cleaningOut - I took your suggestion and plugged it an Arduino Uno while the oven controller was running, set the com port and I assume I established some form of communication because the controller displayed the message that the controller documentation said it would i.e.
# PCBP-Reflow Controller
# Software Date : Apr 17 2006
# Software Time : 12:20:16
# start selftest
# selftest ready
Type “help” for command list.
however when I typed help then enter nothing came back from the controller. The manual for the controller says to set these parameters -
9600 Baud, 8-bit, NO parity, 1 stop bit, no handshake
But all I can see to set in the Arduino serial port is the baud rate which I did to 9600. Might you be able to suggest what I may be doing wrong and how is it possible to set the other parameters requiredhttps://www.eevblog.com/forum/Themes/default/images/bbc/img.gif for serial communication.
Thanks Pedro
EDIT - Thanks so much cleaningOut I got the Arduino communicating (well I think I did)