Knowledge Base - NexSensKnowledge Base - NexSens
User Guide for NEXSENS models including: TS210, T-Node FR Thermistor String, T-Node FR, Thermistor String, T-Node FR Thermistor String, String
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DocumentDocumentT-NODE FR THERMISTOR STRING QUICK START GUIDE Wiring Connection Table 1: Wiring Table for UW-FLxR Cable. Figure 1: NexSens T-Node FR Thermistor String. Overview The NexSens T-Node FR Thermistor String features a series of connected sensors containing integral titanium thermistors secured in protective housings. Each sensor is accurate to +/- 0.075°C. Readings stabilize within 60 seconds due to the thermistors direct contact with water. Temperature data is transmitted on a RS485 Modbus RTU string bus for integration with data loggers and SCADA systems. The string is powered by 4-28 VDC for operation on a 12 or 24 VDC power supply. Strings terminate in a NexSens UW plug and receptacle connector, allowing additional sections or sensors to be added. Sensor Information Specs · Dimensions: 13.46 cm L x 3.56cm Dia. (5.3 "L x 1.4"Dia.) · Range: 0 to 45°C (32 to 113°F) · Resolution: 0.01°C · T90 Response Time: 60 seconds · Maximum Depth: 200m (656 ft.) · Maximum Length: 1219m (4000 ft.) General · Power: 5-24 VDC · Protocol: RS-485 (Modbus-RTU) · Baud Rate: 19200 · Parity: N81 · Default Starting Address: 1* · Format: Big Endian · Timeout: 500 ms *On a T-Node FR string with multiple nodes, the nodes should be addressed in increasing numerical order. Receptacle Pin Wire Color 1 Green 2 Blue 3 Brown 4 Red 5 White 6 Yellow 7 Black 8 Orange T-Node FR Signal RS485-A RS485-B PassThrough 12VDC -- PassThrough GND PassThrough Figure 2: UW-FLxR receptacle cable pinout. Note: The UW-Receptacle to flying lead cable is a separate accessory that may be purchased for integration with a third-party Modbus controller. It is not needed to connect the temperature string to a NexSens X2-Series data logger. Modbus-RTU Register Information Table 2: Read temperature. Function 0x04 (Read Input Registers) Registers Data Type Data Size Purpose 0x0006,0x0007 32-bit Float Big-endian 2 Registers Requests the temperature recorded in °C. Example Input: 01,04,00,06,00,02,91,CA · Requests the temperature reading from address 1. Example Output: 01,04,04,41,AF,38,1D,0C,50 · Sensor responds with 0x41af381d (21.9024°C). Table 3: Change Modbus address. Function 0x10 (Write Multiple Registers) Registers Data Type Data Size Purpose 0x1000 16-bit integer 1 Register Changes the Modbus address of the first node on the TS210 string*. *Assuming the first node of the string begins with address 1 Example Input: 01,10,10,00,00,01,02,00,05,77,92 · Changes Modbus address from 1 to 5. Example Output: 01,10,10,00,00,01,05,09 · Sensor responds acknowledging new address. Universal Modbus Address The T-Node FR is programmed such that any sensor will respond to Modbus address 251. This is implemented for the event that the sensor's current address is unknown. Note: This address should only be queried with one sensor connected to the data line. If more than one sensor is connected, both will respond and a bad message is likely. Table 4: Read current address using universal address. Function 0x04 (Read Input Registers) Registers Data Type Data Size Purpose 0x1000 16-bit integer 1 Register Uses the universal address (251) to read the current node address. Example Input: FB,04,10,00,00,01,21,50 · Uses universal address (FB) to read current address. Example Output: FB,04,02,00,07,20,E6 · Current Modbus address is 7 (0x0007). NexSens Data Logger Connection 1 Setup your data logger on WQData LIVE by: a. Following the included data logger quick start guide with your order. b. Visiting the NexSens Knowledge Base · nexsens.com/knowledge-base-v2 2 Plug the string into an open sensor port on the data logger for autodetection. 3 After the next logger reading: a. Confirm that all temperature nodes on the string have been recognized. b. Ensure that each show valid temperature readings. c. Gather a few readings before deployment. IMPORTANT - BEFORE FIELD DEPLOYMENT: Ensure to connect a UW-plug on the last node of the string to prevent water intrusion. For additional information, please reference the T-Node FR Resource Library on the NexSens Knowledge Base. nexsens.com/tnodekb 937-426-2703 www.nexsens.com 2091 Exchange Court Fairborn, Ohio 45324