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Direct connect cable
I've used a direct connect cable for years... They're easy to make and it's really sweet because you can make it long enough to access controllers in the ceiling.

Materials...

You need HVACPro, a windows 32 bit computer, a USB to serial port adapter, and a direct connect cable.

This might seem like an odd problem!!! We have an older Direct Gas Fired make-Up Air Unit that flame fails at start up. Once the unit has been started and all it's fine for the whole day. So far new...

I recently got one of these Robertshaw Books from my friend. Pretty Sweet!!!!! Thanks Yves!!!!

Remember working on a lot of Robertshaw Controllers. They were really easy because the manufacturer pressure was 12 PSI. So a proportional band of 10% meant that a input change of 1.2 psi changed the...

If you replace the NCM's, just make sure the NAE's support all your controllers. I seem to have remembered they don't support DCM's.

We put in some electronic pneumatic stats that communicate via BACnet wiressly from Millenial Net. I think Johnson makes them and other manufacturers. Pretty sweet

Pneumatic Control Terms



Controller – A device that receives an input from a sensor and outputs the appropriate signal.

Controlled Variable – The substance that your trying to maintain,...

What kind of issues has anyone had with Niagara 4.6 that was released in July.

First off you have to determine which system you have. You should have some sort of front end controller. The front end controller would be connected the communication bus from the controllers. The...

Do you have NAE's or NCM's for the front end? Then do you have pass thru on the front end with a copy of HVAC Pro so you can back up the configurations for the controllers and download them. Also I'm...

I kind of figured it was a major undertaking. Probably involves a bunch of temporary panels and lots of temporary wiring etc... Some of the big issues are when there are numerous global points and...

If you search HVAC Pro you will get more information on lap top requirements utilizing M-tools. I know the last time I used HVAC Pro you needed a 32 bit computer with Windows Xp. Although some people...

So does anyone have any comments on the Meshcape Pneumatic Thermostats from Millenial Net. Or maybe where to purchase them. Thanks

Wow, that looks like a lot of work!!!

How did you get all the devices and components into the cabinet. The DCMs I've seen are like maxed out with numerous pneumatic outputs.

It does seem that quite a few people don't see the writing on the wall. I was just wondering how do you replace such a beast that normally has smoke control logic. Not sure you could fit enough...

I remember some of our sites for Johnson Controls used Hyper Terminal to access the NCM's. If that's the case you would have to get PMI software that you could load on a 32 bit Windows XP machine.

When I worked for Johnson Controls some of our biggest facilities had NCU's with DCM-140's and of course all the modules. I remember when the NAE came out it did not support DCM's. So I was wondering...

https://www.esmagazine.com/articles/98788-back-to-basics-sensors-and-actuators?utm_medium=Email&utm_source=smartphone&GenwiShareGUID=cb36f6a7-df8a-4306-906f-e2d0ab495bf0

The N-2 Bus...

I don't know how may times I've run across a vav unit with the reverse volume reset controller bypassed.
Then the vav box closes when it's hot and opens when it's cold.

I have an isolation valve that can isolate the air compressor and allow me to use a temporary air compressor through the air dryer. Pretty slick

I always liked to simulate the thermostat signal and use a flow hood to set my minimum and maximum air flow. Of course it's really important to have the thermostat calibrated.

I use a N-2 direct connect cable which is basically a serial cable with an N-2 connector on one end. I of course used a usb to serial adaptor on port 1.

(N-2 connect cable). 5 to N2+, 2 to N2-,...

I would start with the DDL Programmer's Manual from JCI. You can download it online from the Big Johnson.

You also have to determine a throttling range so you can adjust either the gain or proportional band.

I've found that proper shielding and installation of the N-2 bus is paramount to success. Make sure you don't have any areas T tapped and the distances between devices is within parameters. I would...

PBD

Physics be dammed - I don't give a f:censored:k what your psychrometrics chart says. We need to lower the relative humidity without running the chiller!!!! LOL

I was looking through my lesson plans and I noticed we had a section on adaptors. I consider an adaptor anything that you need to make things work together. One of the most common is isolation boards...

It's really important to know how a motor control center works. The controls person normally gets to a building where the fans or pumps are not running. To understand how these motor control centers...

Being a former instructor I would want to cover temperature scales, btu's, etc... I would also have a section on motors and motor controls. Probably should throw in some fire alarm shutdowns for good...

Can you give us more information on the platform????

I would try another controller or maybe disconnect the wires. I've seen strange wiring issues cause strange problems. I had this one time where the customer told me that when they put clean filters...

When I worked for Johnson Controls we learned that uploads are good and downloads are bad. I would always have a spare AHU on hand just in casers. Hopefully you uploaded the original configuration...

RP971A Pneumatic Ratio (Sequencing) Relay has the ability to change spring ranges and spans for the pneumatic actuator.

I just wanted to update this post to share the fix. Apparently we didn't have the right version of the Tcom driver.

I've used controllers to replace roof top controls. It requirea a very configurable controller.

The voltages look good for the N-2 buss. I would suspect something with the S-4.

We have just ordered some Jaces with the Tcom driver. Having issues with communications. Does it hook to the second port of the Jace. Help!!!!!!

You could have a back up NCM and workstation ready to go if anything happens. Makes it look like your prepared and such!!!!

1. The fan air flow switch is inoperative during the weekend and you don't want to call the maintenance person in at overtime rates.

2. You want to shut down all the air handlers during an...

Thanks man, I really needed a solution to permanent overrides!!!!

Thanks Jay_T

We have Vykon Jace's and would like some basic settings that work for Loop Control. We never really got that detailed during the AX certification course and I've struggled to stabilize the air...

My question is which Metasys are you talking about. PMI or a NAE?

Direct N-2 Buss Connect Cable

N-2 connect cable

1. (Serial Port Connector. 5 to N2+, 2 to N2-, and 3 to ref, with a 470 ohm resistor between 2 and 5.

2. Materials – Old Serial cable, 470 Ohm...

I remember if you didn't have the original download files then you wouldn't have the tags. What that meant is that you could upload the program but the names were generic. So your sitting in front of...

Hey Stevo, will the S4 Open: Bacnet Router pick up DCM's?

I know this is a very old post, but i was wondering how the direct connect cables worked out for you.