Intercept ASCII communication between two RS232 devices
The setup is based on two RS232-to-TTL converters connected to each other. The RX pin from one is connected to TX pin from the other.
Two RS232 devices, a master (eg. a computer running a software) and a slave (eg. a robot) are connected together with this setup placed in between.
The Arduino (it requires two extra serial ports, eg. a Mega 2560) reads the RX pins from both devices and prints the output to the Serial monitor.
This is useful to debug or reverse-engineer the command set necessary to drive RS232 devices, for instance.
Example output on serial monitor:
S1: SERIAL?
S2: 6571108
S1: CALDATE?
S2: 12/12/19
S1: WAVELENGTH?
S2: 660
S1: SOFTVER?
S2: MPC-B-4.0.1
S1: POWER?
S2: 0004mW
S1: SETCURRENT1?
S2: 054.8%
Note that for fast baud rates, the chronological order of the intercepted data may not be preserved accurately
