S&P AIRSENS CO2 Manual De Instrucciones página 12

Relay + Modbus (reading) – [SW1-4=OFF]
Green: Value below set point.
Red: Value above set point.
Other modes
Green: ≤ 800ppm / ≤ 60%HR
Orange: 800 – 1200ppm / 60 – 80%HR
Red: > 1200ppm / > 80%HR
Modbus registers
Operating modes MF1, MF2 and MF3 allow only reading Modbus communication.
It means access to all Modbus registers (see Fig.3) to visualize parameters. If
MF4 mode is selected, total control with visualization and modifi cation of param-
eters. Potentiometers P1 and P2 are disabled in MF4 mode.
In cases where a network communication net is made for multiple controls, it
will be necessary for all devices to remove jumper J9 (see Fig.1) except for the
last unit that will be kept (default from factory).
For visualization, modifi cation and control via Modbus it will be necessary to have
software suitable for this kind of communication. S&P will not provide specifi c
software for this purpose. The information provided on the Modbus registers al-
lows establishing a correct communication between AIRSENS CO2 / VOC / RH
and confi guration software chosen.
Basic connectivity features
Addressing: 1
Transmission speed: 19200
Parity: EVEN
Mode: RTU
Electrical interface: RS-485
Connector type: wiring D0 – D1 – Common
CALIBRATION / RESET
First time that device is switched on, or after a reset, a 10-minutes calibration
process is started during which measurements can be erroneous.
Manual way to start a reset process is disconnecting power supply, wait at least
30 seconds and power again the electronic control. It is also possible to do re-
motely via Modbus communication using General reset (register number 3).
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