Carrier 48/50HC04-28 Controls, Start-up, Operation And Troubleshooting

Also see for 50HCQ04---12: Controls, Start-Up, Operation and Troubleshooting Instructions Service and maintenance instructions

Carrier 48/50HC04-28 Controls, Start-up, Operation And Troubleshooting Manual pdf 13 page image

13C10821Fig. 13 -- Enthalpy Switch and Sensor WiringCommunication Wiring--ProtocolsGeneralProtocols are the communication languages spoken bycontrol devices. The main purpose of a protocol is tocommunicate information in the most efficient methodpossible. Different protocols exist to provide differentkinds of information for different applications. In the BASapplication, many different protocols are used, dependingon manufacturer. Protocols do not change the function ofa controller; just make the front end user different.The RTU Open can be set to communicate on fourdifferent protocols: BACnet, Modbus, N2, and LonWorks.Switch 3 (SW3) on the board is used to set protocol andbaud rate. Switches 1 and 2 (SW1 and SW2) are used toset the board’s network address. See Fig. 14 and 15 forprotocol switch settings and address switches. The 3rdparty connection to the RTU Open is through plug J19.See Fig. 16 for wiring. Refer to the RTU Open v3Integration Guide for more detailed information onprotocols, 3rd party wiring, and networking.NOTE: Power must be cycled after changing the SW1--3switch settings.i--VuR Building Automation Systemi--Vu is a Carrier front-end and Building AutomationSystem (BAS). It is a web based network system that usesa native BACnet over MS/TP communication protocol.The speed of the network can range from 9600 to 76,800baud. Open controllers communicate with a proprietarylanguage called Linkage in i--Vu. Linkage is establishedautomatically and allows the flow of specific data acrossOpen devices. Refer to i--Vu literature for moreinformation on i--Vu.BACnetR MS/TPBACnet Master Slave/Token Passing (MS/TP) is used forcommunicating BACnet over a sub--network ofBACnet--only controllers. This is the default Carriercommunications protocol. Each RTU Open module acts asan MS/TP Master. The speed of an MS/TP network canrange from 9600 to 76.8K baud. Physical Addresses canbe set from 01 to 99.48 ---50LHTCQ ---01T