Co2meter TX User manual

18 November 2019 Rev. H
TX Sensor Controller
Manual
Revision H
REVISION 2
REVISION 3

TX Rev. HCopyright © 2019 CO2Meter,Inc.
ii
The information in this document is protected under applicable federal law as
an unpublished work and is confidential and proprietary to CO2Meter.com.Its
use, disclosure, reproduction, orpublication, in whole or in part, without the
express prior written consent of CO2Meter.com.is prohibited.
© 2019 CO2Meter.com.All Rights Reserved.
Document History
Date
Revision
Description
30 November 2018
Draft A
Initial Draft
1 December 2018
Draft A
Revised Draft
2 December 2018
Draft A
Added Appendix
15 December 2018
Rev. A
Firmware 1 build 0, clarification and
detail; HR, IR and CMD
1 February 2019
Rev. B
Firmware 1.10 beta Hardware
version 3.0:
Addition of GSS CO2
capability. Dual use IR 2-5 and 16 -
20. Sensor restore type table.
Commands 34, 40, 4. Support GSS
CO2 sensors to 20Hz via Modbus
12 February 2019
Rev. C
Firmware 1.20 beta. Add limiter for
20 mA out, < = register 23 value. Test
value register 19 limited < = register
19 prevent overrange out on miss
configuration.
19 February 2019
Rev. C
Firmware 1.20 reference to
CO2Meter and GasBox
development tools. Confirm CO2/
O2 version hardware 1.0, 2.0 and
3.0 compatible with firmware 1.2.
6 March 2019
Rev. D
Added Appendix with Revision
History. Moved Version 1.1 Notes to
Revision History. Added Version 1.2
Revision
8 March 2019
Rev. E
Firmware 1.20. Grammatical
corrections, technical clarifications.
11 March 2012
Rev.F
Firmware 1.20 clarity execution of
Commands.

TX Rev. HCopyright © 2019 CO2Meter,Inc.
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10 June 2019
Rev. G
Hardware REV3 release. Firmware
1.20. additional detail for
compatibility w/ MX series.
Elaboration in register definitions.
Fix annotation of RS485 AB swapped.
18November 2019Rev.HTX Manual Changes for both O2/
CO2

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Table of Contents
INTRODUCTION........................................................................................................................................ 1
ABOUT THIS MANUAL..............................................................................................................................................1
SOFTWARE VERSION................................................................................................................................................1
CHAPTER 1 : OVERVIEW........................................................................................................................ 2
GENERAL....................................................................................................................................................................2
MEASUREMENTS ......................................................................................................................................................2
CHAPTER 2 : COMMUNICATIONS INTERFACE................................................................................3
GENERAL....................................................................................................................................................................3
PHYSICAL CONNECTIONS ........................................................................................................................................3
CONNECTOR ASSIGNMENTS....................................................................................................................................3
SENSOR CONNECTIONS............................................................................................................................................4
CHAPTER 3 : REGISTERS ....................................................................................................................... 5
INPUT REGISTERS.....................................................................................................................................................5
INPUT REGISTER DESCRIPTIONS ...........................................................................................................................6
IR30001 (Address 0) Busy/Error Status...................................................................................................... 6
IR30003 (Address 2) O2/ CO2 Concentration........................................................................................... 7
IR30004 (Address 3) Partial Pressure O2 ................................................................................................... 7
IR30005 (Address 4) Temperature ................................................................................................................ 7
IR30006 (Address 5) Pressure.......................................................................................................................... 7
IR30007 (Address 6) Error Status.................................................................................................................. 7
IR30008 (Address 7) Manufacturer Id ......................................................................................................... 7
IR30009 (Address 8) Model Number............................................................................................................. 7
IR30010 (Address 9) Firmware Version ...................................................................................................... 7
IR30011 (Address 10) Serial Number........................................................................................................... 7
IR30012 (Address 11) PDU Count .................................................................................................................. 7
HOLDING REGISTERS ...............................................................................................................................................7
HOLDING REGISTER DESCRIPTIONS......................................................................................................................9
HR40001 (Address 0) Checksum..................................................................................................................... 9
HR40007 (Address 6) Gas Type ....................................................................................................................... 9
Gas type preset table............................................................................................................................................. 9
HR40016 ADR 15 Modbus Address. ............................................................................................................... 9
HR40017 ADR 16 Comm configuration (stop and parity) ................................................................10
HR00020 ADR 19 Current loop test.............................................................................................................10
CHAPTER 4 DEVICE COMMANDS..................................................................................................... 11
GENERAL................................................................................................................................................................. 11
COMMAND AND PARAMETER REGISTERS ..........................................................................................................11
COMMAND BUSY.................................................................................................................................................... 11
COMMAND EXECUTION ........................................................................................................................................ 11
COMMAND DESCRIPTIONS ................................................................................................................................... 11
Device Command 1 (0x0001) Error Reset ................................................................................................11
Device Command 2 (0x0002) Factory Use................................................................................................12
Device Command 16 (0x0010) Save Holding Registers to Flash....................................................12
Device Command 17 (0x0011) Restore Factory Presets ....................................................................12
Device Command 32 (0x0020) Zero Calibration ...................................................................................12
Device Command 33 (0x0021) Calibrate to Span.................................................................................
12

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Device Command 34 (0x0022) calibrate to 400 ppm CO2................................................................12
Device Command 40 (0x0028) suspend streaming ..............................................................................12
Device Command 41 (0x0029) resume streaming................................................................................12
Device Command 9985 (0x2701) Factory Use........................................................................................12
CHAPTER 5 : TESTING ......................................................................................................................... 13
MODBUS TOOL....................................................................................................................................................... 13
SERIAL PORT.......................................................................................................................................................... 13
CABLE CONNECTIONS...........................................................................................................................................13
POWER CONNECTIONS ......................................................................................................................................... 14
CONFIGURING MODBUS TOOL............................................................................................................................. 14
USING THE MODBUS TOOL .................................................................................................................................. 14
COMMUNICATION LOG.......................................................................................................................................... 14
READING HOLDING REGISTERS .......................................................................................................................... 15
READING INPUT REGISTERS ................................................................................................................................ 15
WRITING HOLDING REGISTERS .......................................................................................................................... 15
CHAPTER 6 CO2Meter GRAPHICAL CONFIGURATION AND RAPID DEPLOYMENT TOOL 18
CHAPTER 7 FIRMWARE UPDATES.................................................................................................. 20
GENERAL................................................................................................................................................................. 20
PROGRAMMING CONFIGURATION....................................................................................................................... 20
Processor ..................................................................................................................................................................20
Programming Interface.....................................................................................................................................20
Programming Voltage........................................................................................................................................20
Device Power ..........................................................................................................................................................20
Connections.............................................................................................................................................................20
PROGRAMMING DEVICE ....................................................................................................................................... 20
PROGRAMMING SOFTWARE................................................................................................................................. 22
FIRMWARE FILES .................................................................................................................................................. 22
PROGRAMMING PROCEDURE............................................................................................................................... 22
CONNECT TO DEVICE ............................................................................................................................................23
DEVICE ERASE ....................................................................................................................................................... 24
PROGRAMMING FIRMWARE................................................................................................................................. 24
CHAPTER 8 : SUPPORT ....................................................................................................................... 26
WARRANTY ............................................................................................................................................................ 26
LIABILITY................................................................................................................................................................ 26
RETURNS.................................................................................................................................................................26
CONTACT US.......................................................................................................................................................... 27
CHAPTER 9 : APPENDIX 1: REVISION HISTORY ......................................................................... 28
VERSION 1.1 REVISIONS:..................................................................................................................................... 28
VERSION 1.2 REVISIONS:..................................................................................................................................... 29
Table of Figures
Figure 2-1 TX Sensor Controller.....................................................................................................3
Figure 2-2 Sensor controller sensor mount side ........................................................................4
Figure 5-1 Holding Registers........................................................................................................... 16
Figure 5-2 Input Registers................................................................................................................ 17

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Figure 7-1 Programming Connections ........................................................................................ 21
Figure 7-2 ST-LINK/V2 Connections............................................................................................ 21
Figure 7-3 Initial Screen.................................................................................................................... 23
Figure 7-4 Screen After Connection.............................................................................................. 24
Figure 7-5 Erase and Programming Screen............................................................................... 25

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Introduction
About this Manual
This document is a technical reference for the CO2Meter.com TX Sensor Controller.
It provides the information necessary to use the sensor controller as well as
information about configuring the controller for various applications. The sensor
current supports the SST Luminox O2sensors and the GSS CO2 MINIR sensors.
Software Version
This manual applies to Software Version 1.2 beta 2/12/2019

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Chapter 1 : Overview
General
The TX Sensor Controller is a high-performance controller supporting various types ofgas
sensor modules. Thecontroller supplies an RS485 Modbus RTU interface to the host
system and a separate UART interface to the gas sensor module. The controller accepts a
wide range (6 to 24Volt) power supply and provides a 4-20mA 3-wire current output. The
controller is 24 volt and provides RS485 and 4-20 mA connection, used in a variety of
industrial applications. The O2 Transmitter is UV and has zero cross to any of the
mentioned gases.
Measurements
The TX receives continuous measurements streamed from the sensor, typically twice per
second. The controller performs various computations at each measurement, including
adjusting the raw controller reading to the field calibrated values. The measurements are
made available to a host system through the Modbus interface. The primary gas sensor
reading is made available as a 4-20ma current output, 24 volt and RS485 for industrial
applications and many other industries.

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Chapter 2 : Communications Interface
General
The TX communicates with a host system through an RS485 Modbus RTU interface. This
interface allows many slave devices to be connected to a host controller over a single
twisted cable. A common ground reference is normally required. For long lines, the
twisted-pair should be terminated with a 120-ohm resistor at each end.
Physical Connections
The TX uses a 6 pin (2x3) header with 0.1-inch (2.54 mm) centers. In some cases, the
header is not populated, and appropriate wire terminals are soldered directly to the
header pads.
Connector Assignments
Pin
Function
Pin
Function
1
4-20 mA current output
2
Reserved
3
GND
4
RS485 A (Data -)
5
DC Power (+6 – 24V)
6
RS485 B (Data +)
Figure 2-1 TX Sensor Controller
The DC Power and GND connections are protected against reverse polarity. The RS485
Data lines are protected against high voltage transients. The 4-20 mA output pin is also
protected against transient voltages. There is no protection on reserved Pin 2 which
connects directly to the microcontroller.
WARNING: Use care when connecting DC power. While the DC power and
Ground connections are protected against reverse polarity, all other pins on
the connector will be damaged if DC voltages > 5 V are continuously applied.
Pin 1
Pin 5
REVISION 2
REVISION 3
Pin 1
Pin 5

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Sensor Connections
The Luminox sensor is installed centered on the solder side of the TX PCB. The sensor is
normally soldered to the board. 5Vpower is supplied to the sensor from a switching power
supply.
Figure 2-2 Sensor controller sensor mount side
REVISION 2
REVISION 3