USER MANUAL
SMALL-SIZE INFRARED GAS SENSOR MIPEX-02-3-RX-1.1 G
ESAT.100200.02.02 UM
September 23, 2021
Page 13 of 41
THE SOLE PROPERTY OF SIA MIPEX. ANY REPRODUCTION WITHOUT THE WRITTEN PERMISSION OF SIA MIPEX IS PROHIBITED.
5.4. Getting started
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During first 40 seconds after the power is up sensor does not return the
measured concentration value (the value is displayed as “-0001”, hex:
“8001”, “-0002”, hex:“8002”, “-0003”, hex:“8003”, see Table 13).
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When the measurement range is exceeded, concentration value is displayed
as “32767” (hex: “7FFF”).
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Sensor updates information about concentration every 1.28 ± 0.065 second.
Sending any command more often than one time per second (1 Hz) may
reduce sensor accuracy.
Switching on/off sensor is performed automatically upon feeding/disconnecting power supply.
After sensor is installed into end-user equipment check its status by sending <DATAE2>
command via UART interface:
•
for <DATAE2> command description see Appendix C.2.1;
•
for status bytes description and recommendations see Table 12.
Sensor span calibration and zeroing should be performed next. Methods of sensor span
calibration and zeroing are given in Appendix D.1.
5.5. Connecting multiple sensors to single UART line
It is possible to connect to single UART line up to 256 sensors assigning them net addresses
in range 00…FF. Sensor has net address 00 by default. To view and change its net address use the
following commands: <!**>, <NETON>, <NETOFF>, <%AABB>. For commands description see
Appendix C.2.5.
If sensor is used in combination with other devices on single UART line, any command text
must contain sensor’s address prefix as “#AA”, where AA stands for sensor’s net address in
hexadecimal format in range 00…FF. Thus, command text must be sent as <#AAX>, where X stands
for command text containing any number of characters in accordance with sensor communication
protocol (see Appendix C). Connection diagram of multiple sensors to single UART line is shown on
Fig. 6.