Brian H

Only three wires are used for the serial signals. No handshake connections on the Serial Port connector of the PLM. From the quick guide and Modem Developers Guide. 1 RS232 Out to PC Pin 2 (RX) 7 Common 8 RS232 In from PC Pin 3 (TX) Note Pin 3 is a TTL Level Output (from PLM) Pin 6 is a TTL Level Input. (to PLM) Not too sure how well they are protected from noise.

You may want to look at this thread here. I found some differences in the different hardware revisions of the I/O Linc. Maybe a hardware issue adding to the problem you are seeing. http://forum.universal-devices.com/topic/21417-io-linc-hardware-differences-between-revisions/

Maybe the original was discontinued. Smarthome does list a external power supply for the 2441ZTH and it looks different than the one I remember. http://www.smarthome.com/5v-dc-power-supply-insteon-wireless-thermostat.html

The Insteon Wireless Thermostat is not connected to the HVAC wiring. It uses Insteon RF linked to another Insteon Module. It is 2 AA Cell battery operated or there is an optional 5 volt DC wall wart made for it. HVAC control voltages are normally 24 Volts AC and not for the wireless thermostat power requirements.

Not surprised about the same life expectancy. Most of the Smartenit modules are built on the same base 2413 PLM board. With the same power supply issues. The 2450 I/O Linc has a different board in it but uses the same small switching supply IC and questionable filter capacitors. I have seen three different sized capacitors in one capacitor location, between early and later hardware versions. Though over kill the EZIO8SA has eight heavy duty relays in it but also needs its own PLM to function.

Smartenit also makes a 4 relay output module. I originally thought might work but it has a small current capacity relay of .5Amp. So it may not be suitable. http://smartenit.com/product/iot4r/

I believe the EZflora has triac outputs. So AC only. Also only one output goes on at a time.

Michel; Unfortunately I am not surprised by your statement on the Motion Sensor II Developers Notes. I saw a active developer on the Smarthome Forums. Also looking for the Motion Sensor II Developers Notes. Indicating his contact keep promising to sent them. Every week nothing was sent.

You may want to look at this thread. http://forum.universal-devices.com/topic/19331-my-plm-died-and-i-bought-a-new-one-what-should-i-do-next/?hl=%2Breplace+%2Bplm I have no ZWave devices so I can't comment on how to handle them. If you have a Pro version you can turn Off Automatic Writes to Battery devices. Then write to then one at a time so only one is wake so writes can be done to it.

There is a fairly long thread here on when it will be supported. http://forum.universal-devices.com/topic/21225-isy994i-2844-222-motion-and-fw/ The Alert Module and Siren Module are also not presently supported in 4.5.x firmware. They too are going to be included in a 5.0.x version. When it goes from Alpha to Beta or Released. I may then try it out.

Insure that you don't do a short cycle. Where the time period between the Off and the next On is short. Could be damaged by a short cycle. Almost all of the permanently installed HVAC units have a 5 minute time out between calling for a Cooling cycle. I know my portable room air conditioner use the have restarting issues if the power cycled Off and back On in a short time period.

All about the same age would not explain the problem. Some users have different age modules with different firmware. Some versions of firmware can have issues doing some functions.

Are all the KeypadLincs the same hardware and firmware revision? If they are brand new. Did you factory reset then first? As we sometimes see test links in factory new modules. Not removed before the factory shipped them. Many here have learned to always do a factory reset on any new modules we purchased.

I am glad to see you are back in business. Sorry I was not more specific in my power reset post. Teken nailed it.

Did you try a power cycle reset on the devices? On the off chance they powered back up in a confused state.

Have you tried opening a UDI Support ticket? UDI is very responsive. You can reference this thread in the Support Ticket. http://www.universal-devices.com/contact-support/

There is a Firefox V52 esr version. That still supports the npapi Java Plug In. I found it while searching the Firefox help web pages. I probably will not use it. As I have no big issues so far.

Have you had a chance to read the WIKI information on the Error and Memory LEDs flashing? Even if the PLM was dead. It should not be flashing the Error and Memory LED's. When my PLM failed. The only thing that happened was the system went into Safe Mode. No network issues happened. You even tried two ISY994i controllers with the same problem. Pointing to a network issue. You have something bad in your network. The two LEDs in the Network Jack of the iSY994i. Are they On and if there is network activity one maybe blinking? By chance did this happen when you had to change your internet modem and is it also your router?

If the Error and Memory LEDs flashing it is a network problem. From the UDI WIKI. http://wiki.universal-devices.com/index.php?title=Main_Page#Front_Panel_LEDs.2FLights

Is the 2441ZTH running on an optional DC wall wart or battery? On battery it is in power saving mode and a Query will not work unless woken up. Though it should send temperature changes when detected. Not sure how much of a temperature change is needed for it to send an update.

My Firefox just updated also. Now I get an annoying pop up informing me a web site, including here, is not secure. Log ins could be compromised. Then again when I click on the Password line. Password maybe compromised if you continue message. I have found no way to disable this very annoying feature.

Stu, Are you referencing the NC and NO relay contacts or the magnetic sensor in the kit? I just looked. The present kit has the single contact arrangement magnetic sensor. Not the older more expensive one with NO and NC outputs.

It does sound like the PLM maybe on its way out or failed. If it is over two years old and is a 2413S. When you cycled the power. Did you power up the PLM first and allow it to initialize? Before powering the ISY994i controller?

There are a few threads here on the All-On phenomenon. Many times there was a Motion Sensor in the mix.

Smarthome recently updated the sales page for the I/O Linc to indicate it was power line only and a range extender maybe needed in some installations. I imagine many users where not aware the I/O Linc was an older design power line only module. The box I got my Retail Boxed I/O Linc actually says on it "Wire Band".