RTD Modbus Temperature Transmitter.
DAT1485
The DAT1485 is a Modbus Temperature Transmitter that converts Thermocouples, RTD's Potentiometers, Resistance, and mV to Modbus RTU or Modbus ASCII. The DAT1485 is head-mounted and designed to fit into a DIN B head mounting enclosure. The sensor input, power supply, and the Modbus output are isolated from each other.
The DAT1485 Modbus Temperature Transmitter is PC programmable using the RS485 port and the Datexel software, which is free. The communication protocols are selectable such as Modbus RTU or Modbus ASCII, Modbus parity, Baud rate, and the stop bits. The input is also selectable, and has three different ranges for mV. The ranges are -100mV to 90 mV, -100mV to 200mV, and -100mV to 800mV. The different types of Thermocouples are K Type, J Type, R Type, S Type, T Type, B Type, E Type, and N-Type. The different types of RTD are Pt100, PT1000, Ni100, and NI1000 2 wire RTD or 3 wire RTD. The DAT1485 also can select the range of 500 Ohm or 2000 Ohm resistor input and 500 ohm and 50 kohm potentiometers. For the temperature input, you have the choice of ℉ ℃ or Kelvin.
The sensor inputs are linearized for Thermocouples and RTD's.
The sensor inputs are linearized for Thermocouples and RTD's.
| INPUT | OUTPUT | POWER SUPPLY |
|---|---|---|
| RTD Pt100, Pt1000, Ni100, Ni1000. | Modbus RTU/ASCII | Power Supply Voltage 18-30Vdc |
| Resistance 0-500 0-2kΩ | Reverse polarity protection 60Vdc | |
| -100 to 90 mV, -100 to 200 mV, | ||
| -100 to 800 mV, | ||
| Potentiometer up to 2 k Ω | ||
| CURRENT CONSUMPTION | CONFIGURATION | ISOLATION |
| 20 mA | PC Programmable | 1500 Vac 3-ways Galvanic Isolation |
| EMC | HOUSING | TEMPERATURE |
| For Industrial environments | Material self-extinguishing | Operating Temperature -4℉ +158℉ -20℃ +70℃ |
| Immunity EN 61000-6-2 | Dimensions W X H1 3/4" x 1" 43 x 24 mm | Storage Temperature -40℉ +185℉-40℃ +85℃ |
| Emission EN 6100-6-4 | Weight 1 1/2 oz 50 g | Humidity (non condensing) 0-90% |
| Input type | Min | Max |
| Thermocouple | ||
| J Type | -328℉ | 2192℉ |
| -200℃ | 1200℃ | |
| K Type | -328℉ | 2372℉ |
| -200℃ | 1300℃ | |
| S Type | 32℉ | 3182℉ |
| 0℃ | 1750℃ | |
| R Type | 32℉ | 3182℉ |
| 0℃ | 1750℃ | |
| B Type | 752℉ | 3200℉ |
| 400℃ | 1800℃ | |
| E Type | -328℉ | 1832℉ |
| -200℃ | 1000℃ | |
| T Type | -328℉ | 752℉ |
| -200℃ | 400 | |
| N Type | -328℉ | 2372℉ |
| -200℃ | 1300℃ | |
| RTD 2,3,4 wires | ||
| Pt100 | -328℉ | 1562℉ |
| -200℃ | 850℃ | |
| Pt1000 | -328℉ | 365℉ |
| -200℃ | 185℃ | |
| Ni100 | -76℉ | 356℉ |
| -60℃ | 180℃ | |
| Ni1000 | -76℉ | 302℉ |
| -60℃ | 150℃ | |
| Voltage | ||
| mV | -100mV | 700mV |
| Potentiometer | ||
| 0Ω | 500Ω | |
| 0.5KΩ | 50KΩ | |
| RES. 2,3,4 wires | ||
| Low | 0Ω | 500Ω |
| High | 0Ω | 2000Ω |
| Input calibration | |
| RTD | > of ±0.1% f.s. or ±0.2 ℃ |
| Low res. | > of ±0.1% f.s. ±0.15℃ |
| High res. | > of ±0.2% f.s. or ±1 Ω |
| Low res. | > of ±0.1% f.s. or ±3.6 ℉±0.2℃ |
| mV, Thermocouple | > of ±0.1% f.s. or ±10 uV |
| Input impedance | |
| mV, Thermocouple | <=10MΩ |
| Linearity (1) | |
| mV, Thermocouple | ± 0.2 % f.s. |
| RTD | ± 0.1 % f.s. |
| Line resistance influence | |
| mV | <=0.8uV/Ω |
| RTD 3 wires | 0.05%/Ω 50Ω (balanced max) |
| RTD excitation influence | |
| Typical | 0.4mA |
| CJC Compensation | ±1.5 ℉ |
| Thermal drift (1) | |
| Full scale | ±0.018 ℉ ±0.01% ℃ |
| CJC | ±0.018 ℉ ±0.01% ℃ |
| Warm-up Time | 3 min |
| RS485 port | |
| Baud Rate | 115.2 Kbps |
| Max. distance | 4000 ft 1.2 Km |
| Interface | RS485 |
| Protocol | Modbus RTU / Modbus ASCII |
| Power supply | |
| Power supply voltage | 18 .. 30 Vdc |
| Current consumption @24Vdc | 14 mA |
| Current consumption @18Vdc | 16 mA Max |
| Reverse polarity protection | 60 Vdc max |
| Load characteristic | Rload (maximum load value on current loop per power supply value) |
| Input - Power supply | 1500 Vac, 50 Hz, 1min |
| Input - Modbus RS485 | 1500 Vac, 50 Hz, 1min |
| Modbus RS485 - Power supply | 1500 Vac, 50 Hz, 1min |
| Temperature & humidity | |
| Operative temperature | -40℉ to 185℉ |
| -40℃ to 85℃ | |
| Storage temperature | -40℉ to 185℉ |
| -40℃ to 85℃ | |
| Humidity (not condensed) | 0 to 90 % |
| Housing | |
| Material | PC + ABS V0 |
| Mounting | DIN B head or bigger |
| Weight | 1.76 Oz |
| 50 g. | |
| Dimensions | Dia 1.69" H 0.95" |
| Dia 43mm H 24mm | |
| EMC | for industrial environments |
| Immunity | EN 61000-6-2 |
| Emission | EN 61000-6-4 |
| Input. | |
| mV | Positive 6 Negative 7 |
| Thermocouple | Positive 6 Negative 7 |
| RTD 2 Wire | 6 and 7 Compensation 5 |
| RTD 3 Wire | 6 and 7 Compensation 5 |
| Potentiometer | 6 and 7 Wiper 5 |
| Power Supply | |
| Positive | Positive 4 |
| GND Power Supply | Negative 3 |
| Power Supply | |
| Negative RS485 | Terminal 2 |
| Positive RS485 | Terminal 1 |
| Register | Description | Access |
| 40001 | Test | R/W |
| 40002 | Firmware [0] | RO |
| 40003 | Firmware [1] | RO |
| 40004 | Name [0] | R/W |
| 40005 | Name [1] | R/W |
| 40006 | Communication | R/W |
| 40007 | Address | R/W |
| 40008 | Delay RX/TX | R/W |
| 40009 | WatchDog timer | R/W |
| 40010 | System Flags | R/W |
| 40011 | Input type | R/W |
| 40012 | Degree Type | R/W |
| 40013 | Offset CJC | R/W |
| 40014 | Measure CJC | RO |
| 40015 | Input Value | RO |
| 40023 | Sync Input value | RO |
| 40031 | Input Offset | R/W |