Ascon Tecnologic - TRH-MINI - ENGINEERING MANUAL - PAG. 2
Electrical connections
Carry out the electrical wiring by connecting only one wire to each
terminal and according to the following diagrams:
General notes about wiring
1.
Do not run input wires together with power cables.
2.
When a shielded cable is used, it should be connected at one
point only.
Power supply
Power supply: 8... 24 DC
Range: -20... +80°C, 0... 100% RH
TRH-MINI
GND VDC B A
+
−
8... 24 VDC
Serial Interface
Power supply: 8... 24 DC
Range: -20... +80°C, 0... 100% RH
TRH-MINI
GND VDC B A
B
A
RS-485
B
A
Controller
A
B
A
B
A
B
120
Ω
n
th
TRH
2
nd
TRH
1
st
TRH
Notes: 1.
RS-485 interface allows to connect up to 30 devices
with one remote master unit.
2.
The cable length must not exceed 1.5 km at 9600 baud.
TECHNICAL CHARACTERISTICS
Tecnical specifications
Characteristic
Relative Humidity
Temperature
Measuring range
0... 100%
-20... +80
Resolution
0.1% RH
0.1°C
Accuracy
±3% RH
±0.5°C
Note:
When the sensor is external the temperature range is
-40… +120°C
Electrical specifications
Characteristic
Value
Supply voltage
8... 24 VDC
Power consumption
< 30 mA
General specifications
Characteristic
Value
External dimensions
45 x 65 x 28 (L x H x D)
Mounting
DIN Rail
2 screws Ø3 mm max.
Weight
About 60 g
Work area
10... 20 m
2
, with air circulation
Installation position
Horizontal or vertical
Working temperature
-20... 70°C
Ambient humidity
5... 95% (with no condensation)
Case material
PC + ABS
Serial communications
Characteristic
Value
Interface type
Isolated RS485
Voltage levels
According to EIA standard
Protocol type
MODBUS RTU
Byte format
8 bit with no parity
Stop bit
1 (one)
Baud rate
Programmable between 1200... 38400 baud
Address
Programmable between 1... 247
HOW TO ORDER
TRH-MINI
Relative Humidity and Temperature sensor.
RS485 COMMUNICATIONS
Code system
8 bit binary, hexadecimal 0... F, each word (8 bit) contains 2
hexadecimal characters.
Modbus RTU bits per byte in the protocol
1
Start bit;
8
Data bits (the less important bit must be sent as first);
-
No parity;
1
Stop bit.
Error detection domain
CRC-16 (Ciclic Redundacy Check), the lowest is in front, the
highest byte behind.
Communication speed
1200, 2400, 4800, 9600, 19200 baud per second.
The baud rate and the instrument address must be set using the
communications protocol.
