Building Automation Knowledge Base

Issue How many messages are buffered on a 7716xx / 7718xx / 7756xx / 7780xx / 7792xx? Environment I/NET Seven PCU 7716, 7718, 7756, DLCU 7780, MRI 7792xx Cause Even though every device in the system contains a message queue, only a few of the devices will successfully buffer the queued messages for later distribution. All controllers and Taps distribute messages out of their RS485 port even with the absence of any LAN communication. This is due to the fact that there is no requirement for an acknowledgment to be received at the generating device. The RS485 LAN is for both solicited and unsolicited message traffic. The only devices that perform extended buffering are the ones which directly communicate to polling devices such as the 7801 Taps, 7803 Taps, 7804 Taps, and all DPUs/SCUs. The MRs, ASCs, and UCs do not generate messages; messages relating to these devices are generated by the relevant MRI, MCI, etc. Resolution The 7716xx/18xx/56xx/80xx/92xx can buffer approximately 150 messages.

Issue How many messages are buffered on a 7798xx / 7793xx / 7791xx? Maximum number of the Message which can be stored on I/SITE locally? Environment I/NET Seven  7798, 7798B, 7798B1 and 7798C (I/SITE LAN) (SLI) Cause Even though every device in the system contains a message queue, only a few of the devices will successfully buffer the queued messages for later distribution. All controllers and Taps distribute messages out of their RS485 port even with the absence of any LAN communication. This is due to the fact that there is no requirement for an acknowledgment to be received at the generating device. The RS485 LAN is for both solicited and unsolicited message traffic. The only devices that perform extended buffering are the ones which directly communicate to polling devices such as the 7801 Taps, 7803 Taps, 7804 Taps, and all DPUs/SCUs. The MRs, ASCs, and UCs do not generate messages; messages relating to these devices are generated by the relevant MRI, MCI, etc. Resolution Controller software prior to I/NET version 2.xx = approximately 150 messages. Controller software for I/NET version 2.0 Without emulated tap: 100 Messages With emulated tap: 1000 Messages.

Issue Need to know how many messages are stored in the buffer of an NPR Environment I/NET NPR Cause Host workstation disconnected or not masked to receive messages.  Need to know how much data is recoverable Resolution NetPlus Routers = approximately 1000 messages. Once this is full, messages are deleted on a First in First out basis

Issue What is the Standard Cubic Inches per Minute for a PWMP1? Environment PWMP1 Cause Configuration Question Resolution 216 SCIM @25 psi.

Issue What type of BIN is used when selecting “Typical” or the default install of I/NET 2000? Environment I/NET 2000 site Cause Refer to the Communication chapter in TCON209, I/NET 2000 Technical Reference Guide for information on synchronous versus asynchronous communication. Resolution Determine whether you will use synchronous or asynchronous communication. Setup's Typical option (the default) installs asynchronous BIN files. You should choose the Synchronous option to install synchronous BIN files. You may switch from synchronous to asynchronous, or vice versa, at a later date by choosing the Custom option and then selecting the appropriate controller binary files. Instructions are provided in Chapter 2, Installing I/NET in TCON 213.

Issue Which Controllers and Taps are supported by the MIP? Environment I/NET site Cause Which Controllers and Taps are supported by the MIP? Resolution 7700 7740 7741 7760 7770 7720 (8000 RTU) 7730 (P4300 DCU) 78035 LAN Tap 78040 Host/Link Tap (Dial) 78050 Link Tap (Dial) 78060 LAN Tap (Dial) 78041 Host/Link Tap (Dial w/o modem) 78051 Link Tap (Dial w/o modem) 78061 LAN Tap (Dial w/o modem) 7810 Printer Tap 78010 Host Tap 78015 Host/Link Tap (metal enclosure) 78020 Link/LAN Tap (metal enclosure) 78035 LAN Tap 78040 Host/Link Tap (Dial) 78050 Link Tap (Dial) 78060 LAN Tap (Dial) 78041 Host/Link Tap (Dial w/o modem) 78051 Link Tap (Dial w/o modem) 78061 LAN Tap (Dial w/o modem) 7810 Printer Tap

Issue I replaced the EPROMs and RAM in a 7700 DCU with a MIP, but now cannot do a software restore. What is wrong? Environment I/NET site Cause I replaced the EPROMs and RAM in a 7700 DCU with a MIP, but now cannot do a software restore. What is wrong? Resolution Verify that the network configuration is correct in the NET. Con. Editor. The "Dn" field for the TAP or Controller must be configured with a "Y" before the Tap/Controller will appear in the software Restore Editor.

Issue Is the point address automatically stored in Docutrend? Environment I/NET site Cause Is the point address automatically stored in Docutrend? Resolution No. The point address is not sent to Docutrend. Refer to TCON 084 or TCON 210.

Issue What is the maximum number of Docutrend cells a workstation can have? Environment I/NET Cause Configuration Resolution 1023 Cells.

Issue What is Docutrend? Environment I/NET site Cause What is Docutrend? Resolution A proprietary data storage, retrieval, and custom report definition and generation program provided with I/NET.

Issue What is a Demand Control in I/NET Software? Environment I/NET site Cause What is a Demand Control in I/NET Software? Resolution This editor is used to monitor and control electrical power consumption. With it, you can maintain a daily or monthly consumption total. Demand control enables demand shedding of electrical loads when demand is high, and the restoration of the loads when demand levels drop. This editor is used to direct demand data to a Docutrend cell.

Issue What is DIF? Environment I/NET site Cause Definition for DIF (Data Interchange Format) Resolution This stands for Data Interchange Format. It is a special format for data files that can be read by most major spreadsheet programs. Docutrend data can be converted into this format for use by a third-party software program. Refer to TCON 210.

Issue Explain the term "Distribution Group" Environment I/NET site Cause Explain the term "Distribution Group" Resolution I/NET has four distribution groups, each with eight mask positions, extending the number of possible masks in a system to 32. Messages must match both a distribution group and active mask position before being accepted by a host.

Issue What does DLCU stand for? Environment I/NET site Cause What does DLCU stand for? Resolution Distributed Lighting Control Unit. This is a specialized type of controller or DCU. The 7780 is a DLCU. The DLCU is specifically designed for lighting.

Issue What are Conversion Coefficients? Environment I/NET site Cause What are Conversion Coefficients? Resolution These are mathematical constants a controller uses to convert analog input / outputs from the digital value used by the microprocessor to analog display values. Conversion coefficients are also used to convert digital commands from the microprocessor into analog outputs which are then used by field interface devices.

Issue What is DBF? Environment I/NET site Cause What is DBF? Resolution It is a Docutrend database function that allows you to extract the tenant number, key/card number, or data from one of the access control personnel database files.

Issue What is a DPI? Environment I/NET site Cause What is a DPI? Resolution It is a Door Processor Interface. It is also called a 7791. The DPI provides a communication gateway between the controller LAN and the DPUs.

Issue What is a MRI? Environment I/NET Site Cause What is a MRI? Resolution It is a abbreviation for Micro Regulator Interface. This is a 7792. The MRI provides a communications gateway between the controller LAN and the MRs on the SubLAN.

Issue What is Override Billing? Environment I/NET site Cause What is Override Billing? Resolution This is a point extension editor that lets you compute the amount of time a customer overrode the after-hours operating parameters for heating, cooling, and lighting.

Issue In relation to Docutrend, what is "Propagation"? Environment I/NET Site Cause In relation to Docutrend, what is "Propagation"? Resolution This is a Docutrend extraction option that instructs the system to "fill in" missing data by repeating the last valid entry until it once again encounters valid data. This option is primarily used with time-based plots.