Building Automation Knowledge Base

Issue Can I use analog modems on digital phone lines? Environment I/NET site Cause Can I use analog modems on digital phone lines? Resolution Using analog modems with digital phone lines will damage the modems.

Issue Determine whether a phone line is digital or analog for a modem on an I/NET site Environment I/NET site Cause Determine whether a phone line is digital or analog for a modem on an I/NET site Resolution The customer may have the answer, but a better option would be to contact the Phone Company Tech Support section to be sure. A standard DVOM may not give reliable information.

Issue Running AVIs in I/NET 2000 Environment I/NET Site Cause Running AVIs in I/NET 2000 Resolution Though It has been done, this feature is not officially supported.

Issue Need to locate the microprocessor on a 7740 or 7741 Environment PCU 7740 PCU 7741 Cause Need to identify the chip for replacement Resolution The correct chip is labeled U7.

Issue Can a 7740 read 4 to 20 milliamp input? Environment I/NET site Cause Some sensors will only output a 4-20ma signal and the controller must be able to read it in order to display the sensor values. Resolution Although the controller is calibrated to read 1 to 5 volts, a voltage sensing resistor can be added to read 4 to 20 milliamps. Refer to TCON 092 for details.

Issue Information on a MAMAC sensor Environment I/NET site Cause information on a MAMAC sensor Resolution Their phone number is (United States) 1-800-843-5116. Their fax is 612-829-5331

Issue What is the equation to convert Celsius to Fahrenheit? Environment I/NET Calculation Editor Cause Unit Conversion Resolution Use the Equation: F = 1.8 x C + 32 In I/NET this would appear as C0*P0+C1. C0=1.8; C1 = 32; P0 = °C AI

Issue Formula for BTU/Hr heat exchange in a coil Environment I/NET site Cause Formula for BTU/Hr heat exchange in a coil Resolution Q = 500 x GPM x ΔT; where: 500 is a math constant GPM = Gallons Per Minute ΔT = Sensible heat change

Issue Conversion Equation for Fahrenheit to Celsius Environment I/NET Site Cause What is the Conversion Equation for Fahrenheit to Celsius Resolution C = 5 / 9 x (F-32)

Issue Can I run an anti-virus software on an I/NET host? Environment I/NET Site Cause Anti-Virus on Host PC? Resolution Yes, but I/NET must be shut down, with all associated drivers, during the virus scans. Also, have the anti-virus shut down when installing I/NET on the PC.

Issue Error code 2041 when reading a SNVT from a TAC Xenta 103 Environment TAC Xenta 103 Cause Bindings may have been made with LonMaker after the device was created in TAC Vista. The wrong address is referenced in TAC Vista. Resolution Error code 2041 means no answer from the TAC Xenta unit. Invalidate the addresses in TAC Vista Reread the addresses for the unit using status window for the unit.

Issue Can I connect a thermistor to a TAC Xenta 471? Environment Xenta 471 I/O module Thermistor sensor Cause Xenta 471 does not have any thermistor inputs. Resolution TAC Xenta 471 has 8 analog inputs that can be set up as current inputs (0/4-20mA with external power and 4-20 with internal power) or as voltage inputs (0-1, 0/2-10 V DC). 

Issue Why does I/NET require all other software to be shut down during installation? Environment I/NET Site Cause Why does I/NET require all other software to be shut down during installation? Resolution It is not just I/NET that this makes a difference on. Any software install process can be disrupted or have errors induced, if other items are running or starting in the background of the PC. The problems can range from files being copied with errors, to certain files not being copied at all. It is a good practice when installing any software, to end task on all applications except windows.

Issue What is a node? Environment I/NET Site Cause What is a node? Resolution A node is a device, connected to a network, which can communicate with other nodes, using a common protocol, be addressed (having a unique identification and perform calculations) and/or exchange data with other nodes.

Issue What is the limit of nodes on a segment? Environment I/NET Site Cause What is the limit of nodes on a segment? Resolution There can be up to 64 nodes in a segment under optimal conditions(FTT-10A and TP/XF-1250) or 128 (LPT-10). Two segments can be connected by the use of a repeater, but are still one channel.

Issue Why not assign global or indirect points to an MR? Environment I/NET Site Cause Why not assign global or indirect points to an MR? Resolution If you do, anytime your sublan has communication problems, they will often cause problems on your controller lan. Another problem is that point values from indirect points to not pass through some MR-DDC modules.

Issue What is DLA? Environment I/NET site Cause DLA Explanation Resolution DLA stands for Distributed Link Architecture. It is a software package, that is an addition to I/NET 2000, which provides the ability to have more than 100 NPRs in a given system by sharing link numbers among them. It is explained in TCON 297.

Issue What I/NET 2000 revisions work with DLA? Environment I/NET Site Cause What I/NET 2000 revisions work with DLA? Resolution I/NET 2000 rev 2.12 and above work with DLA. It also contains and requires NPR bin file rev 1.10.

Issue How can I use global and indirect points with MRs/ASCs? Environment I/NET site Cause How can I use global and indirect points with MRs/ASCs? Resolution Assign them to an address in the SLI that is unused by any MR or ASC. Then use a calculation on the point in the MR to get the value from the indirect point. (Or put the calc on the global point to get the value FROM the external MR point.)

Issue Can I modify the SNMP name or address on an NPR? Environment I/NET site Cause Can I modify the SNMP name or address on an NPR? Resolution If the customer has an SNMP manager on site and wants to use this function, enter the information he gives you. If not, leave them alone. If the address gets set to 0.0.0.0, you will have communication problems across a commercial router.