http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. Thu, 04 Dec 2008 15:48:52 -0800 http://backend.userland.com/rss092 i m using a maestro modem which supports both text and PDU mode. and i m interfacing it with PIC 917.i m able to send AT-commands using hyperterminal <noauthor@nospam.com> http://www.8051projects.net/forum-t8303.html u r using putc ?????is it meant to send char or string please check and reply!!! shyam<shyam@nospam.com> http://www.8051projects.net/forum-t8303.html i m displaying the output on LCD, for that i have written a code.....which u can see in the attachment.....plz tell me where i m wrong.....one more th monika<monika_23sep@nospam.com> http://www.8051projects.net/forum-t8303.html first do check what shyam said.There are few mistakes you might missed out. There is only carriage return while sending at command. So you don't need Ajay<contact@nospam.com> http://www.8051projects.net/forum-t8303.html i already did that. i compiled my code without /n. but result was same. No response of AT-command is comming. and there is no space b/w at and /r.i ca monika<monika_23sep@nospam.com> http://www.8051projects.net/forum-t8303.html first of all please check if ur modem and controller can communicate properly..u have tested modem with the PC ...now test ur controler the same way shyam<shyam@nospam.com> http://www.8051projects.net/forum-t8303.html yes i have tested PIC with hyperterminal..and it is responding fine..problem arises when i interface modem with PIC.then there is no response on LCD.m monika<monika_23sep@nospam.com> http://www.8051projects.net/forum-t8303.html can anybody guide me what can can be the correct schematic for interfacing GSM modem with PIC microcontroller......i hv done the above mentioned conne monika<monika_23sep@nospam.com> http://www.8051projects.net/forum-t8303.html make DTR and RTS pin of DB9 connector on board high.. and then try sending at commands.. Ajay<contact@nospam.com> http://www.8051projects.net/forum-t8303.html does your maestro modem have a serial DB9 intervace or did it come with some special cable??? shyam<shyam@nospam.com> http://www.8051projects.net/forum-t8303.html Hi Monika, Could you give paste response of feve command asked?1) ATi32) AT+WOPEN=23)AT+WOPEN?Please also type ATE0 (it is ATEZERO) and then AT& Shailesh NAYAK<nayaktel@nospam.com> http://www.8051projects.net/forum-t8303.html yes my modem has DB9 connector.can you tell me what do you mean by making pins 4 and 7 high and what is the significance of it? monika<monika_23sep@nospam.com> http://www.8051projects.net/forum-t8303.html Making pins 4&7 high means just that......pull the pins high by connecting them to Vcc (preferably through 4.7k pullups).Pins 4 and 7 are used for sashijoseph<sashijoseph@nospam.com> http://www.8051projects.net/forum-t8303.html can you tell us your basic application?and are you using only PIC?you can also make use of OpenAT to program your modem.regarding AT+WOPEN:This specif Ajay<contact@nospam.com> http://www.8051projects.net/forum-t8303.html Shailesh NAYAK wrote ...Hi Monika, Could you give paste response of feve command asked?1) ATi32) AT+WOPEN=23)AT+WOPEN?Please also type ATE0 (it is A monika<monika_23sep@nospam.com> http://www.8051projects.net/forum-t8303.html the responses tell us the OS used i.e. 3.12and the firmware is 657cthese help in troubleshooting things!... shyam<shyam@nospam.com> http://www.8051projects.net/forum-t8303.html