User Manual HTS801
Humidity and Temperature Sensor for High Humidity and Chemically Polluted Conditions | 39
6.1.2. Simulation Mode
For the purpose of testing the measurement system, the RH and T output values can be fixed for a certain time.
All calculated humidity related physical quantities are then based on these two arbitrarily set values.
The Simulation Mode can be set up and started with the PCS10 Product Configuration Software or via Modbus
commands. The desired RH and T values have to entered. The duration for which the values are valid has to be
specified in seconds. Please also refer to chapter 6.3 Modbus RTU Example.
The Simulation Mode is available for all HTS801 models.
6.1.3.
Analogue outputs
Both analogue outputs shall be configured to either voltage or current. Measurands, analogue output range and
scaling are freely selectable. All settings can be performed using the PCS10 Product Configuration Software or
via display and push-buttons.
The analogue outputs feature an error indication function according to NAMUR NE43. In the case of an error the
output signal will freeze at 21 mA or 11 V respectively.
PLEASE NOTE
The error display is disabled by default.
The analogue outputs are both either current or voltage outputs. When changing one of the analogue outputs
from current to voltage and vice versa, the second output will change automatically to this output type. The
scaling changes automatically if it is out of physical range (i.e. 20 mA will be changed to 10 V instead of 20 V).
PLEASE NOTE
Check output scale after changing between voltage and current output.
6.2
RS485 Digital Interface
6.2.1.
Modbus RTU Setup
Factory settings
User selectable values (via PCS10)
Baud rate
9 600
9 600,.19 200,.38 400,.57 600,.76 800
Data bits
8
8
Parity
Even
None, odd, even
Stop bits
1
1, 2
Modbus address
230 (0xE6)
1...247
Tab. 5
Modbus RTU protocol settings
PLEASE NOTE
The.recommended.settings.for.multiple.devices.in.a.Modbus.RTU.network.are.9 600,.8,.even,.1.
Device address, baud rate, parity and stop bits can be set via:
▪.
PCS10 Product Configuration Software and the USB configuration cable HA010327.
The PCS10 can be downloaded free of charge from
.
▪.
Modbus protocol in the register 1 (0x00) and 2 (0x01).
See Application Note Modbus AN0103 (available at
).
The serial number as ASCII-code is located in read-only registers 1 - 8 (0x00 - 0x07, 16 bits per address).
The firmware version is located in register 9 (0x08) (bit 15...8 = major release; bit 7...0 = minor release).
The sensor name is located in registers 10 - 17 (16 bits per register).
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