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Jan Axelson explains handshaking (from her book Serial Port Complete, 2nd edition) With flow control, a transmitting computer can indicate when it has data to send, and a receiving computer can indicate when it’s ready to receive data. The computers in a serial link should use flow control...

Wikipedia has a pretty good explanation of handshaking. The complexities of communication over telephone lines through modems (recognizing a dial tone, ring indicator, carrier detect, dialing, hook pick-up) and the limitations on buffer size in an era of costly memory is why handshaking...

> open and close a telescopic valve .to avoid this trip we removed 2 fixed plates .and working fine but the auma stop at 5.7 mA I have no idea what removing plates means. Remove what plates? sketch or photo of what the plates are? What does it means to "avoid this trip". What was...

55 pages of troubleshooting from the folks who license Ethernet/IP: https://literature.rockwellautomation.com/idc/groups/literature/documents/at/enet-at003_-en-p.pdf

There's about 50 things that can be wrong. I can't find the Max 50 on the English version of the web site (one has to know all the product categories, which I don't, and I can't find a search function.) So, here's some RS-485 issues that are commonly encountered: 1. Without seeing the...

Thanks for the update.

Check the manual and spec again. The spec sheet for the 2204E says that it has "Universal Inputs" including milliamp input. The conventional understanding of the term "Universal Inputs" is that one input type from the many available input types is selected in the configuration and the...

Probably like any VFD controlled pump application. Matching the transmitter output signal to what the drive's process variable input needs, 2-wire or 3-wire technology, power supply compatability, process connection, environmental rating, electrical connection style, pressure range, materials...

I'll speculate that if the failure is the electronics card with the 4-20mA/HART, Profibus or Foundation Fieldbus communications, then I'd guess that near lightning strikes take out the electronics due to long cable runs' ability to pickup induced voltage from the lightning. But it's speculation.

Udshread recalls the minimum spec properly: 10Vdc at the terminals, as confirmed by the Rosemount DVC6200 spec sheet: https://www.emerson.com/documents/automation/Product-Bulletin-FIELDVUE-DVC6200-Digital-Valve-Controller-en-123336.pdf

For decades, clamp-on ultrasonic was the domain of several major players, but some break through in technology brought dozens of secondary players to the market in the early-mid 2000's. They all do it their own way. This sounds like one way of doing "fault" condition. The negative -999999...

As I read your assessment, it appears that the DVC works independently (outside of) the bad-boy loop, right? I'm not sure what your 6.3Vdc reading is, or why the - to ground Ohms-out at 92K ohms, but you seem to be OK with that. So what non-run-of-the-mill thing is going on? I/S barrier? I am...

in-line sensors or clamp-on sensors? Transit time or doppler technology? What does "huge" mean? What's an example of normal vs "huge" flow? Negative means reverse flow. Do you only see 'negative flow' when the system is not running and is supposed to be turned off?

RTD’s use copper conductors, so any cable with copper conductors of the same gauge/size is suitable.

RS-485 According to Wikipedia, the RS- was replace by EIA-, which has since been replaced by TIA-. So your search term has to be EIA-485 standard. Standards are sold by vendors, usually as pdf or paper, your choice. You can buy the TIA-EIA-485 spec here...

Here's the first hit from a Google search - someone offering a Procontic software download. I have no idea whether the download is legitimate or riddled with viruses. https://plc4me.com/download-abb-procontic-programing-software/

Well, I learned two things today - GE grounds the lead wire compensation sense conductor on a 3-wire RTD and the element sense cables are twisted pair, not triads. Gee Golly Whiz, it is a big wide world out there. Obviously it works when wired properly and has for decades; it just isn't...

An RTD circuit works because the AI card pumps a constant current through the floating, ungrounded resistance of the RTD and then measures the voltage drop (Ohms Law) across the RTD resistance. No wire in a 2-wire, 3-wire or 4-wire RTD sensing circuit is grounded. Ever. The shield (or...

Check out Dust Collection solenoid valves, high Cv, electrically operated. 0 https://www.lesman.com/asco-valve-8353-two-way-dust-collector-main-pulse-solenoid-valves

Register addressing using the leading numeral 4, as in (4)0070 are assumed to be one-based decimal addresses, starting at (4)0001 [5 digit addressing] or (4)00001 [6 digit addressing]. The leading numeral, (4) in this case, is for human beings to recognize that the register is a Holding...