USER MANUAL
SMALL-SIZE INFRARED GAS SENSOR MIPEX-02-3-RX-1.1 G
ESAT.100200.02.02 UM
September 23, 2021
Page 24 of 41
THE SOLE PROPERTY OF SIA MIPEX. ANY REPRODUCTION WITHOUT THE WRITTEN PERMISSION OF SIA MIPEX IS PROHIBITED.
APPENDIX C. UART COMMUNICATION PROTOCOL
Current manual describes firmware releases 25.8. Sensor communication protocol is based
on UART interface. Sensor firmware could be updated or downgraded. Contact support for available
compatible versions and instructions.
Appendix C.1. General information
Data exchange with MIPEX-02 sensors is performed via UART interface:
•
Sensor has symbol rate of 9600 baud.
•
Data format: 8-bit message, 1 stop bit, no parity checking.
•
Electrical parameters of UART are pointed in section 5.3.
General command format:
•
any command stated in this UM as <X>, where X stands for a command text consisted of
any number of characters, must be read and/or sent without the symbols “<” and “>”;
•
ASCII code for commands and most responses;
•
command ends with carriage return symbol (hex: “0D”);
•
words and/or values in a response on most commands are separated by space symbol
(hex: “20”) or in some cases by tabulation (hex: “09”);
•
all symbols in command must be sent as one word without delays;
•
sensor does not respond to incorrectly sent commands;
•
sensor has two operating modes (access levels): “OEM” and “USER”; “OEM” has
extended command set for developers, while “USER” mode is used for field operations;
•
if sensor is used in combination with other devices on single UART line, then to refer to a
specific sensor, before any command from the communication protocol must write prefix
as “#XX”, where XX stands for sensor’s net address in hexadecimal format in range
00…FF. The assignment of the net address to the sensor is described in chapter 5.5.
Example of writing the command #XXINDSIG ON and responding to this command
#XXINDSIG ON OK.
When accessing the sensor using commands from the communication
protocol for writing / rewriting data into the sensor's memory, do not turn
off the sensor power supply within 2 seconds after the submission of the
corresponding commands from the communication protocol.