Discussion in "Embedded GSM Development" started by    Tamizh    Jan 13, 2009.
Tue Jan 13 2009, 04:50 pm
#1
hi guys, I m going to interface GSM Modem with AT89C52 through RS 232 . The modem uses handshaking signals. But i have no idea on handshaking signals. i have used only TXD & RXD pins of AT89C52 for RS- 232 communications. plz help me..
Tue Jan 13 2009, 07:49 pm
#2
Which modem,Tamizh?
Any link/datasheet?
Wed Jan 14 2009, 10:55 am
#3
hi...

as shashijoseph asked, which modem are you using? and first of all check with the AT commands on the hyperterminal and see if your modem is communicating with the AT commands.
check the forum also coz i guess there have been queries before also on the GSM. Maybe those will help you out.

regards,
shweta1
Fri Jan 16 2009, 11:49 am
#4
I am using ANALOGIC (GSM/GPRS Smart Modem)..I checked out with the AT commands on the hyperterminal and it works well...plz help me... thanks for reply..
Fri Jan 16 2009, 11:13 pm
#5
The analogic modem consists 2nd pin as Tx and 3rd pin as Rx at its female DB9 connector. So be careful with its connection's.
Sat Jan 17 2009, 02:31 am
#6


hi guys, I m going to interface GSM Modem with AT89C52 through RS 232 . The modem uses handshaking signals. But i have no idea on handshaking signals. i have used only TXD & RXD pins of AT89C52 for RS- 232 communications. plz help me..

Tamizh



Generally handshaking signals can be ignored as long as the AT89C52 or PC can
read the data from the modem fast enough (which it normally can).
They are there to allow either device to tell the sender to slow down.

Ideally the handshaking inputs to the modem would be fixed to the 'OK' levels,
but I can't remember what they are, so wouldn't bother

As your modem works in Hyperterminal it is already ignoring handshaking so
just use TX and RX.


[ Edited Sat Jan 17 2009, 02:35 am ]
Sat Jan 24 2009, 01:36 pm
#7
hi.. My gsm modem works fine with AT89C52 without handshaking signals.....Thanks for all...

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