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Microcontroller › 8051 › Interfacing GSM modem with 80s52
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
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.