IGT). However after I sent some basic AT command, the modem chip just stay silenctly without any response.
I checked the datasheet but cannot get any clue.
Thanks for any advice from you.
(The attached is the block diagram for MC35i engine)