What is difference between AC4490/AC4790 product part numbers that end with -01, -02, -03?

The -01, -02, -03 at the end of the part number signifies the version of firmware loaded to the module.
These firmware versions are Regionally significant and apply certified for the regions listed:

 

 

Part Number Certification Region
AC4490-1000M-01 FCC IC/North America
AC4490-1000M-02* RCM/C-Tick* Australia
AC4490LR-1000M-01 Long Range FCC/IC North America
AC4490LR-1000M-02* RCM/C-Tick* Australia*
AC4490LR-1000M-03 Anatel Brazil
AC4790-1000M-01 FCC/IC North America
AC4790-1000M-02* RCM/C-Tick* Australia*
AC4790LR-1000M-01 FCC/IC North America
AC4790LR-1000M-02* RCM/C-Tick* Australia*
CL4490-1000-232-01 (RS232) FCC/IC North America
CL4490-1000-232-03 (RS232) Anatel Brazil
CL4490-1000-232-SP-01 (RS232 - Starter Pack - Includes 2 units) FCC/IC North America
CL4490-1000-485-03 (RS485) Anatel Brazil
CL4490-1000-485-01 (RS485) FCC/IC North America
CL4490-1000-485-SP-01 (RS485 - Starter Pack - Includes 2 units) FCC/IC North America

*RMC/C-Tick Certified modules/ConnexLink must be purchased through Tekdis as they hold the certification.

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