Request
Normal Response
Error Response
• A request starts with ENQ and ends with EOT.
• A normal response starts with ACK and ends with EOT.
• An error response starts with NAK and ends with EOT.
• A station ID indicates the inverter number and is displayed as a two-byte ASCII-
HEX string that uses characters 0–9 and A–F. ASCII-HEX is a hexadecimal
notation composed of numbers between 0–9 and letters between A–F.
• CMD: Uses uppercase characters (returns an IF error if lowercase characters are
encountered)—please refer to the following table.
Request monitor registration
Perform monitor registration
• Data will be displayed as ASCII-HEX. (For example, if data value is 3000: 3000 →
‘0’’B’’B’’8’h → 30h 42h 42h 38h).
• Error code: ASCII-HEX (refer to 7.3.1.4 Error Code on page 220)
• Transmission/reception buffer size: Transmission=39 bytes, Reception=44 bytes
• Monitor registration buffer: 8 Words
• SUM: Checks communication errors via sum.
SUM=a total of the lower 8 bits values for station ID, command and error code
(Station ID+CMD+error code) in ASCII-HEX.
For example, a read request to read 1 address from address 3000 is
SUM=‘0’+‘1’+’R’+‘3’+‘0’+‘0’+‘0’+’1’ = 30h+31h+52h+33h+30h+30h+30h+31h = 1
A7h. When calculating SUM, the control value like ENQ, ACK, and NAK are not
included. Since SUM takes a lower byte, A7h becomes SUM.
To Next Page
Loading...
Need help?
General
