Service Update 1A
This update adds enhancements to SMS-3000/1500/1000 and PMX-1500/1000

Service Update 2
This update adds Modbus RTU communications. It is for the entire SMS 3000 software family, including SMS-3000, SMS-1500, SMS-1000, SMS-121, GFX-1000, PMX-1500, and PMX-1000 (Install Service Update 1A before Service Update 2)

Service Update 3
This update adds device support for Sepam protective relays. It is for the entire SMS 3000 software family, including SMS-3000, SMS-1500, SMS-1000, SMS-121, GFX-1000, PMX-1500, and PMX-1000. (Install Service Updates 1A and 2 before installing Service Update 3)

Service Update 4
This update adds the driver for Modbus/TCP Ethernet communications. It is for the entire SMS 3000 software family, including SMS-3000, SMS-1500, SMS-1000, SMS-121, GFX-1000, PMX-1500, and PMX-1000. (Install service Updates 1A and 2 before installing Service Update 4)