4900002277 J22 TDLAS Gas Analyzer
48 SpectraSensors, Inc.
6 System Integration
Overview of Device
Description Files
Current version data for the device.
Modbus RS4852
Information
Function codes
Function codes are used to define which read or write action is carried out via the
Modbus protocol. The measuring device supports the following function codes:
Firmware version
01.00.zz • On the title page of the Operating instructions
• On the controller nameplate Firmware version
• Diagnostics → Device information → Firmware version
Release date of firmware
version
03.2021 - - -
Code Name Description Application
03 Read holding register Master reads one or more Modbus
registers from the device.
A maximum of 125 consecutive regis-
ters can be read with 1 telegram: 1
register = 2 bytes
The measuring device does
not make a distinction
between function codes 03
and 04; these codes therefore
yield the same result.
Read device parameters with
read and write access
04 Read input register Master reads one or more Modbus
registers from the device.
A maximum of 125 consecutive regis-
ters can be read with 1 telegram: 1
register = 2 bytes
The measuring device does
not make a distinction
between function codes 03
and 04; these codes therefore
yield the same result.
Read device parameters with
read access
06 Write single registers Master writes a new value to one
Modbus register of the measuring
device.
Use function code 16 to write
multiple registers with just 1
telegram.
Write only 1 device parame-
ter
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