OkiePC
Lifetime Supporting Member
A nitpick: the MicroLogix 1200 controller has only an RS-232 port. The "R" versions have a second RS-232 port.
The round Mini-Din8 style Channel 0 serial port on the MicroLogix 1000, 1200, and 1500 controllers has +24V on Pin 1 that can power up a handheld or network interface. You want to be very careful with any home-made cables to avoid connecting +24V to something that can't tolerate it.
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That's much more important than a nitpick! Thank you for bring your vast expertise to this topic. I had no idea the 1200 port was 232 only.