Please tell me how to reply by SMS for a received SMS

[hjcool]

My problem is this. I need to send SMS with data from a weighing scale to a given number when a SMS is received by the GSM modem. SMS sending part and data reading from the weighing scale part is ok but responding to SMS is not working in my program.
Can anyone tell me how to send SMS to a given number when SMS is received to the GSM modem. My program is as follows.

include "modedefs.bas"

define OSC 4
DEFINE HSER_SPBRG 25
DEFINE HSER_TXSTA 24h
DEFINE HSER_RCSTA 90h
DEFINE HSER_BAUD 9600
DEFINE HSER_CLROERR 1

comRs232Out var PORTD.0
comRs232in var PORTD.1
weightGet var word
smsGet var word

Initialize:

Start:
HIGH smsRead
HSEROUT ["AT+CMGF=1",13]
PAUSE 500
HSEROUT ["AT+CMGR=1",13]
PAUSE 500
HSERIN [smsGet]
PAUSE 500

IF smsGet = " " THEN
goto Start
ELSE
SERIN comRs232In, T2400, [weightGet]
PAUSE 500
HSEROUT ["AT+CMGS=",34,"0718116393",34,13]
PAUSE 500
HSEROUT [weightGet,26]
PAUSE 500
HSEROUT ["AT+CMGL=1,4",26]
PAUSE 15000
goto Start
ENDIF

[aratti]

but responding to SMS is not working in my program.

This is quite simple providing that your modem is capable to hand text format (if you have only PDU format then you need to convert text to PDU first)

AT+CMGS=+39xxxxxxxxxxxx,13

where +39 = international prefix for Italy (you will change as needed)
xxxxxxxxxxxx = phone number you will send the sms.

Immediatly after having sent this AT command you go listening the modem :

answer should be: ">"

When you receive this character then you sent your text (max 160 chars) terminating with 26

HSEROUT ["This is my test",26] and you have sent your message.

If you don't receive ">" within 5 seconds you must abort the command sending: HSEROUT [27] and repeat the command.

Hope it will help you.

Al.

[hjcool]

Thank You im now testing it

This is quite simple providing that your modem is capable to hand text format (if you have only PDU format then you need to convert text to PDU first)

AT+CMGS=+39xxxxxxxxxxxx,13

where +39 = international prefix for Italy (you will change as needed)
xxxxxxxxxxxx = phone number you will send the sms.

Immediatly after having sent this AT command you go listening the modem :

answer should be: ">"

When you receive this character then you sent your text (max 160 chars) terminating with 26

HSEROUT ["This is my test",26] and you have sent your message.

If you don't receive ">" within 5 seconds you must abort the command sending: HSEROUT [27] and repeat the command.

Hope it will help you.

Al.

[hjcool]

I just need to know how to repply when a message received by the GSM Modam. It is great if i can repply only to a message from a specific number

[aratti]

If you want to answer to a received sms, then decode the message and grab the number of the sender, use it to reply with the same method as per previuos post.

Al.

[hjcool]

I have another problem in reading sms to a variable. Can u please let me know the code sequence to read sms in to a variable. (I am just a beginner to PIC programming). I know how to send AT command to read SMS but my problem is in getting Modem responces in to a variable.