Loytec L-VIS BACnet Help
Purchased one of these devices for a small 2 controller project. My first attempt with the Loytec product and JCI PCG controllers. We have managed to create a decent menu structure with a pretty good navigation menu. My problem is the actual point data. When we scan the BACnet data, we get all of the points but a lot of them are broken down to read and write values. For example, cooling valve output only comes in as a write value. When the value is added to the display it appears as faded. Is there a way to get the read value so it is displayed as solid?
Data that is greyed out is not reliable, meaning there is a form of communication problem.
Originally Posted by mechdorn
The L-VIS has a built in webserver where you can see all your data points and the status.
If you are updated to the latest firmware, you can do a MSTP packet capture from the device.
Also, there are BACnet settings and statistics also available for adjustment.
The first step (with BACnet) is to scan and bring in your objects you want to use.
Second, verify the communication is good by checking the objects on the web page of the device.
Then, start putting those objects into your project.
You can always contact the support email or tech support number for more help.
Another thing, depending on how the point is configured in the LVIS the read value will stay greyed out until it is written to. (no default value set up?)
Another thing to consider is the data point flow.
The Cooling Valve output needs to be a write from the JCI PPG controller, because it is writing the value to the network.
However the Loytec needs to read the value from the network, so the cooling valve value needs to be configured as a Bacnet Read Datapoint.
If you configure the L-Vis with "write" datapoints (they will be greyed out until you have a valid value entered), then you need to input a value on the L-Vis screen, because it thinks you want to Write to the Bacnet network.
If you configure the L-Vis with "read" datapoints then the L-Vis will attempt to read the value from the Bacnet network, so your datapoint mapping needs to be correct, for it to show correctly.
Took me a while to get my head around the concept, and I still make the odd mistake (actually quite a few to be honest), another thing you can do is to download the LINX User manual, which also details the Loytec Bacnet workflow, in more detail.
"If you configure the L-Vis with "read" datapoints then the L-Vis will attempt to read the value from the Bacnet network, so your datapoint mapping needs to be correct, for it to show correctly." This is exactly what I'm talking about, how do I configure it for read points?
Originally Posted by grgjohno
If I understand you correctly.
Originally Posted by mechdorn
You may not see a read value until you write to it from the LVIS.
Add both the read and the write value to the selected control in the lvis project.
You may want to set up a default value in the control (text, numeric, bar, etc...)that the device uses on start up. (after a download)
In this pic below, I have pulled in a Modbus datapoint from a Chiller, so that it can be displayed.
So set your Johnson datapoint properties that you want to display on the L-Vis to write.
Then configure a datapoint in L-Vis to read that datapoint from the network.
Thats really all there is to it