socomec DELPHYS MX - JBUS;MODBUS Protocol Details; Protocol Mode and Functions; Frame Error Management

UPS/NTA GB/DMX-DMP JBUS.D Page 6 / 22
JBUS/MODBUS Protocol
Reminder:
The
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S protocol available on DELPHYS MX / MP is slave and in RTU mode.
It uses the function 3 as ‘read registers’ and the function 6 as ‘write register’.
The slave number is set via the control panel or via the graphic touch screen.
Conventions
The table addresses are written in hexadecimal, beginning with ‘0x’.
Some PLC systems request a relative address starting from 400 (0x0190) or 40001 (0x9C41), on this
address it’s necessary to add the first address of the
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S table.
Frame errors management:
In case of wrong data request, the UPS answers with the following frame error :
Error function code Error code Cause
80 + code function 1 Function error
80 + code function 2 Addresses error
80 + code function 3 Wrong data
80 + code function 6 busy
80 + code function 8 Write register error