This RS232 shield is designed for the Arduino controller,and it can
easily convert UART to RS232 interface. The shield integrates DB9
connectors (female) that provide connection to various devices with
RS232 interface. Also the RS232 headers will facilitate your connections
and commissioning. It provides the welding areas to make full use of
extra space on it, which is highly convenient for prototyping. It
provides a run / program mode switch. When switched OFF, you'll be able
to programme the Arduino controller; When switched ON, you can use the
shield normally. Gold immersion PCB. Long pins on the back that are
compatible with most Arduino controllers.
As an alternative of RS232, RS485 provides more reliable way to transfer data at a longer distance.
RS232 DB9 Pinout Diagram
RS-232 Maximum Cable Length
The maximum cable length for
RS-232 is 50ft, but in practise depends on baud rate, cable specific
capacitance and ambient noise. The table below contains some
rules-of-thumb from experiments done by Texas Instruments years ago.
||Maximum range / cable length
What is RS232?
"In telecommunications, RS-232 is a standard for serial
communication transmission of data. It formally defines the signals
connecting between a DTE (data terminal equipment) such as a computer
terminal, and a DCE (data circuit-terminating equipment or data
communication equipment), such as a modem. The RS-232 standard is
commonly used in computer serial ports. The standard defines the
electrical characteristics and timing of signals, the meaning of
signals, and the physical size and pinout of connectors.