gsm modem with 16f877a

[kumara]

dear friends
i want to interface M1206B gsm modem with pic 16f877a.modem with pc ok.i can send sms using hyperterminal.pc with pic ok i can display "at"
but pic and modem not suport.i have chang baundrate but donot work.i have find som post but i can't do it.please help me
thank you


' Initialization
TRISB=%00000000
PORTB=%00000000

'Definitions
DEFINE OSC 4
DEFINE HSER_TXSTA 20h
DEFINE HSER_RCSTA 90h
DEFINE HSER_BAUD 2400
DEFINE HSER_SPBRG 25

BEGIN:
PORTB = 0
HIGH PORTB.7
PAUSE 1000
LOW PORTB.7
HIGH PORTB.6
HSerout ["AT",13,10] 'TEST COMMUNICATION
HSERIN 5000,begin,[WAIT("OK")]
HIGH PORTB.5
PAUSE 500
GOTO begin

'END
End

[kumara]

any body help me..

[Ioannis]

1. Is your modem communicating with a PC at the specified speed? You seem to use 2400 baud rate...

2. Do the trick with a second serial port, two resistors (experiment from 10K down to 1K which ever works) to pick the Rx and Tx lines an monitor on a PC terminal. You will see if the commands are received and what the modem answers.

3. Post the results to check here.

Ioannis

[kumara]

1.it's works 2400 boundrate with pc.

2.i can't undertand this trick.

[Ioannis]

Modem PIC
Tx -----------X-----------------Rx
Rx ------X----|-----------------Tx
| |
1k 1k
| |
PC |----|
Rx-------X---X

Hope this helps you understand.

Ioannis

[kumara]

Mr Ioannis now i can send sms (i have 1 mistake rx and tx chang)but now i want to do read sms and high led.please help methank you

[Ioannis]

This example subroutine is for Wavecom. You have to check the manual of your GSM device for the correct commands.
Also this example supposes that the GSM device responds with ASCII characters and not with numbers. OK instead of 0 (zero).

GSM_Subroutine:
HSerout ["AT+CMGL=",34,"ALL",34,13] 'Check if there is new SMS. 34 is for " symbol
Hserin 5000,err,[wait(10,13,10),str command\2]
if command[0]="O" then return	'If response was just OK, then there was no SMS
if command[0]="+" then goto read_sms 'If response started with + sign then there was some sms

err:
return

read_sms:
Lcdout com,line1,"Reading SMS",rep " "\4
for l=0 to 5:command[l]=0:next l    'Clear buffer
GoSub Mobile_Number      'get mobile number from setup, to check correct admin number
HSerout ["AT+CMGL=",34,"ALL",34,13]  '"ALL" is for Wavecom module. Read all SMS 
' Read Caller ID etc. The timeout value in the HSERIN statement is important.
' it takes some time before the phone replies to the AT+CMGL command
HSerin 5000,ex_sms4,[wait("READ"),skip 4,waitstr command\10,skip 27,STR command\6\13] 'Number is waitstr command\10
LCDOut com,line1,"Read 1 SMS",rep " "\4,com,line2,"Command: ",str command\6

sms_delete:
HSerout ["AT+CMGD=1,4",13]			'Delete all messages
LCDOut com,line1,"Deleting SMS":pause 150
HSerin 15000,ex_sms2,[wait("OK")]     'Wait for OK (null)
LCDOut com,line1,"Deleted SMS ":Pause 1000
GoTo lcd_cls

ex_sms2:    'No new message or timeout error
LCDOut com,line2,"Error",rep " "\11:Pause 1000
GoTo sms_chk

ex_sms3:
LCDOut com,line2,"SMS Check Error":Pause 1000
GoTo sms_delete

ex_sms4:    'Wrong Number!
LCDOut com,line2,"Error phone Nbr":Pause 1000
GoTo sms_delete

I repeat again, study your GSM AT commands before attempting anything.
Ioannis

[kumara]

Mr.Ioannis

I HAVE FIND SOME CODE ABOUT AND I WROTE SOME CODE "AT+CMGD"
I SEND TO MODEM TO SMS "A" BUT NOT TURN ON PORTB.6

WHAT'S THE WRONG THIS CODE HELP ME
' Def
define OSC 4
DEFINE HSER_SPBRG 25
DEFINE HSER_TXSTA 20h
DEFINE HSER_RCSTA 90h
DEFINE HSER_BAUD 2400
DEFINE HSER_CLROERR 1

sms VAR BYTE[16]

I VAR BYTE

'Check sms

begin:
HIGH PORTB.7
HSerout ["AT",13,10]' start comm
HSERIN 2000,begin,[WAIT("OK")]
LOW PORTB.7


query:
HSEROUT["AT+CMGL=",34,"REC READ",34,13,10]' filter for query
HSERIN 5000,query,[WAIT("REC READ"),skip 41, STR sms\16\13]
HIGH PORTB.5
PAUSE 200
LOW PORTB.5
I=0

WHILE I <> 13' count until 13
if sms[i]=$44 THEN ' searching for letter A ?
GOTO turnon:
ELSE
GOTO back
I=I+1
ENDIF
WEND
turnon:
High PortB.6
pause 1000
HSerout ["AT+CMGD=1",13,10]
low portb.6
GOTO QUERY
back:
HIGH PORTB.4
HSerout ["AT+CMGD=1",13,10]
PAUSE 100
LOW PORTB.4
GOTO QUERY
END

xxxxx.

[Ioannis]

Are you sure the x y z modem that you have not study yet, is working at 2400 ?

I am sorry but cannot guess. Nor I have the magic ball to tell me what you have, how it must be set-up. It is your job to do it.

Ioannis

[starwick]

Hi,
First make sure you connect the pic rx and tx trough 10k resitor to the modem's rx and tx pin, Then you need to tie the handhaking pins together on the modem side.
Start with pin 7 and 8 tied together and see if u get some data if not then tie pins 4 AND 6.Most modems required handshaking by tieing these pins the modem will be always ready to send and receive other wise it will sit and wait. Good luck hope this will help.

[kumara]

my sms project

3 input and 3 out put

[kumara]

HI.
how to get tower infomation modem,anybody help me.
thank you
kumara

[kumara]

CHECK:
portb=%11110000
HSEROUT ["AT",13]
HSERIN 5000, ERR, [WAIT("OK")]
pause 200
PORTb=%00000000
HIGH PORTB.4
PAUSE 15000
HSEROUT ["at+cmgs=",34,"07xxxxxxxxx",34,13]
PAUSE 100
HSEROUT ["SYSTEM OK",26]
HSERIN 5000, ERR, [WAIT("OK")]
HSEROUT ["at+cmgs=",34,"0719099795",34,13]
PAUSE 100
HSEROUT ["SYSTEM OK",26]
HSERIN 5000, ERR, [WAIT("OK")]
low portb.4

'get initial status
PortDStatus.0 = PORTD.0
PortDStatus.1 = PORTD.1
PortDStatus.2 = PORTD.2
BEGIN:
HIGH PORTB.7
PAUSE 200
LOW PORTB.7
if PORTD.0 != PortDStatus.0 then 'sensed change in PORTD.0
pause 10 'debounce 10 ms
PortDStatus.0 = PORTD.0 'save new status for PORTD.0
if PORTD.0 = 1 then
gosub SEND_SMS0 'send new status report
else 'PORTD.0 = 0
gosub SEND_SMS2
endif
endif
if PORTD.1 != PortDStatus.1 then 'sensed change in PORTD.1
pause 10
PortDStatus.1 = PORTD.1 'save new status for PORTD.1
IF PORTD.1 = 1 then
gosub SEND_SMS1
else 'PORTD.1 = 0
gosub SEND_SMS3
endif
endif
if PORTD.2 != PortDStatus.2 then 'sensed change in PORTD.1
pause 10
PortDStatus.2 = PORTD.2 'save new status for PORTD.1
IF PORTD.2 = 1 then
gosub SEND_SMS4
else 'PORTD.1 = 0
gosub SEND_SMS5
endif
endif
PAUSE 10

[Hero000]

my sms project
Attachment 6608
3 input and 3 out put

kumara"" I'm highly interested about it, please tell me about its working formula, efficiency etc.