This converter can be connected to an Arduino Serial pin (0,1) to convert standard Arduino ttl to

RS232. It allows arduino talk to hundreds of RS232 devices.

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.

Baud rate 

Maximum range / cable length 

19200 

50ft 

9600 

500ft 

4800 

1000ft