TL;DR
I made my own USB Local Access programming cable for the Automated Logic LGE, and you can too.
Local Access port pinout: 1 transmit, 2 receive, shell ground. Signaling is TTL.
Full Story
I needed to change the IP addresses on a couple Automated Logic LGEs at my facility, but couldn't find the pinout (or
any information, really) for the 8-pin mini-DIN Local Access port. I read through this thread and a couple others, and saw other people were looking for the pinout too, so I want to share what I learned, even though it's a very old post.
Based on what I read here, I had a hunch the signaling was TTL and not RS-485. I got a USB-TTL adapter from Allied Electronics (TTL-232R-5V) and a mini-DIN 8 cable to hack into a breakout. I plugged each into a breadboard with pin headers so I could use jumper wires to figure the pinout. The TTL cable appears as a virtual COM port in Windows, and I used SiteBuilder 6.1 with the baud rate set to 38400. I tried examining the LGE circuit board traces to deduce a pinout for the Local Access port, but nothing was obvious to me. In the absence of any other information, I guessed pin 1 for transmit, pin 2 for receive, the connector shell for signal ground, and.....that was it. That's the pinout. SiteBuilder loaded the module status without issue. I tried changing the IP address, and it too worked without issue. Success! I love when a plan comes together.
For all I know, this could be common knowledge to true HVAC professionals (of which I am not), but I at least wanted to post what I've learned in case it helps someone in the future looking for the same information I was.
Cheers,
C#2