Delta Rs485 Unonext Uno-7tb Indoor Air Quality Monitor User Manual

RS485 UNOnext UNO-7TB Indoor Air Quality Monitor
User ManualDelta Electronics, Inc. 
UNOnext UNO-7TB
Troubleshooting: RS485
V20220225

RS485 UNOnext UNO-7TB Indoor Air Quality Monitor

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.

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

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
   208	OxDO	0	Ox00
   209	0xD1	1	Ox01
   210	0xD2	2	0x02
   211	0xD3	3	0x03
   212	0xD4	4	0x04
   213	OxDS	5	Ox05
   214	0xD6	6	0x06
   215	OxD7	7	0x07
   216	OxD8	8	0x08
   217	OxD9	9	0x09
   218	OxDA	10	OxOA
   219	OxDB	11	OxOB
   220	OxDC	12	OxOC
   221	OxDD	13	OxOD
   222	OxDE	14	OxOE
   223	OxDF	15	OxOF

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
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
   76800	6	7
   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.

References

• UNO IAQ Solution Resource Center