T-solution SV-iG5 - Page 84

Chapter 5 - MODBUS-RTU Communication
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Negative Acknowledge Response
NAK Drive No. CMD Error Code SUM EOT
15h “01” ~ “1F” “X” “**” “XX” 04h
1 byte 2 bytes 1 byte 2 bytes 2 bytes 1 byte
Total byte = 9 bytes
Action Request for Monitor Registration: Request for read of address registered by monitor
registration.
ENQ Drive No. CMD SUM EOT
05h “01” ~ “1F” “Y” “XX” 04h
1 byte 2 bytes 1 byte 2 bytes 1 byte
Total byte = 7 bytes
Acknowledge Response
ACK
Drive
CMD Data SUM EOT
06h
“01” ~
“Y”
“XXXX
“XX” 04h
1 byte 2 bytes 1 byte
n * 4
2 bytes 1 byte
Total byte= 7 + n * 4 = max. 39 bytes
Negative Acknowledge Response
NAK
Drive
CMD
Error
SUM EOT
15h
“01” ~
“Y” “**” “XX” 04h
1 byte 2 bytes 1 byte 2 bytes 2 bytes 1 byte
Total byte = 9 bytes
Error Code
Error Code Description
SE Sum Error
FE Frame Error
FC Frame Error (Command): Not in use
FS Frame Error (Size)
EE Parameter EEP Access Error