RS232/RS485 Shield for Arduino;

Descriptions: It is a RS232 shield and also a RS485 Shield for Arduino which can convert UART to RS232 or RS485 interface. The shield integrates DB9 connectors (female) that provide connection to various devices with RS232 interface and also provide a RS485 screw terminal interface. It provides the prototyping area to make full use of extra space on it, which is highly convenient for prototyping

How to use?
This shield provides 2 mode setting switches: UART/Soft serial settting switch and RS485/RS232 setting switch. When UART/Soft serial switched to Soft Serial, you can program the Arduino controller or communicate with soft serial; When switched UART, you can use the UART port.
Documents:
https://s3-us-west-2.amazonaws.com/arduinoshield/RS232485+shield.rar