adccommunitymod (AutomationDirect) asked a question.
Signet pH/flow probes and S3L
Created Date: October 24,2016
Created By: Frontier
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Has anyone figured out how to talk to Signet S3L sensors over RS232? According to their manuals, it's a serial ASCII format, so I'd imagine a PLC would be able to communicate if it had the right strings to request data...
Created Date: October 24,2016
Created by: Frontier
Has anyone figured out how to talk to Signet S3L sensors over RS232? According to their manuals, it's a serial ASCII format, so I'd imagine a PLC would be able to communicate if it had the right strings to request data...
Created Date: October 25,2016
Created by: plcnut
I have not tried to talk to anything from Signet.
The Do-more has successfully talked to all the ASCII devices that I have tried so far.
Created Date: October 26,2016
Created by: Frontier
Yeah, I definitely wasn't concerned about any limitation of the Do-More, of course! Just interested in hearing from people out there.
Created Date: April 07,2017
Created by: dd33
Sorry to revive an old thread but did you ever make any progress communicating with the Signet devices via S3L?
Created Date: April 12,2017
Created by: Frontier
I hadn't had the time, but I'm planning on working on it tonight. I'll post my results.
Created Date: April 13,2017
Created by: dd33
Let me know how it goes.
I just noticed this product on the GFPS website, if we can't get these sensors talking directly to a PLC this may work.
http://www.gfps.com/country_US/en_US/products/sensors/communication-protocol/0486.html
Created Date: April 16,2017
Created by: Frontier
...and I'm the worst. I worked so late I completely forgot about it. I'm going to start this now.
Created Date: April 19,2017
Created by: Frontier
Okay, a few days late, but here's what I found:
The S3L protocol is TTL-level single-wire bus. The sensors are powered by 5VDC, and the data line is referenced to ground. It communicates at 9600 bps, with 7 data bits, no parity, 1 stop bit, and no flow control.
I'm able to snoop on the traffic between a Signet display using an Arduino as a TTL converter. I 've identified a few things about the data stream, and can reliably pull data from it into a Do-More simulator (even scaling to an analog output), but any attempt to talk back to the sensor fails. Additionally, the sensor doesn't send any data without a request from the display (which I don't seem able to replicate).
I'm too far in to stop now. I'll keep you posted.
Created Date: May 10,2017
Created by: Frontier
Sorry everyone. I got bogged down with a bunch of projects. I'll get back to working on this in a couple of weeks.
Created Date: February 23,2020
Created by: mencomputer
ayuda protocolo s3l de signet