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Documentation Number 485DTT1795
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Digital Thermometer Thermostat with RS-485 Interface
Model 485DTT
Electronics' 485DTT inexpensive digital thermometer thermostat which operates through RS-485 interface. Non-volatile registers hold programmable high thermostat settings. Current temperature reported polling DTT, while thermostat operations continue long unit powered. RS-485 interface allows multiple units communicate 4000 feet single pair wires.
Features
±0.5°C accuracy resolution High, hysteresis type thermostat outputs Port-powered from host RS-232 port (RTS high) Thermostat thresholds programmable non-volatile registers Latching Status Register indicates which thermostat outputs have tripped Programmable node address turn around delay allows nodes multidropped
Specifications
Communications Standard: Baud Rate: Format: Connector: Optical Isolation: RS-485 four-wire 1200 9600 (automatic detection) data bits, stop bit, parity DB-25S (female), RS-530 pinouts TD(A) TD(B) RD(A) RD(B) optical isolation required, B&B's 485HSPR high-speed optically isolated converter with this product.
Thermometer Error ±0.5°C from 70°C ±1°C from -40°C 70°C 85°C (±1.8°F from -40°F 32°F 158°F 185°F) (The 485DTT guaranteed operate from 0-70°C) Thermometer Resolution: 0.5°C Temperature Conversion Time: second Open Collector Thermostat Outputs (on) voltages: 1.2Vdc max. High (off) voltages: 40Vdc max. Power External power: 12VDC 25mA
Electronics January 1995
Documentation Number 485DTT1795
Please contact Technical Support more information.
485DTT Functions
Digital Thermometer 485DTT continuously measures temperature, with measurement completed once second. When Read Temperature command received, immediately reports back result last measurement completed, using 9-bit, two's complement format. ninth sign bit. this temperature above 0°C. temperature less than 0°C. Each represents 1/2°C. Programmable Thermostat 485DTT also functions thermostat. non-volatile registers programmed. high threshold register, programmed using !0SH command. threshold register, programmed using !0SL command. Thermostat operation continuous background function. long unit powered, thermostat outputs will serviced. Three open collector outputs provide thermostatic controls. These outputs current sinking (low) when high impedance (high) when off. THIGH Turns when temperature equals exceeds user programmed register. TLOW Turns when temperature equal less than user programmed register. TCOM Turns when temperature equals exceeds register turns when temperature equal less than register. This output allows user program amount hysteresis.
485DTT Commands
commands issued from program, even typed from simple terminal program. files included 485DTT disk help learn commands. sample program with source code written QuickBASIC demonstrates functions simple terminal program also included. addition, simple data logging utility provided which allows data logged file.
Function read temperature read status register read high thermostat read thermostat clear status register high thermostat thermostat address turn around delay
Command Summary Command Argument !0RT none !0RS none !0RH none !0RL none !0SC none !0SH bit, comp. !0SL bit, comp. !0SA address char byte) !0SD number chars delay byte)
Return Value bit, comp. byte bit, comp. bit, comp. none none none none none
Electronics January 1995

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