On 2/17/23 13:02, Mark Rivers via Tech-talk wrote:
Folks,
I have solved the problem, and I can now program the SLC500 through the Moxa.
I enabled data logging on the Moxa and I saw that the received data from the PLC was identical to transmitted data to it. I then found that this was true even when the PLC was off! It was clearly a cable problem, as Mark K. suggested.
I misread the pinout of the RJ45 connector on the Moxa. Interestingly, although EIA-561 specifies the pinout for RS-232 on RJ45, I have yet to find a vendor who actually follows the EIA-561 standard. Moxa and ProSoft use a completely different pinout.
Fun right? I used to keep a printout of this table on my desk @nsls2.
It wasn't exhaustive then, so I'm certain it isn't now.
https://www.conserver.com/consoles/Signals/signals.html
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