As said, the pin direction in your post #1 table corresponds to the modem and PC standard. The signal naming is however partly different, it depends if the signal function is seen from the DCE or DTE side. Respectively the data output may be either designated RxD or TxD. same with RTS/CTS and DTR/DSR.As the following picture, for DCE, DTR is "In", which is different from the post#1 definition.
So I don't know which is right?
No. According to the standard, a bipolar level of at least +/- 3V is required for RS-232, clearly distinguished from logic level UART interfaces. Also RS-232 level is inverted compared to UART level.Also remember that the original standards state +12 and -12V but in most modern systems we use logic levels.
Is it using AT command to set 0/1 for each line, such as RTS/CTS?,
I used 9pin female connector DSR as RS232 enable signal. Pls check the picture.
I can't do the flow control with the design.
I guess maybe I connect all the pins of 9pin connector. If I break other pins except TXD/RXD/RTS/CTS/GND
, that is what I am doing now, that is DSR for my design, my terminal is DCE.You can use DTR from the DTE
Hi, bking,
You said, , that is what I am doing now, that is DSR for my design, my terminal is DCE.
Pls check what I said in the previous posts before you make a comment. Many thanks.
Best,
tony Liu
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