Hi, I am interfacing 8051 with SIM300CZ. SIM300CZ has serial interface through which 8051 gets connected and sends AT commands. SIMCOM's serial interface works on TTL logic and 8051 also works on TTL logic so not using level converter. I need the details of handshaking signals required to write my program for 8051. I need the voltage level details for DCD, DTR, RTS, CTS, RI pins so that I can use GPIO pins of 8051 for handshaking.
Please elaborate the serial handshaking pattern so that I can write my code for handshaking accordingly.
Fast response is required & appreciated.
Rgds Sam
Hi, Well, SIM300CZ datasheet does not provide any details for handshaking or the voltage level details. Can you provide me the sequence in which the handshaking signals(DTR, RTS, DCD, RI, CTS, etc) works so that I can follow the same and implement in 8051 using the GPIO pins.
Sam
What do you think a normal modem does with the handshake signals? They are not specific to a particular chip. There are tons of information out there about these signals. That is probably also why the datasheet doesn't spend time on describing the signals.
If the chip uses TTL levels for the signals, then the datasheet probably do contain information about the voltage levels. It's just that they don't explicitly mentions these signals but describe the general voltage levels for all digital inputs and outputs.
Provide me the sequence of these signals and I can make the thing run.
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