User Manual for DELTA models including: RS485 UNOnext UNO-7TB Indoor Air Quality Monitor, RS485, UNOnext UNO-7TB Indoor Air Quality Monitor, Indoor Air Quality Monitor, Air Quality Monitor, Quality Monitor, Monitor
2 RS485 UNOnext UNO-7TB supports Modbus RTU and BACnet MS/TP via RS485, and these two protocols run simultaneously. Following the document: UNOnext BACnet use guide, the Building Management System (BMS)
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23 feb 2022 — system retrieves the UNOnext data RS485 interface. If there is any trouble, please check the items below to verify the environment and device settings in ...
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DocumentDocumentDelta Electronics, Inc. UNOnext UNO-7TB Troubleshooting: RS485 V20220225 RS485 UNOnext UNO-7TB supports Modbus RTU and BACnet MS/TP via RS485, and these two protocols run simultaneously. Following the document: UNOnext BACnet use guide, the Building Management System (BMS) system retrieves the UNOnext data RS485 interface. If there is any trouble, please check the items below to verify the environment and device settings in the RS485 bus. All referred documents can be found at https://isdweb.deltaww.com/resources. 2 Environment Settings 1. Check for correct power from the 9-24V DC input or adapter is correct. The requirement of Adapter is output 12VDC/1A. Please refer to Quick start guide about the mechanical specification of mechanical. If the power supply is normal and the UNOnext hardware is normal, the power led is on. If the power supply is normal but the power led is not on, please send UNOnext back for repair. 2. For Modbus RTU, check that the A2 (+) and B2 (-) are properly connected to Modbus RTU client. 3. For BACnet MS/TP, check that the A1 (+) and B1 (-) are properly connected to BACnet MS/TP client. 4. Check the cable specifications. It is recommended to use a 22AWG/24AWG multi-core shielded twisted pair cable or above to achieve the best performance for UNOnext. 5. Check that the signal and power wire are in the same conduit or not. It is recommended to separate the signal and power wire into separate conduit. Or use the individual power supply for UNOnext. Please refer the following suggested RS485 wire specs: Twisted Pair Cable 22-24AWG twisted pair, shielded jacketed communication cable. Characteristic impedance of 100-120 ohms. Capacitance of 17 pF/ft conductor-to-conductor or less. 18AWG cable does not meeting this specification. Braided or aluminum foil shield. Velocity of propagation of 66% or higher. Example compatible cable products are Belden 9841, Belden 82841 and Windy City Wire 42002-S 3 Device Settings 1. Check the Modbus RTU slave address and BACnet MAC address settings. The Modbus RTU slave address and BACnet MAC Address are set by DIP switch from [2] to [5] in the back of UNOnext. The DIP definition of address is shown as below table. Modbus Salve Address BACnet MAC Address PIN No. of DIP switches Decimal Hexadecimal Decimal Hexadecimal 2 3 4 5 208 0xD0 0 0x00 209 0xD1 1 0x01 210 0xD2 2 0x02 211 0xD3 3 0x03 212 0xD4 4 0x04 213 0xD5 5 0x05 214 0xD6 6 0x06 215 0xD7 7 0x07 216 0xD8 8 0x08 217 0xD9 9 0x09 218 0xDA 10 0x0A 219 0xDB 11 0x0B 220 0xDC 12 0x0C 221 0xDD 13 0x0D 222 0xDE 14 0x0E 223 0xDF 15 0x0F 2. For Modbus RTU, check the UART settings. The UART settings for UNOnext as: Baud: 9600 by default, also supports 38400, 57600, 115200 modified by Modbus RTU protocol. (See UNOnext BACnet use guide or UNOnext Modbus RTU) Data-bit: 8 Parity: None Stop-bit: 1 4 3. For BACnet MS/TP, check the UART settings. The baud rate of BACnet MS/TP UART settings is set by DIP switch [6] and [7]. Refer to the below table. BACnet MS/TP Baudrate Baudrate DIP 6 7 76800 9600 19200 38400 4. If the UNOnext daisy-chained for longer distances, please pull up the DIP switch [1] to enable RS485 terminal resister to try. 5. Try a factory reset. If the problem is still not solved after checking and modifying the above device settings, please try to restore the factory settings. METHOD: After booting, press the reset key three times duration one second to execute factory reset. After factory reset, all settings will be cleaned. Note. If all actions do not resolve the problem, please contact your dealer for assistance. 5