kluivert
Junior Member level 2
max232 with hand shaking
Hi all
I am doing a project on car security system based on gsm which is S35 siemens, finally i managed to write code on uC and send bytes by uart but the phone doesn't give any response like when connected to PC(HyperTerminal)
My friend told me it must be a Handshaking problem, i am using uC connected to MAX232 then to the mobile data cable
My Qns:
1- I read +9V for 0 and -9v for 1 on pins T1 & R1 , why ? as it should be 3.3 V EIA/232 ?
2- I am very confused with the mobile handshaking, How it's connected? what about R
TS-CTS& DTR-DSR ?
3- Do the max232 is connected directly to mobile pins directly or must use as sw
plzzz help
Thanks in ad
Hi all
I am doing a project on car security system based on gsm which is S35 siemens, finally i managed to write code on uC and send bytes by uart but the phone doesn't give any response like when connected to PC(HyperTerminal)
My friend told me it must be a Handshaking problem, i am using uC connected to MAX232 then to the mobile data cable
My Qns:
1- I read +9V for 0 and -9v for 1 on pins T1 & R1 , why ? as it should be 3.3 V EIA/232 ?
2- I am very confused with the mobile handshaking, How it's connected? what about R
TS-CTS& DTR-DSR ?
3- Do the max232 is connected directly to mobile pins directly or must use as sw
plzzz help
Thanks in ad