RS-232

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What are the RS-232 and Transistor-Transistor-Logic (TTL) voltage level?

Voltage	RS-232	TTL
0	[+3V;+25V]	0V
1	[-3V ;-25V]	Vcc (usually 3.3V or 5V)

What is DCE and DTE?

DCE stands for Device Communications Equipment.

DTE stands for Device Terminal Equipment.

Signal	DCE	DTE
RX	out	in
TX	in	out
CTS	out	in
RTS	in	out

On the NXP i.MX6 the convention is a little different:

Signal	i.MX6 DCE	i.MX6 DTE
RX	in	out
TX	out	in
CTS	out	in
RTS	in	out

Bluetooth module, modems and GPS are generally DTE while computer are DCE.

Resources


Pin-out	http://www.db9-pinout.com/db9-pinout/db9-pinout.gif

References

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