Interfacing GSM modem with 80s52

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This topic has 1 reply, 2 voices, and was last updated 13 years, 3 months ago by RUBEN KURIAKOSE.

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March 7, 2013 at 9:56 am #2168

prajwal
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hi,

I have a gsm modem named WISMO.

I tested the modem with PC and its working fine. When i tested with PC I DID NOT USE

MAX 232. Now i need to interface it to the controller should i use max232??

Pls help

April 13, 2013 at 10:33 am #9483

RUBEN KURIAKOSE
Participant

when ever you are trying to interface a TTL device with a CMOS use aMAX 232 between them since there requires a voltage change over.
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